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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (1) $ (238)
Fair Value, Less Than Twelve Months 513 55,090
Gross Unrealized Losses, Twelve Months and Over (2) (142)
Fair Value, Twelve Months and Over 2,044 27,107
Gross Unrealized Losses, Total (3) (380)
Fair Value, Total 2,557 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   (16)
Fair Value, Less Than Twelve Months   10,549
Gross Unrealized Losses, Twelve Months and Over   (5)
Fair Value, Twelve Months and Over   10,745
Gross Unrealized Losses, Total   (21)
Fair Value, Total   21,294
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months   (102)
Fair Value, Less Than Twelve Months   27,696
Gross Unrealized Losses, Twelve Months and Over   (125)
Fair Value, Twelve Months and Over   11,332
Gross Unrealized Losses, Total   (227)
Fair Value, Total   39,028
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1) (120)
Fair Value, Less Than Twelve Months 513 16,845
Gross Unrealized Losses, Twelve Months and Over (2)  
Fair Value, Twelve Months and Over 2,044  
Gross Unrealized Losses, Total (3) (120)
Fair Value, Total $ 2,557 $ 16,845