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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 189,284	$ 199,165
Gross Unrealized Gains	210	501
Gross Unrealized Losses	(6,419)	(3,268)
Fair Value	183,075	196,398
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,141	21,219
Gross Unrealized Losses	(370)	(241)
Fair Value	20,771	20,978
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	78,753	82,198
Gross Unrealized Losses	(2,986)	(1,732)
Fair Value	75,767	80,466
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,350	40,236
Gross Unrealized Gains	11	64
Gross Unrealized Losses	(1,761)	(790)
Fair Value	34,600	39,510
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53,040	55,512
Gross Unrealized Gains	199	437
Gross Unrealized Losses	(1,302)	(505)
Fair Value	$ 51,937	$ 55,444

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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