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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 3,643	$ 4,358
Amortized cost one to five years	49,198	49,415
Amortized cost for five to ten years	106,225	98,551
Amortized cost for after ten years	62,120	61,313
Total amortized cost	221,186	213,637
Total available for sale investment securities, Amortized Cost	508,427	463,306
Within one year, amortized cost	9,910
One to five years, amortized cost
Total held to maturity investment securities, amortized cost	9,910
Fair value within one year	3,663	4,368
Fair value for one to five years	49,627	50,673
Fair value for five to ten years	107,424	104,258
Fair value for after ten years	61,051	65,436
Total fair value	221,765	224,735
Investment securities, available for sale	508,591	482,801
Within one year, fair value	9,910
One to five years, fair value
Held-to-maturity, fair value	9,910	0
Federal agency collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	116,047	95,337
Investment securities, available for sale	114,706	96,831
Federal agency mortgage-backed pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	170,006	152,372
Investment securities, available for sale	170,894	159,204
Private labeled mortgage-backed pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	1,188	1,960
Investment securities, available for sale	$ 1,226	$ 2,031

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