Securities - Fair Value of Securities Available for Sale by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 6,450
Due after one year through five years, Amortized Cost	21,276
Due after five years through ten years, Amortized Cost	32,826
Due after ten years, Amortized Cost	73,990
Mortgage-backed securities, Amortized Cost	63,779
Equity securities, Amortized Cost	481
Total securities available for sale, Amortized Cost	198,802	195,098
Due in one year or less, Fair Value	6,478
Due after one year through five years, Fair Value	21,110
Due after five years through ten years, Fair Value	33,144
Due after ten years, Fair Value	74,707
Mortgage-backed securities, Fair Value	64,484
Equity securities, Fair Value	433
Total securities available for sale, Fair Value	$ 200,356	$ 203,961

Available for sale securities equity maturities amortized cost.

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Available-for-sale securities equity maturities fair value.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing after the tenth fiscal year following the latest fiscal year.

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