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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 224,359	$ 234,793
Gross Unrealized Gains	2,268	1,664
Gross Unrealized Losses	(115)	(1,342)
Fair Value	226,512	235,115
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,696	38,778
Gross Unrealized Gains	56	36
Gross Unrealized Losses	(31)	(309)
Fair Value	33,721	38,505
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	102,437	99,000
Gross Unrealized Gains	420	55
Gross Unrealized Losses	(43)	(835)
Fair Value	102,814	98,220
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,787	26,157
Gross Unrealized Gains	372	283
Gross Unrealized Losses	(12)	(116)
Fair Value	25,147	26,324
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,439	70,858
Gross Unrealized Gains	1,420	1,290
Gross Unrealized Losses	(29)	(82)
Fair Value	$ 64,830	$ 72,066

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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