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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 220,904	$ 172,263
Gross Unrealized Gains	1,769	295
Gross Unrealized Losses	(380)	(4,111)
Fair Value	222,293	168,447
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,023	23,078
Gross Unrealized Gains	10	6
Gross Unrealized Losses	(12)	(254)
Fair Value	10,021	22,830
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	61,882	71,235
Gross Unrealized Gains	584	2
Gross Unrealized Losses	(21)	(1,910)
Fair Value	62,445	69,327
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	94,998	37,342
Gross Unrealized Gains	426	62
Gross Unrealized Losses	(227)	(1,142)
Fair Value	95,197	36,262
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,001	40,608
Gross Unrealized Gains	749	225
Gross Unrealized Losses	(120)	(805)
Fair Value	$ 54,630	$ 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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