Amortized Cost and Estimated Fair Value of Available-For-Sale and Held-To-Maturity Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale securities
Due within one year, Amortized cost	$ 393
Due within one year, fair value	399
Due after one year but within five years, Amortized cost	19,005
Due after one year but within five years, fair value	19,634
Due after five years but within ten years, Amortized cost	18,071
Due after five years but within ten years, fair value	19,027
Due after ten years, Amortized cost	168,958
Due after ten years, fair value	163,919
Amortized cost	539,398	534,810
Fair Value	537,507	534,358
Held-to-maturity securities
Due within one year, Amortized cost	60
Due after one year but within five years, Amortized cost	756
Due after five years but within ten years, Amortized cost
Due after ten years, Amortized cost
Amortized cost	816	816
Held-to-maturity securities
Due within one year, fair value	61
Due after one year but within five years, fair value	763
Due after five years but within ten years, fair value
Due after ten years, fair value
Fair Value	824	832
Debt Securities
Available-for-sale securities
Amortized cost	206,427
Fair Value	202,979
Total Mortgage Backed Securities
Available-for-sale securities
Amortized cost	331,722	324,538
Fair Value	333,153	326,964
Equity Securities
Available-for-sale securities
Amortized cost	1,249	3,446
Fair Value	$ 1,375	$ 3,531

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