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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (238) $ (26)
Fair Value, Less Than Twelve Months 55,090 3,951
Gross Unrealized Losses, Twelve Months and Over (142) (4,085)
Fair Value, Twelve Months and Over 27,107 145,348
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Twelve Months and Over (12) (254)
Fair Value, Twelve Months and Over 5,030 20,861
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (16)  
Fair Value, Less Than Twelve Months 10,549  
Gross Unrealized Losses, Twelve Months and Over (5) (1,910)
Fair Value, Twelve Months and Over 10,745 64,727
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (102) (4)
Fair Value, Less Than Twelve Months 27,696 697
Gross Unrealized Losses, Twelve Months and Over (125) (1,138)
Fair Value, Twelve Months and Over 11,332 30,347
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (120) (22)
Fair Value, Less Than Twelve Months $ 16,845 3,254
Gross Unrealized Losses, Twelve Months and Over   (783)
Fair Value, Twelve Months and Over   $ 29,413