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Securities Available for Sale - Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available for sale equity securities - financial services, Amortized Cost	$ 50	$ 50
Available for sale securities, Gross Unrealized Gains	19	19
Available for sale securities, Gross Unrealized Losses	0	0
Available for sale securities, equity securities - financial services, Fair Value	69	69
Available for sale debt securities, Amortized Cost	434,870	414,298
Available for sale securities, Gross Unrealized Gains	2,697	1,602
Available for sale securities, Gross Unrealized Losses	5,850	9,026
Available for sale securities, debt securities, Fair Value	431,717	406,874
Available for sale securities, Total	434,920	414,348
Available for sale securities, Gross Unrealized Gains	2,716	1,621
Available for sale securities, Gross Unrealized Losses	5,850	9,026
Available for sale securities, Total	431,786	406,943
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	25,265	25,610
Available for sale securities, Gross Unrealized Gains	0	34
Available for sale securities, Gross Unrealized Losses	282	193
Available for sale securities, debt securities, Fair Value	24,983	25,451
U.S. Government Sponsored Enterprises (GSE) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	24,204	14,431
Available for sale securities, Gross Unrealized Gains	74	5
Available for sale securities, Gross Unrealized Losses	465	722
Available for sale securities, debt securities, Fair Value	23,813	13,714
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	66,340	75,494
Available for sale securities, Gross Unrealized Gains	843	417
Available for sale securities, Gross Unrealized Losses	2,414	4,367
Available for sale securities, debt securities, Fair Value	64,769	71,544
GSE Residential Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	158,080	198,449
Available for sale securities, Gross Unrealized Gains	1,335	895
Available for sale securities, Gross Unrealized Losses	215	725
Available for sale securities, debt securities, Fair Value	159,200	198,619
GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	95,590	40,502
Available for sale securities, Gross Unrealized Gains	367	251
Available for sale securities, Gross Unrealized Losses	749	221
Available for sale securities, debt securities, Fair Value	95,208	40,532
GSE Commercial CMOs [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	65,391	59,812
Available for sale securities, Gross Unrealized Gains	78	0
Available for sale securities, Gross Unrealized Losses	1,725	2,798
Available for sale securities, debt securities, Fair Value	$ 63,744	$ 57,014

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- Definition

Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

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