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Investment Securities and Other Investments - Summary of Fair Value and Gross Unrealized Losses of Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Fair Value, Less Than 12 Months, Total $ 28,234 $ 18,423
Unrealized Losses, Less than 12 Months, Total (84) (192)
Fair Value, 12 Months or Greater, Total 8,193 23,230
Unrealized Losses, 12 Months or Greater, Total (125) (832)
Fair Value, Total 36,427 41,653
Unrealized Losses, Total (209) (1,024)
State and Municipal [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Held to maturity, Fair Value, Less Than 12 Months 333 6,278
Held to maturity, Unrealized Losses, Less Than 12 Months (2) (105)
Held to maturity, Fair Value 12 Months or Greater   2,402
Held to maturity, Unrealized Losses, 12 Months or Greater   (35)
Fair Value, Total 333 8,680
Unrealized Losses, Total (2) (140)
U.S. Treasury and Agencies [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, 12 Months or Greater 1,949 3,167
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (51) (208)
Fair Value, Total 1,949 3,167
Unrealized Losses, Total (51) (208)
Corporate Bonds [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, Less Than 12 Months   2,114
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months   (36)
Available-for-sale Securities, Fair Value, 12 Months or Greater 896 488
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (4) (12)
Fair Value, Total 896 2,602
Unrealized Losses, Total (4) (48)
Mortgage Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, Less Than 12 Months 27,901 10,031
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (82) (51)
Available-for-sale Securities, Fair Value, 12 Months or Greater 5,348 17,173
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (70) (577)
Fair Value, Total 33,249 27,204
Unrealized Losses, Total $ (152) $ (628)