Quarterly report pursuant to Section 13 or 15(d)

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

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Loans and Leases - Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Allowance for loan losses:      
Balance at beginning of period $ 32,429    
Loan and lease loss provision (income) (80) $ (1,525)  
Balance at end of period 33,152    
Loans receivable:      
Total Loans and leases receivable 3,943,951   $ 3,844,769
Non-PCI Loans and Leases [Member]      
Allowance for loan losses:      
Balance at beginning of period 31,458 37,494  
Charge-offs (186) (637)  
Recoveries on loans and leases previously charged off 989 253  
Loan and lease loss provision (income) 0 (1,729)  
Balance at end of period 32,261 35,381  
Ending balance: individually evaluated for impairment 4,547 4,093  
Ending balance: collectively evaluated for impairment 27,714 31,288  
Loans receivable:      
Total Loans and leases receivable 3,934,991 3,286,644 3,834,906
Ending balance: individually evaluated for impairment 24,944 32,736  
Ending balance: collectively evaluated for impairment 3,910,047 3,253,908  
Non-PCI Loans and Leases [Member] | Real estate loans [Member]      
Allowance for loan losses:      
Balance at beginning of period 25,212 29,800  
Charge-offs (104) (535)  
Recoveries on loans and leases previously charged off 712 93  
Loan and lease loss provision (income) (1,060) (1,080)  
Balance at end of period 24,760 28,278  
Ending balance: individually evaluated for impairment 3,756 3,334  
Ending balance: collectively evaluated for impairment 21,004 24,944  
Loans receivable:      
Total Loans and leases receivable 3,340,085 2,966,390  
Ending balance: individually evaluated for impairment 20,795 25,595  
Ending balance: collectively evaluated for impairment 3,319,290 2,940,795  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member]      
Allowance for loan losses:      
Balance at beginning of period 5,582 7,081  
Charge-offs (40) (102)  
Recoveries on loans and leases previously charged off 277 160  
Loan and lease loss provision (income) 95 (850)  
Balance at end of period 5,914 6,289  
Ending balance: individually evaluated for impairment 791 759  
Ending balance: collectively evaluated for impairment 5,123 5,530  
Loans receivable:      
Total Loans and leases receivable 317,562 295,471  
Ending balance: individually evaluated for impairment 3,828 6,441  
Ending balance: collectively evaluated for impairment 313,734 289,030  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member]      
Allowance for loan losses:      
Balance at beginning of period 307 0  
Charge-offs (42) 0  
Recoveries on loans and leases previously charged off 0 0  
Loan and lease loss provision (income) 715 0  
Balance at end of period 980 0  
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment 980 0  
Loans receivable:      
Total Loans and leases receivable 259,591 0  
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment 259,591 0  
Non-PCI Loans and Leases [Member] | Consumer loans [Member]      
Allowance for loan losses:      
Balance at beginning of period 191 242  
Charge-offs 0 0  
Recoveries on loans and leases previously charged off 0 0  
Loan and lease loss provision (income) (69) 13  
Balance at end of period 122 255  
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment 122 255  
Loans receivable:      
Total Loans and leases receivable 17,753 24,783  
Ending balance: individually evaluated for impairment 321 700  
Ending balance: collectively evaluated for impairment 17,432 24,083  
Non-PCI Loans and Leases [Member] | Unallocated [Member]      
Allowance for loan losses:      
Balance at beginning of period 166 371  
Charge-offs 0 0  
Recoveries on loans and leases previously charged off 0 0  
Loan and lease loss provision (income) 319 188  
Balance at end of period 485 559  
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment 485 559  
Loans receivable:      
Total Loans and leases receivable 0 0  
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment 0 0  
PCI Loans and Leases [Member]      
Allowance for loan losses:      
Balance at beginning of period 971 5,441  
Charge-offs 0    
Loan and lease loss provision (income) (80) 204  
Balance at end of period 891 5,645  
Loans receivable:      
Total Loans and leases receivable 8,960 19,835 $ 9,863
PCI Loans and Leases [Member] | Real estate loans [Member]      
Allowance for loan losses:      
Balance at beginning of period 922 5,397  
Charge-offs 0    
Loan and lease loss provision (income) (80) 202  
Balance at end of period 842 5,599  
Loans receivable:      
Total Loans and leases receivable 8,790 19,625  
PCI Loans and Leases [Member] | Commercial and industrial loans [Member]      
Allowance for loan losses:      
Balance at beginning of period 41 42  
Charge-offs 0    
Loan and lease loss provision (income) 0 2  
Balance at end of period 41 44  
Loans receivable:      
Total Loans and leases receivable 120 161  
PCI Loans and Leases [Member] | Leases Receivable [Member]      
Allowance for loan losses:      
Balance at beginning of period 0 0  
Charge-offs 0    
Loan and lease loss provision (income) 0 0  
Balance at end of period 0 0  
Loans receivable:      
Total Loans and leases receivable 0 0  
PCI Loans and Leases [Member] | Consumer loans [Member]      
Allowance for loan losses:      
Balance at beginning of period 8 2  
Charge-offs 0    
Loan and lease loss provision (income) 0 0  
Balance at end of period 8 2  
Loans receivable:      
Total Loans and leases receivable 50 49  
PCI Loans and Leases [Member] | Unallocated [Member]      
Allowance for loan losses:      
Balance at beginning of period 0 0  
Charge-offs 0    
Loan and lease loss provision (income) 0 0  
Balance at end of period 0 0  
Loans receivable:      
Total Loans and leases receivable $ 0 $ 0