Quarterly report pursuant to Section 13 or 15(d)

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

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Loans - Allowance for Loan Losses by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Allowance for loan losses:        
Balance at beginning of period $ 51,886 $ 59,876 $ 57,555 $ 63,305
Charge-offs (1,418) (4,610) (5,569) (11,124)
Recoveries on loans previously charged off 663 2,383 6,656 4,964
Provision (negative provision) 48 (10) (7,463) 494
Balance at end of period 51,179 57,639 51,179 57,639
Loans receivable:        
Balance at end of period 2,675,959 2,159,271 2,675,959 2,159,271
Allowance for Loans and Leases Receivable [Member]
        
Loans receivable:        
Ending balance: individually evaluated for impairment 5,784 2,369 5,784 2,369
Ending balance: collectively evaluated for impairment 45,395 55,270 45,395 55,270
Loans [Member]
        
Loans receivable:        
Ending balance: individually evaluated for impairment 49,382 43,466 49,382 43,466
Ending balance: collectively evaluated for impairment 2,559,553 2,115,805 2,559,553 2,115,805
Ending balance: acquired with deteriorated credit quality 67,024   67,024  
Real estate loans [Member]
        
Allowance for loan losses:        
Balance at beginning of period 40,303 46,396 43,550 49,472
Charge-offs (884) (1,017) (2,073) (4,592)
Recoveries on loans previously charged off 293 1,641 3,298 2,923
Provision (negative provision) 179 (1,795) (4,884) (2,578)
Balance at end of period 39,891 45,225 39,891 45,225
Loans receivable:        
Balance at end of period 2,411,154 1,921,659 2,411,154 1,921,659
Real estate loans [Member] | Allowance for Loans and Leases Receivable [Member]
        
Loans receivable:        
Ending balance: individually evaluated for impairment 2,027 564 2,027 564
Ending balance: collectively evaluated for impairment 37,864 44,661 37,864 44,661
Real estate loans [Member] | Loans [Member]
        
Loans receivable:        
Ending balance: individually evaluated for impairment 35,654 29,424 35,654 29,424
Ending balance: collectively evaluated for impairment 2,308,884 1,892,235 2,308,884 1,892,235
Ending balance: acquired with deteriorated credit quality 66,616   66,616  
Commercial and industrial loans [Member]
        
Allowance for loan losses:        
Balance at beginning of period 9,738 11,118 11,287 10,636
Charge-offs (499) (3,575) (3,394) (6,314)
Recoveries on loans previously charged off 365 737 3,338 1,981
Provision (negative provision) 260 388 (1,367) 2,365
Balance at end of period 9,864 8,668 9,864 8,668
Loans receivable:        
Balance at end of period 235,898 203,547 235,898 203,547
Commercial and industrial loans [Member] | Allowance for Loans and Leases Receivable [Member]
        
Loans receivable:        
Ending balance: individually evaluated for impairment 3,757 1,475 3,757 1,475
Ending balance: collectively evaluated for impairment 6,107 7,193 6,107 7,193
Commercial and industrial loans [Member] | Loans [Member]
        
Loans receivable:        
Ending balance: individually evaluated for impairment 11,970 12,468 11,970 12,468
Ending balance: collectively evaluated for impairment 223,578 191,079 223,578 191,079
Ending balance: acquired with deteriorated credit quality 350   350  
Consumer loans [Member]
        
Allowance for loan losses:        
Balance at beginning of period 540 1,884 1,427 2,280
Charge-offs (35) (18) (102) (218)
Recoveries on loans previously charged off 5 5 20 60
Provision (negative provision) (186) (232) (1,021) (483)
Balance at end of period 324 1,639 324 1,639
Loans receivable:        
Balance at end of period 28,907 34,065 28,907 34,065
Consumer loans [Member] | Allowance for Loans and Leases Receivable [Member]
        
Loans receivable:        
Ending balance: individually evaluated for impairment   330   330
Ending balance: collectively evaluated for impairment 324 1,309 324 1,309
Consumer loans [Member] | Loans [Member]
        
Loans receivable:        
Ending balance: individually evaluated for impairment 1,758 1,574 1,758 1,574
Ending balance: collectively evaluated for impairment 27,091 32,491 27,091 32,491
Ending balance: acquired with deteriorated credit quality 58   58  
Unallocated [Member]
        
Allowance for loan losses:        
Balance at beginning of period 1,305 478 1,291 917
Provision (negative provision) (205) 1,629 (191) 1,190
Balance at end of period 1,100 2,107 1,100 2,107
Unallocated [Member] | Allowance for Loans and Leases Receivable [Member]
        
Loans receivable:        
Ending balance: collectively evaluated for impairment $ 1,100 $ 2,107 $ 1,100 $ 2,107