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Premises and Equipment - Depreciation and Amortization Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 7,833 $ 7,715 $ 7,604
Premises      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense 2,608 2,809 2,989
Furniture, fixtures, and equipment      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 5,225 $ 4,906 $ 4,615