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
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Allowance for loan losses:      
Balance at beginning of period $ 57,555 $ 63,305  
Charge-offs (1,604) (3,024)  
Recoveries on loans previously charged off 4,251 714  
(Negative provision) provision (3,609) 196  
Balance at end of period 56,593 61,191  
Loans receivable:      
Ending balance 2,276,372 2,121,686 2,234,089
Allowance for Loans and Leases Receivable [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment 5,119 4,884  
Ending balance: collectively evaluated for impairment 51,474 56,307  
Loans [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment 50,350 49,651  
Ending balance: collectively evaluated for impairment 2,226,022 2,072,035  
Real estate loans [Member]
     
Allowance for loan losses:      
Balance at beginning of period 43,550 49,472  
Charge-offs (1,128) (1,285)  
Recoveries on loans previously charged off 2,918 181  
(Negative provision) provision (1,110) (2,040)  
Balance at end of period 44,230 46,328  
Loans receivable:      
Ending balance 2,027,914 1,882,445 1,969,798
Real estate loans [Member] | Allowance for Loans and Leases Receivable [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment 1,029 764  
Ending balance: collectively evaluated for impairment 43,201 45,564  
Real estate loans [Member] | Loans [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment 34,294 31,317  
Ending balance: collectively evaluated for impairment 1,993,620 1,851,128  
Commercial and industrial loans [Member]
     
Allowance for loan losses:      
Balance at beginning of period 11,287 10,636  
Charge-offs (422) (1,575)  
Recoveries on loans previously charged off 1,321 484  
(Negative provision) provision (1,761) 1,519  
Balance at end of period 10,425 11,064  
Loans receivable:      
Ending balance 219,102 204,061 231,786
Commercial and industrial loans [Member] | Allowance for Loans and Leases Receivable [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment 3,973 3,719  
Ending balance: collectively evaluated for impairment 6,452 7,345  
Commercial and industrial loans [Member] | Loans [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment 14,503 16,695  
Ending balance: collectively evaluated for impairment 204,599 187,366  
Consumer loans [Member]
     
Allowance for loan losses:      
Balance at beginning of period 1,427 2,280  
Charge-offs (54) (164)  
Recoveries on loans previously charged off 12 49  
(Negative provision) provision (752) (370)  
Balance at end of period 633 1,795  
Loans receivable:      
Ending balance 29,356 35,180 32,505
Consumer loans [Member] | Allowance for Loans and Leases Receivable [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment 117 401  
Ending balance: collectively evaluated for impairment 516 1,394  
Consumer loans [Member] | Loans [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment 1,553 1,639  
Ending balance: collectively evaluated for impairment 27,803 33,541  
Unallocated [Member]
     
Allowance for loan losses:      
Balance at beginning of period 1,291 917  
Charge-offs        
Recoveries on loans previously charged off        
(Negative provision) provision 14 1,087  
Balance at end of period 1,305 2,004  
Loans receivable:      
Ending balance        
Unallocated [Member] | Allowance for Loans and Leases Receivable [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment        
Ending balance: collectively evaluated for impairment 1,305 2,004  
Unallocated [Member] | Loans [Member]
     
Allowance for loan losses:      
Ending balance: individually evaluated for impairment        
Ending balance: collectively evaluated for impairment