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Basis of Accounting and Consolidation - Schedule of Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Balance $ 568,228 $ 526,609 $ 475,864 $ 307,964
AOCI Attributable to Parent        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Net unrealized gains on securities available-for-sale 24,077 11,825    
Unamortized losses on securities held-to-maturity transferred from available-for-sale   (50)    
Tax Expense (6,982) (3,415)    
Balance $ 17,095 $ 8,360 $ (6,473) $ (2,304)