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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 188,604	$ 172,263
Gross Unrealized Gains	2,101	295
Gross Unrealized Losses	(240)	(4,111)
Fair Value	190,465	168,447
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,029	23,078
Gross Unrealized Gains	10	6
Gross Unrealized Losses	(30)	(254)
Fair Value	14,009	22,830
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,130	71,235
Gross Unrealized Gains	948	2
Gross Unrealized Losses	(35)	(1,910)
Fair Value	80,043	69,327
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	57,180	37,342
Gross Unrealized Gains	446	62
Gross Unrealized Losses	(165)	(1,142)
Fair Value	57,461	36,262
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,265	40,608
Gross Unrealized Gains	697	225
Gross Unrealized Losses	(10)	(805)
Fair Value	$ 38,952	$ 40,028

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).

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