Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Allowance for Loan and Lease Losses by Portfolio Segment (Detail)

v3.8.0.1
Loans and Leases - Allowance for Loan and Lease Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for loan losses:                      
Balance at beginning of period       $ 32,429         $ 32,429    
Loan and lease loss provision (income) $ 220 $ 269 $ 422 (80) $ 151 $ (1,450) $ (1,515) $ (1,525) 831 $ (4,339) $ (11,614)
Balance at end of period 31,043       32,429       31,043 32,429  
Loans receivable:                      
Balance at end of period 4,304,458       3,844,769       4,304,458 3,844,769  
PCI Loans [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       971       5,441 971 5,441  
Charge-offs                   (5,133)  
Loan and lease loss provision (income)                 (651) 663  
Balance at end of period 320       971       320 971 5,441
Loans receivable:                      
Balance at end of period 7,748       9,863       7,748 9,863  
PCI Loans [Member] | Real estate loans [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       922       5,397 922 5,397  
Charge-offs                   (5,133)  
Loan and lease loss provision (income)                 (663) 658  
Balance at end of period 259       922       259 922 5,397
Loans receivable:                      
Balance at end of period 7,659       9,677       7,659 9,677  
PCI Loans [Member] | Commercial and industrial loans[Member]                      
Allowance for loan losses:                      
Balance at beginning of period       41       42 41 42  
Charge-offs                   0  
Loan and lease loss provision (income)                 0 (1)  
Balance at end of period 41       41       41 41 42
Loans receivable:                      
Balance at end of period 49       136       49 136  
PCI Loans [Member] | Leases Receivable [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       0       0 0 0  
Charge-offs                   0  
Loan and lease loss provision (income)                 0 0  
Balance at end of period 0       0       0 0 0
Loans receivable:                      
Balance at end of period 0       0       0 0  
PCI Loans [Member] | Consumer loans [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       8       2 8 2  
Charge-offs                   0  
Loan and lease loss provision (income)                 12 6  
Balance at end of period 20       8       20 8 2
Loans receivable:                      
Balance at end of period 40       50       40 50  
PCI Loans [Member] | Unallocated [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       0       0 0 0  
Charge-offs                   0  
Loan and lease loss provision (income)                 0 0  
Balance at end of period 0       0       0 0 0
Loans receivable:                      
Balance at end of period 0       0       0 0  
Non-PCI Loans [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       31,458       37,494 31,458 37,494  
Charge-offs                 (5,899) (3,736)  
Recoveries on loans and leases previously charged off                 3,682 2,702  
Loan and lease loss provision (income)                 1,482 (5,002)  
Balance at end of period 30,723       31,458       30,723 31,458 37,494
Ending balance: individually evaluated for impairment 5,878       4,327       5,878 4,327  
Ending balance: collectively evaluated for impairment 24,845       27,131       24,845 27,131  
Loans receivable:                      
Ending balance: individually evaluated for impairment 27,184       26,350       27,184 26,350  
Ending balance: collectively evaluated for impairment 4,269,526       3,808,556       4,269,526 3,808,556  
Balance at end of period 4,296,710       3,834,906       4,296,710 3,834,906  
Non-PCI Loans [Member] | Real estate loans [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       25,212       29,800 25,212 29,800  
Charge-offs                 (2,150) (3,022)  
Recoveries on loans and leases previously charged off                 1,527 667  
Loan and lease loss provision (income)                 (7,836) (2,233)  
Balance at end of period 16,753       25,212       16,753 25,212 29,800
Ending balance: individually evaluated for impairment 2,093       3,980       2,093 3,980  
Ending balance: collectively evaluated for impairment 14,660       21,232       14,660 21,232  
Loans receivable:                      
Ending balance: individually evaluated for impairment 18,663       21,757       18,663 21,757  
Ending balance: collectively evaluated for impairment 3,564,592       3,246,941       3,564,592 3,246,941  
Balance at end of period 3,583,255       3,268,698       3,583,255 3,268,698  
Non-PCI Loans [Member] | Commercial and industrial loans[Member]                      
Allowance for loan losses:                      
Balance at beginning of period       5,582       7,081 5,582 7,081  
Charge-offs                 (2,516) (706)  
Recoveries on loans and leases previously charged off                 1,901 1,978  
Loan and lease loss provision (income)                 2,392 (2,771)  
Balance at end of period 7,359       5,582       7,359 5,582 7,081
Ending balance: individually evaluated for impairment 441       347       441 347  
Ending balance: collectively evaluated for impairment 6,918       5,235       6,918 5,235  
Loans receivable:                      
Ending balance: individually evaluated for impairment 3,040       4,174       3,040 4,174  
Ending balance: collectively evaluated for impairment 396,112       295,910       396,112 295,910  
Balance at end of period 399,152       300,084       399,152 300,084  
Non-PCI Loans [Member] | Leases Receivable [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       307       0 307 0  
Charge-offs                 (1,233) (6)  
Recoveries on loans and leases previously charged off                 239 1  
Loan and lease loss provision (income)                 6,966 312  
Balance at end of period 6,279       307       6,279 307 0
Ending balance: individually evaluated for impairment 3,334       0       3,334 0  
Ending balance: collectively evaluated for impairment 2,945       307       2,945 307  
Loans receivable:                      
Ending balance: individually evaluated for impairment 4,452       0       4,452 0  
Ending balance: collectively evaluated for impairment 292,832       243,294       292,832 243,294  
Balance at end of period 297,284       243,294       297,284 243,294  
Non-PCI Loans [Member] | Consumer loans [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       191       242 191 242  
Charge-offs                 0 (2)  
Recoveries on loans and leases previously charged off                 15 56  
Loan and lease loss provision (income)                 (104) (105)  
Balance at end of period 102       191       102 191 242
Ending balance: individually evaluated for impairment 10       0       10 0  
Ending balance: collectively evaluated for impairment 92       191       92 191  
Loans receivable:                      
Ending balance: individually evaluated for impairment 1,029       419       1,029 419  
Ending balance: collectively evaluated for impairment 15,990       22,411       15,990 22,411  
Balance at end of period 17,019       22,830       17,019 22,830  
Non-PCI Loans [Member] | Unallocated [Member]                      
Allowance for loan losses:                      
Balance at beginning of period       $ 166       $ 371 166 371  
Charge-offs                 0 0  
Recoveries on loans and leases previously charged off                 0 0  
Loan and lease loss provision (income)                 64 (205)  
Balance at end of period 230       166       230 166 $ 371
Ending balance: individually evaluated for impairment 0       0       0 0  
Ending balance: collectively evaluated for impairment 230       166       230 166  
Loans receivable:                      
Ending balance: individually evaluated for impairment 0       0       0 0  
Ending balance: collectively evaluated for impairment 0       0       0 0  
Balance at end of period $ 0       $ 0       $ 0 $ 0