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Securities - Schedule of Contractual Maturity of Securities Available for Sale, Excluding Equity Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
1 year or less, Amortized Cost	$ 31,904
1 year - 5 years, Amortized Cost	137,688
5 years - 10 years, Amortized Cost	163,672
After 10 years, Amortized Cost	42,658
Total, Amortized Cost	375,922
1 year or less, Fair Value	31,651
1 year - 5 years, Fair Value	138,186
5 years - 10 years, Fair Value	162,836
After 10 years, Fair Value	41,360
Total, Fair Value	374,033
Total debt securities, Amortized Cost	707,283
Total debt securities, Fair Value	699,535
Residential and Multi Family Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Mortgage & asset backed securities, Amortized Cost	258,466
Mortgage & asset backed securities, Fair Value	255,039
Pooled SBA [Member]
Schedule of Available-for-sale Securities [Line Items]
Mortgage & asset backed securities, Amortized Cost	71,924
Mortgage & asset backed securities, Fair Value	69,513
Commercial Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Mortgage & asset backed securities, Amortized Cost	971
Mortgage & asset backed securities, Fair Value	$ 950

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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 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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