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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 234,793	$ 247,819
Gross Unrealized Gains	1,664	2,619
Gross Unrealized Losses	(1,342)	(1,946)
Fair Value	235,115	248,492
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,778	25,833
Gross Unrealized Gains	36
Gross Unrealized Losses	(309)	(440)
Fair Value	38,505	25,393
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	99,000	120,154
Gross Unrealized Gains	55	391
Gross Unrealized Losses	(835)	(1,311)
Fair Value	98,220	119,234
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,157	29,067
Gross Unrealized Gains	283	557
Gross Unrealized Losses	(116)	(62)
Fair Value	26,324	29,562
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	70,858	72,765
Gross Unrealized Gains	1,290	1,671
Gross Unrealized Losses	(82)	(133)
Fair Value	$ 72,066	$ 74,303

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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