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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Allowance for loan losses:          
Balance at beginning of period     $ 31,043    
Loan and lease loss provision $ 100 $ 422 749 $ 342  
Balance at end of period 31,818   31,818    
Loans receivable:          
Total Loans and leases receivable 4,542,126   4,542,126   $ 4,304,458
Non-PCI Loans and Leases [Member]          
Allowance for loan losses:          
Balance at beginning of period 31,777 33,152 31,043 32,429  
Charge-offs (657) (665) (2,289) (851)  
Recoveries on loans and leases previously charged off 598 849 2,315 1,838  
Loan and lease loss provision 100 422 749 342  
Balance at end of period 31,818 33,758 31,818 33,758  
Ending balance: individually evaluated for impairment 3,977 5,479 3,977 5,479  
Ending balance: collectively evaluated for impairment 27,841 28,279 27,841 28,279  
Loans receivable:          
Total Loans and leases receivable 4,542,126 4,073,062 4,542,126 4,073,062 $ 4,304,458
Individually evaluated for impairment 26,939 26,194 26,939 26,194  
Collectively evaluated for impairment 4,515,187 4,046,868 4,515,187 4,046,868  
Non-PCI Loans and Leases [Member] | Real estate loans [Member]          
Allowance for loan losses:          
Balance at beginning of period 17,640 25,602 17,012 26,134  
Charge-offs (40) (38) (1,029) (142)  
Recoveries on loans and leases previously charged off 371 447 1,256 1,159  
Loan and lease loss provision (55) (2,578) 677 (3,718)  
Balance at end of period 17,916 23,433 17,916 23,433  
Ending balance: individually evaluated for impairment 1,540 3,638 1,540 3,638  
Ending balance: collectively evaluated for impairment 16,376 19,795 16,376 19,795  
Loans receivable:          
Total Loans and leases receivable 3,781,209 3,451,025 3,781,209 3,451,025  
Individually evaluated for impairment 18,261 19,695 18,261 19,695  
Collectively evaluated for impairment 3,762,948 3,431,330 3,762,948 3,431,330  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member]          
Allowance for loan losses:          
Balance at beginning of period 6,890 5,955 7,400 5,623  
Charge-offs (86) 0 (365) (40)  
Recoveries on loans and leases previously charged off 197 367 933 644  
Loan and lease loss provision 119 698 (848) 793  
Balance at end of period 7,120 7,020 7,120 7,020  
Ending balance: individually evaluated for impairment 578 1,841 578 1,841  
Ending balance: collectively evaluated for impairment 6,542 5,179 6,542 5,179  
Loans receivable:          
Total Loans and leases receivable 396,522 347,236 396,522 347,236  
Individually evaluated for impairment 3,000 5,275 3,000 5,275  
Collectively evaluated for impairment 393,522 341,961 393,522 341,961  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member]          
Allowance for loan losses:          
Balance at beginning of period 7,110 980 6,279 307  
Charge-offs (531) (627) (895) (669)  
Recoveries on loans and leases previously charged off 29 20 124 20  
Loan and lease loss provision 41 1,660 1,141 2,375  
Balance at end of period 6,649 2,033 6,649 2,033  
Ending balance: individually evaluated for impairment 1,859 0 1,859 0  
Ending balance: collectively evaluated for impairment 4,790 2,033 4,790 2,033  
Loans receivable:          
Total Loans and leases receivable 350,578 257,525 350,578 257,525  
Individually evaluated for impairment 4,801 0 4,801 0  
Collectively evaluated for impairment 345,777 257,525 345,777 257,525  
Non-PCI Loans and Leases [Member] | Consumer loans [Member]          
Allowance for loan losses:          
Balance at beginning of period 125 130 122 199  
Charge-offs 0 0 0 0  
Recoveries on loans and leases previously charged off 1 15 2 15  
Loan and lease loss provision (17) (50) (15) (119)  
Balance at end of period 109 95 109 95  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 109 95 109 95  
Loans receivable:          
Total Loans and leases receivable 13,817 17,276 13,817 17,276  
Individually evaluated for impairment 877 1,224 877 1,224  
Collectively evaluated for impairment 12,940 16,052 12,940 16,052  
Non-PCI Loans and Leases [Member] | Unallocated [Member]          
Allowance for loan losses:          
Balance at beginning of period 12 485 230 166  
Charge-offs 0 0 0 0  
Recoveries on loans and leases previously charged off 0 0 0 0  
Loan and lease loss provision 12 692 (206) 1,011  
Balance at end of period 24 1,177 24 1,177  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 24 1,177 24 1,177  
Loans receivable:          
Total Loans and leases receivable 0 0 0 0  
Individually evaluated for impairment 0 0 0 0  
Collectively evaluated for impairment $ 0 $ 0 $ 0 $ 0