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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (6,965) $ (4,842)
Fair Value, Less Than Twelve Months 99,357 256,800
Gross Unrealized Losses, Twelve Months and Over (41,501) (2,221)
Fair Value, Twelve Months and Over 286,095 63,659
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (207) (1,598)
Fair Value, Less Than Twelve Months 9,121 89,177
Gross Unrealized Losses, Twelve Months and Over (9,622)  
Fair Value, Twelve Months and Over 85,557  
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1,081) (1,898)
Fair Value, Less Than Twelve Months 24,560 86,739
Gross Unrealized Losses, Twelve Months and Over (15,969) (1,584)
Fair Value, Twelve Months and Over 114,906 41,738
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (2,454) (1,050)
Fair Value, Less Than Twelve Months 26,905 63,157
Gross Unrealized Losses, Twelve Months and Over (11,687) (412)
Fair Value, Twelve Months and Over 60,022 16,434
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (3,223) (296)
Fair Value, Less Than Twelve Months 38,771 17,727
Gross Unrealized Losses, Twelve Months and Over (4,223) (225)
Fair Value, Twelve Months and Over $ 25,610 $ 5,487