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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 221,514	$ 234,793
Gross Unrealized Gains	823	1,664
Gross Unrealized Losses	(3,810)	(1,342)
Fair Value	218,527	235,115
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,920	38,778
Gross Unrealized Gains	1	36
Gross Unrealized Losses	(146)	(309)
Fair Value	24,775	38,505
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	84,266	99,000
Gross Unrealized Gains	3	55
Gross Unrealized Losses	(1,795)	(835)
Fair Value	82,474	98,220
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	49,155	26,157
Gross Unrealized Gains	185	283
Gross Unrealized Losses	(879)	(116)
Fair Value	48,461	26,324
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,173	70,858
Gross Unrealized Gains	634	1,290
Gross Unrealized Losses	(990)	(82)
Fair Value	$ 62,817	$ 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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-Section 50
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