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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 398,241 $ 439,186
Gross Unrealized Gains 3 69
Gross Unrealized Losses (49,989) (48,466)
Fair Value 348,255 390,789
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 91,356 104,507
Gross Unrealized Losses (9,378) (9,829)
Fair Value 81,978 94,678
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 140,993 156,817
Gross Unrealized Losses (17,231) (17,050)
Fair Value 123,762 139,767
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 92,356 101,068
Gross Unrealized Losses (15,876) (14,141)
Fair Value 76,480 86,927
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 73,536 76,794
Gross Unrealized Gains 3 69
Gross Unrealized Losses (7,504) (7,446)
Fair Value $ 66,035 $ 69,417