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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 172,263	$ 199,165
Gross Unrealized Gains	295	501
Gross Unrealized Losses	(4,111)	(3,268)
Fair Value	168,447	196,398
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,078	21,219
Gross Unrealized Gains	6
Gross Unrealized Losses	(254)	(241)
Fair Value	22,830	20,978
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	71,235	82,198
Gross Unrealized Gains	2
Gross Unrealized Losses	(1,910)	(1,732)
Fair Value	69,327	80,466
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	37,342	40,236
Gross Unrealized Gains	62	64
Gross Unrealized Losses	(1,142)	(790)
Fair Value	36,262	39,510
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,608	55,512
Gross Unrealized Gains	225	437
Gross Unrealized Losses	(805)	(505)
Fair Value	$ 40,028	$ 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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