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Borrowings - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Maximum borrowing capacity with FHLB	$ 826,400,000
Unused capacity funds	589,900,000
Capital stock of FHLB	12,590,000	10,761,000
Overnight Fed Funds
Debt Instrument [Line Items]
Unused capacity funds	39,000,000
Federal Reserve Discount Window
Debt Instrument [Line Items]
Unused capacity funds	88,500,000
Revolving line of credit with correspondent bank
Debt Instrument [Line Items]
Unused capacity funds	$ 3,000,000

Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).