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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 198,004	$ 220,904
Gross Unrealized Gains	6,120	1,769
Gross Unrealized Losses	(3)	(380)
Fair Value	204,121	222,293
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,016	10,023
Gross Unrealized Gains	57	10
Gross Unrealized Losses		(12)
Fair Value	10,073	10,021
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	47,869	61,882
Gross Unrealized Gains	1,880	584
Gross Unrealized Losses		(21)
Fair Value	49,749	62,445
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	97,726	94,998
Gross Unrealized Gains	2,968	426
Gross Unrealized Losses		(227)
Fair Value	100,694	95,197
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,393	54,001
Gross Unrealized Gains	1,215	749
Gross Unrealized Losses	(3)	(120)
Fair Value	$ 43,605	$ 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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