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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 199,165	$ 221,514
Gross Unrealized Gains	501	823
Gross Unrealized Losses	(3,268)	(3,810)
Fair Value	196,398	218,527
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,219	24,920
Gross Unrealized Gains		1
Gross Unrealized Losses	(241)	(146)
Fair Value	20,978	24,775
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	82,198	84,266
Gross Unrealized Gains		3
Gross Unrealized Losses	(1,732)	(1,795)
Fair Value	80,466	82,474
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,236	49,155
Gross Unrealized Gains	64	185
Gross Unrealized Losses	(790)	(879)
Fair Value	39,510	48,461
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,512	63,173
Gross Unrealized Gains	437	634
Gross Unrealized Losses	(505)	(990)
Fair Value	$ 55,444	$ 62,817

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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