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Loan Servicing - Unpaid Principal Balance of Serviced Mortgage Loans for Others (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, end of period $ 119,922 $ 133,107 $ 136,525
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, end of period 13,325 16,755 23,832
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, end of period $ 106,597 $ 116,352 $ 112,693