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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 192,618	$ 199,165
Gross Unrealized Gains	334	501
Gross Unrealized Losses	(5,916)	(3,268)
Fair Value	187,036	196,398
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,168	21,219
Gross Unrealized Losses	(377)	(241)
Fair Value	20,791	20,978
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,169	82,198
Gross Unrealized Losses	(2,859)	(1,732)
Fair Value	76,310	80,466
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,416	40,236
Gross Unrealized Gains	21	64
Gross Unrealized Losses	(1,601)	(790)
Fair Value	34,836	39,510
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,865	55,512
Gross Unrealized Gains	313	437
Gross Unrealized Losses	(1,079)	(505)
Fair Value	$ 55,099	$ 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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