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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Reserve for off-balance sheet credit exposures	$ 345		$ 345		$ 529
Expense (recovery) through noninterest expense	(245)	76	(184)	(70)
Mortgage Partnership Finance Program [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Sum of total loans sold under the MPF Program			54,972		61,862
Limited recourse debt	8,508		8,508		8,508
Charge (recovery) to other expenses	$ 162	$ 76	$ 131	$ 20

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- Definition

Concentration Risk Credit Risk Financial Instrument Maximum Exposure Charged (Recovery) To Noninterest Expense

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No definition available.

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- Definition

Concentration risk credit risk financial instrument maximum exposure liability.

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No definition available.

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- Definition

Limited recourse debt.

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No definition available.

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Balance Type:	credit
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- Definition

Mortgage Partnership Finance Program Recourse Liability Charges (Recoveries)

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No definition available.

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- Definition

Sum total of loans sold under the mortgage partnership finance program.

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No definition available.

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