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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 214,603	$ 234,793
Gross Unrealized Gains	2,506	1,664
Gross Unrealized Losses	(46)	(1,342)
Fair Value	217,063	235,115
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,031	38,778
Gross Unrealized Gains	93	36
Gross Unrealized Losses		(309)
Fair Value	26,124	38,505
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	93,043	99,000
Gross Unrealized Gains	450	55
Gross Unrealized Losses		(835)
Fair Value	93,493	98,220
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,382	26,157
Gross Unrealized Gains	352	283
Gross Unrealized Losses	(23)	(116)
Fair Value	32,711	26,324
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,147	70,858
Gross Unrealized Gains	1,611	1,290
Gross Unrealized Losses	(23)	(82)
Fair Value	$ 64,735	$ 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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