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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 222,002	$ 234,793
Gross Unrealized Gains	2,495	1,664
Gross Unrealized Losses	(24)	(1,342)
Fair Value	224,473	235,115
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,962	38,778
Gross Unrealized Gains	97	36
Gross Unrealized Losses		(309)
Fair Value	31,059	38,505
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	99,161	99,000
Gross Unrealized Gains	502	55
Gross Unrealized Losses	(9)	(835)
Fair Value	99,654	98,220
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	29,986	26,157
Gross Unrealized Gains	408	283
Gross Unrealized Losses	(4)	(116)
Fair Value	30,390	26,324
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	61,893	70,858
Gross Unrealized Gains	1,488	1,290
Gross Unrealized Losses	(11)	(82)
Fair Value	$ 63,370	$ 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
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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