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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (4,842) $ (140)
Fair Value, Less Than Twelve Months 256,800 51,893
Gross Unrealized Losses, Twelve Months and Over (2,221)  
Fair Value, Twelve Months and Over 63,659  
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1,598)  
Fair Value, Less Than Twelve Months 89,177  
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1,898) (130)
Fair Value, Less Than Twelve Months 86,739 48,331
Gross Unrealized Losses, Twelve Months and Over (1,584)  
Fair Value, Twelve Months and Over 41,738  
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1,050)  
Fair Value, Less Than Twelve Months 63,157  
Gross Unrealized Losses, Twelve Months and Over (412)  
Fair Value, Twelve Months and Over 16,434  
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (296) (10)
Fair Value, Less Than Twelve Months 17,727 $ 3,562
Gross Unrealized Losses, Twelve Months and Over (225)  
Fair Value, Twelve Months and Over $ 5,487