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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (25) $ (1,359)
Fair Value, Less Than Twelve Months 7,811 91,400
Gross Unrealized Losses, Twelve Months and Over (18,739) (30,631)
Fair Value, Twelve Months and Over 313,197 313,454
Gross Unrealized Losses, Total (18,764) (31,990)
Fair Value, Total 321,008 404,854
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months   (467)
Fair Value, Less Than Twelve Months   31,533
Gross Unrealized Losses, Twelve Months and Over (2,778) (4,948)
Fair Value, Twelve Months and Over 64,857 62,151
Gross Unrealized Losses, Total (2,778) (5,415)
Fair Value, Total 64,857 93,684
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Twelve Months and Over (5,193) (9,494)
Fair Value, Twelve Months and Over 124,120 131,335
Gross Unrealized Losses, Total (5,193) (9,494)
Fair Value, Total 124,120 131,335
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (11) (668)
Fair Value, Less Than Twelve Months 6,445 51,236
Gross Unrealized Losses, Twelve Months and Over (8,254) (11,986)
Fair Value, Twelve Months and Over 69,976 66,877
Gross Unrealized Losses, Total (8,265) (12,654)
Fair Value, Total 76,421 118,113
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (14) (224)
Fair Value, Less Than Twelve Months 1,366 8,631
Gross Unrealized Losses, Twelve Months and Over (2,514) (4,203)
Fair Value, Twelve Months and Over 54,244 53,091
Gross Unrealized Losses, Total (2,528) (4,427)
Fair Value, Total $ 55,610 $ 61,722