Annual report pursuant to Section 13 and 15(d)

Loans - Allowance for Loan Losses and Allowance for Off-Balance Sheet Items (Detail)

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Loans - Allowance for Loan Losses and Allowance for Off-Balance Sheet Items (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance at beginning of period $ 63,305 $ 89,936  
Actual charge-offs (11,862) (38,227)  
Recoveries on loans previously charged off 5,536 4,439  
Provision charged to operating expense (576) (7,157)  
Balance at end of period 57,555 63,305  
Allowance for loan losses [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance at beginning of period 63,305 89,936 146,059
Actual charge-offs (11,862) (38,227) (78,652)
Recoveries on loans previously charged off 5,536 4,439 9,993
Net loan charge-offs (6,326) (33,788) (68,659)
Provision charged to operating expense 576 7,157 12,536
Balance at end of period 57,555 63,305 89,936
Allowance for off-balance sheet items [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance at beginning of period 1,824 2,981 3,417
Provision charged to operating expense (576) (1,157) (436)
Balance at end of period $ 1,248 $ 1,824 $ 2,981