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Commitments and Contingencies (Off-Balance Sheet Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Commitments to Extend Credit [Member]    
Loss Contingencies [Line Items]    
Contract amounts $ 8,106,223 $ 7,530,143
Letters of Credit [Member]    
Loss Contingencies [Line Items]    
Contract amounts $ 365,510 $ 393,284