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Premises and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 32,200 $ 30,800 $ 28,600
Repairs and maintenance expense 16,400 17,800 16,900
Capitalized Interest Costs, Including Allowance for Funds Used During Construction $ 14 $ 0 $ 0