Annual report pursuant to Section 13 and 15(d)

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

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Loans and Leases - Allowance for Loan and Lease Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for loan losses on loans and leases:                      
Balance at beginning of period       $ 31,043         $ 31,043    
Loan and lease loss provision (income) $ 3,041 $ 200 $ 100 649 $ 220 $ 269 $ 422 $ (80) 3,990 $ 831 $ (4,339)
Balance at end of period 31,974       31,043       31,974 31,043  
Loans and leases receivable:                      
Total loans and Leases 4,600,540       4,304,458       4,600,540 4,304,458  
Non-PCI Loans                      
Allowance for loan losses on loans and leases:                      
Balance at beginning of period       31,043       32,429 31,043 32,429  
Charge-offs                 (7,310) (5,899)  
Recoveries on loans and leases previously charged off                 4,251 3,682  
Loan and lease loss provision (income)                 3,990 831  
Balance at end of period 31,974       31,043       31,974 31,043 32,429
Individually evaluated for impairment 1,812       5,878       1,812 5,878  
Collectively evaluated for impairment 30,162       25,165       30,162 25,165  
Loans and leases receivable:                      
Total loans and Leases 4,600,540       4,304,458       4,600,540 4,304,458  
Individually evaluated for impairment 25,125       27,184       25,125 27,184  
Collectively evaluated for impairment 4,575,415       4,277,274       4,575,415 4,277,274  
Non-PCI Loans | Real estate loans                      
Allowance for loan losses on loans and leases:                      
Balance at beginning of period       17,012       26,134 17,012 26,134  
Charge-offs                 (3,897) (2,150)  
Recoveries on loans and leases previously charged off                 2,512 1,527  
Loan and lease loss provision (income)                 2,757 (8,499)  
Balance at end of period 18,384       17,012       18,384 17,012 26,134
Individually evaluated for impairment 1       2,093       1 2,093  
Collectively evaluated for impairment 18,383       14,919       18,383 14,919  
Loans and leases receivable:                      
Total loans and Leases 3,758,355       3,590,914       3,758,355 3,590,914  
Individually evaluated for impairment 14,761       18,663       14,761 18,663  
Collectively evaluated for impairment 3,743,594       3,572,251       3,743,594 3,572,251  
Non-PCI Loans | Commercial and industrial loans                      
Allowance for loan losses on loans and leases:                      
Balance at beginning of period       7,400       5,623 7,400 5,623  
Charge-offs                 (815) (2,516)  
Recoveries on loans and leases previously charged off                 1,369 1,901  
Loan and lease loss provision (income)                 (792) 2,392  
Balance at end of period 7,162       7,400       7,162 7,400 5,623
Individually evaluated for impairment 428       441       428 441  
Collectively evaluated for impairment 6,734       6,959       6,734 6,959  
Loans and leases receivable:                      
Total loans and Leases 429,903       399,201       429,903 399,201  
Individually evaluated for impairment 4,396       3,040       4,396 3,040  
Collectively evaluated for impairment 425,507       396,161       425,507 396,161  
Non-PCI Loans | Leases receivable                      
Allowance for loan losses on loans and leases:                      
Balance at beginning of period       6,279       307 6,279 307  
Charge-offs                 (2,598) (1,233)  
Recoveries on loans and leases previously charged off                 368 239  
Loan and lease loss provision (income)                 2,254 6,966  
Balance at end of period 6,303       6,279       6,303 6,279 307
Individually evaluated for impairment 1,383       3,334       1,383 3,334  
Collectively evaluated for impairment 4,920       2,945       4,920 2,945  
Loans and leases receivable:                      
Total loans and Leases 398,858       297,284       398,858 297,284  
Individually evaluated for impairment 5,129       4,452       5,129 4,452  
Collectively evaluated for impairment 393,729       292,832       393,729 292,832  
Non-PCI Loans | Consumer loans                      
Allowance for loan losses on loans and leases:                      
Balance at beginning of period       122       199 122 199  
Charge-offs                 0 0  
Recoveries on loans and leases previously charged off                 2 15  
Loan and lease loss provision (income)                 (26) (92)  
Balance at end of period 98       122       98 122 199
Individually evaluated for impairment 0       10       0 10  
Collectively evaluated for impairment 98       112       98 112  
Loans and leases receivable:                      
Total loans and Leases 13,424       17,059       13,424 17,059  
Individually evaluated for impairment 839       1,029       839 1,029  
Collectively evaluated for impairment 12,585       16,030       12,585 16,030  
Non-PCI Loans | Unallocated                      
Allowance for loan losses on loans and leases:                      
Balance at beginning of period       $ 230       $ 166 230 166  
Charge-offs                 0 0  
Recoveries on loans and leases previously charged off                 0 0  
Loan and lease loss provision (income)                 (203) 64  
Balance at end of period 27       230       27 230 $ 166
Individually evaluated for impairment 0       0       0 0  
Collectively evaluated for impairment 27       230       27 230  
Loans and leases receivable:                      
Total loans and Leases 0       0       0 0  
Individually evaluated for impairment 0       0       0 0  
Collectively evaluated for impairment $ 0       $ 0       $ 0 $ 0