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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 251,624 $ 220,904
Gross Unrealized Gains 7,464 1,769
Gross Unrealized Losses (47) (380)
Fair Value 259,041 222,293
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,000 10,023
Gross Unrealized Gains 4 10
Gross Unrealized Losses   (12)
Fair Value 3,004 10,021
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 88,120 61,882
Gross Unrealized Gains 1,952 584
Gross Unrealized Losses (10) (21)
Fair Value 90,062 62,445
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 100,858 94,998
Gross Unrealized Gains 2,153 426
Gross Unrealized Losses (31) (227)
Fair Value 102,980 95,197
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 59,646 54,001
Gross Unrealized Gains 3,355 749
Gross Unrealized Losses (6) (120)
Fair Value $ 62,995 $ 54,630