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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 229,514	$ 220,904
Gross Unrealized Gains	6,800	1,769
Gross Unrealized Losses	(22)	(380)
Fair Value	236,292	222,293
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,004	10,023
Gross Unrealized Gains	26	10
Gross Unrealized Losses		(12)
Fair Value	8,030	10,021
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	70,535	61,882
Gross Unrealized Gains	1,850	584
Gross Unrealized Losses	(16)	(21)
Fair Value	72,369	62,445
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	100,864	94,998
Gross Unrealized Gains	2,839	426
Gross Unrealized Losses	(4)	(227)
Fair Value	103,699	95,197
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	50,111	54,001
Gross Unrealized Gains	2,085	749
Gross Unrealized Losses	(2)	(120)
Fair Value	$ 52,194	$ 54,630

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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