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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 193,861	$ 221,514
Gross Unrealized Gains	921	823
Gross Unrealized Losses	(1,971)	(3,810)
Fair Value	192,811	218,527
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,790	24,920
Gross Unrealized Gains		1
Gross Unrealized Losses	(114)	(146)
Fair Value	15,676	24,775
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,224	84,266
Gross Unrealized Gains		3
Gross Unrealized Losses	(1,064)	(1,795)
Fair Value	78,160	82,474
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,409	49,155
Gross Unrealized Gains	142	185
Gross Unrealized Losses	(561)	(879)
Fair Value	41,990	48,461
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56,438	63,173
Gross Unrealized Gains	779	634
Gross Unrealized Losses	(232)	(990)
Fair Value	$ 56,985	$ 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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-Topic 320
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-Section 50
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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