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Goodwill and Intangibles - Schedule of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 12,154 $ 5,304
Accumulated Amortization (2,714) (2,382)
Net Carrying Value 9,440 2,922
Core Deposits [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value 9,626 2,776
Accumulated Amortization (1,683) (1,366)
Net Carrying Value 7,943 1,410
Other [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value 2,528 2,528
Accumulated Amortization (1,031) (1,016)
Net Carrying Value $ 1,497 $ 1,512