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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	Jun. 30, 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	387,934	414,298
Available for sale securities, Gross Unrealized Gains	4,912	1,602
Available for sale securities, Gross Unrealized Losses	2,954	9,026
Available for sale securities, debt securities, Fair Value	389,892	406,874
Available for sale securities, Total	387,984	414,348
Available for sale securities, Gross Unrealized Gains	4,931	1,621
Available for sale securities, Gross Unrealized Losses	2,954	9,026
Available for sale securities, Total	389,961	406,943
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	24,646	25,610
Available for sale securities, Gross Unrealized Gains	0	34
Available for sale securities, Gross Unrealized Losses	238	193
Available for sale securities, debt securities, Fair Value	24,408	25,451
U.S. Government Sponsored Enterprises (GSE) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	1,464	14,431
Available for sale securities, Gross Unrealized Gains	0	5
Available for sale securities, Gross Unrealized Losses	0	722
Available for sale securities, debt securities, Fair Value	1,464	13,714
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	53,538	75,494
Available for sale securities, Gross Unrealized Gains	690	417
Available for sale securities, Gross Unrealized Losses	1,395	4,367
Available for sale securities, debt securities, Fair Value	52,833	71,544
GSE Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	154,773	198,449
Available for sale securities, Gross Unrealized Gains	2,629	895
Available for sale securities, Gross Unrealized Losses	57	725
Available for sale securities, debt securities, Fair Value	157,345	198,619
GSE Residential Collateralized Mortgage Obligations (CMOs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	88,240	40,502
Available for sale securities, Gross Unrealized Gains	885	251
Available for sale securities, Gross Unrealized Losses	498	221
Available for sale securities, debt securities, Fair Value	88,627	40,532
GSE Commercial CMOs [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale debt securities, Amortized Cost	65,273	59,812
Available for sale securities, Gross Unrealized Gains	708	0
Available for sale securities, Gross Unrealized Losses	766	2,798
Available for sale securities, debt securities, Fair Value	$ 65,215	$ 57,014

X

- Definition

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

+ References

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

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