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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Allowance for loan losses:          
Beginning balance $ 61,191 $ 81,052 $ 63,305 $ 89,936  
Charge-offs (3,490) (14,716) (6,514) (27,037)  
Recoveries on loans previously charged off 1,867 1,324 2,581 2,361  
Provision 308 4,233 504 6,633  
Ending balance 59,876 71,893 59,876 71,893  
Ending balance: individually evaluated for impairment 5,424 7,661 5,424 7,661  
Ending balance: collectively evaluated for impairment 54,452 64,232 54,452 64,232  
Loans receivable:          
Ending balance 2,187,389 1,949,624 2,187,389 1,949,624 2,048,560
Ending balance: individually evaluated for impairment 45,674 60,107 45,674 60,107  
Ending balance: collectively evaluated for impairment 2,141,715 1,889,517 2,141,715 1,889,517  
Real estate loans [Member]
          
Allowance for loan losses:          
Beginning balance 17,832 22,230 18,180 19,637  
Charge-offs (146) (5,243) (359) (8,085)  
Recoveries on loans previously charged off 1,042 517 1,050 517  
Provision (248) 3,902 (391) 9,337  
Ending balance 18,480 21,406 18,480 21,406  
Ending balance: individually evaluated for impairment 28 437 28 437  
Ending balance: collectively evaluated for impairment 18,452 20,969 18,452 20,969  
Loans receivable:          
Ending balance 976,436 839,816 976,436 839,816  
Ending balance: individually evaluated for impairment 6,972 16,619 6,972 16,619  
Ending balance: collectively evaluated for impairment 969,464 823,197 969,464 823,197  
Commercial and industrial loans [Member]
          
Allowance for loan losses:          
Beginning balance 39,560 54,638 41,928 66,005  
Charge-offs (3,308) (9,393) (5,955) (18,508)  
Recoveries on loans previously charged off 819 789 1,476 1,802  
Provision 1,963 776 1,585 (2,489)  
Ending balance 39,034 46,810 39,034 46,810  
Ending balance: individually evaluated for impairment 5,011 7,224 5,011 7,224  
Ending balance: collectively evaluated for impairment 34,023 39,586 34,023 39,586  
Loans receivable:          
Ending balance 1,175,573 1,070,469 1,175,573 1,070,469  
Ending balance: individually evaluated for impairment 37,055 42,087 37,055 42,087  
Ending balance: collectively evaluated for impairment 1,138,518 1,028,382 1,138,518 1,028,382  
Consumer loans [Member]
          
Allowance for loan losses:          
Beginning balance 1,795 2,244 2,280 2,243  
Charge-offs (36) (80) (200) (444)  
Recoveries on loans previously charged off 6 18 55 42  
Provision 119 (425) (251) (84)  
Ending balance 1,884 1,757 1,884 1,757  
Ending balance: individually evaluated for impairment 385   385    
Ending balance: collectively evaluated for impairment 1,499 1,757 1,499 1,757  
Loans receivable:          
Ending balance 35,380 39,339 35,380 39,339  
Ending balance: individually evaluated for impairment 1,647 1,401 1,647 1,401  
Ending balance: collectively evaluated for impairment 33,733 37,938 33,733 37,938  
Unallocated [Member]
          
Allowance for loan losses:          
Beginning balance 2,004 1,940 917 2,051  
Provision (1,526) (20) (439) (131)  
Ending balance 478 1,920 478 1,920  
Ending balance: collectively evaluated for impairment $ 478 $ 1,920 $ 478 $ 1,920