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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 406,534	$ 300,602
Gross Unrealized Gains	4,702	7,350
Gross Unrealized Losses	(3,736)	(140)
Fair Value	407,500	307,812
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,989
Gross Unrealized Gains	1
Gross Unrealized Losses	(630)
Fair Value	63,360
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	151,203	122,514
Gross Unrealized Gains	1,233	1,857
Gross Unrealized Losses	(1,832)	(130)
Fair Value	150,604	124,241
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	128,312	110,828
Gross Unrealized Gains	1,336	2,228
Gross Unrealized Losses	(1,075)
Fair Value	128,573	113,056
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,030	67,260
Gross Unrealized Gains	2,132	3,265
Gross Unrealized Losses	(199)	(10)
Fair Value	$ 64,963	$ 70,515

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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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