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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (74) $ (26)
Fair Value, Less Than Twelve Months 6,127 5,797
Gross Unrealized Losses, Twelve Months and Over (38,733) (36,835)
Fair Value, Twelve Months and Over 335,231 345,911
Gross Unrealized Losses, Total (38,807) (36,861)
Fair Value, Total 341,358 351,708
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (3) (4)
Fair Value, Less Than Twelve Months 561 494
Gross Unrealized Losses, Twelve Months and Over (7,146) (6,909)
Fair Value, Twelve Months and Over 74,132 79,528
Gross Unrealized Losses, Total (7,149) (6,913)
Fair Value, Total 74,693 80,022
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Twelve Months and Over (13,190) (12,738)
Fair Value, Twelve Months and Over 127,738 128,222
Gross Unrealized Losses, Total (13,190) (12,738)
Fair Value, Total 127,738 128,222
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (33) (20)
Fair Value, Less Than Twelve Months 4,321 4,372
Gross Unrealized Losses, Twelve Months and Over (13,048) (11,909)
Fair Value, Twelve Months and Over 74,083 77,759
Gross Unrealized Losses, Total (13,081) (11,929)
Fair Value, Total 78,404 82,131
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (38) (2)
Fair Value, Less Than Twelve Months 1,245 931
Gross Unrealized Losses, Twelve Months and Over (5,349) (5,279)
Fair Value, Twelve Months and Over 59,278 60,402
Gross Unrealized Losses, Total (5,387) (5,281)
Fair Value, Total $ 60,523 $ 61,333