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Borrowings - Additional Information (Detail) (USD $)	9 Months Ended		3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Convertible Advances	Sep. 30, 2014 Wholesale Repurchase Agreements	Dec. 31, 2013 Wholesale Repurchase Agreements	Sep. 30, 2014 FHLB Borrowings	Dec. 31, 2013 FHLB Borrowings
Debt Instrument [Line Items]
Weighted average rate of federal funds purchased		0.36%
Weighted average rate of retail repurchase agreements	0.13%	0.38%
Weighted average contractual rate				3.71%	3.71%	4.09%	4.12%
FHLB borrowing amount paid			$ 35,000,000
FHLB advances			50,000,000
FHLB, interest rate			4.21%
FHLB, maturity period			2017-05
Qualifying loans	1,180,000,000	1,130,000,000
Unused borrowing capacity						395,440,000
Junior subordinated debentures issued	$ 15,460,000
Libor rate	2.95%
Debentures mature date	Oct. 08, 2033

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Federal Home Loan Bank, Advances, Maturity period

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Weighted average contractual rate.

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Weighted Average Rate of Federal Funds Purchased

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Weighted Average Rate of Retail Repurchase Agreements

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Interest rate of advances made and reported by Federal Home Loan Bank (FHLBank).

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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Amount of cash outflow from payments for Federal Home Loan Bank (FHLBank) advances.

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The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

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