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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (47) $ (238)
Fair Value, Less Than Twelve Months 26,369 55,090
Gross Unrealized Losses, Twelve Months and Over   (142)
Fair Value, Twelve Months and Over   27,107
Gross Unrealized Losses, Total (47) (380)
Fair Value, Total 26,369 82,197
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Twelve Months and Over   (12)
Fair Value, Twelve Months and Over   5,030
Gross Unrealized Losses, Total   (12)
Fair Value, Total   5,030
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (10) (16)
Fair Value, Less Than Twelve Months 14,010 10,549
Gross Unrealized Losses, Twelve Months and Over   (5)
Fair Value, Twelve Months and Over   10,745
Gross Unrealized Losses, Total (10) (21)
Fair Value, Total 14,010 21,294
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (31) (102)
Fair Value, Less Than Twelve Months 11,298 27,696
Gross Unrealized Losses, Twelve Months and Over   (125)
Fair Value, Twelve Months and Over   11,332
Gross Unrealized Losses, Total (31) (227)
Fair Value, Total 11,298 39,028
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (6) (120)
Fair Value, Less Than Twelve Months 1,061 16,845
Gross Unrealized Losses, Total (6) (120)
Fair Value, Total $ 1,061 $ 16,845