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Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Receivables [Abstract]        
ACL - loans $ 265,986 $ 277,567    
ACL - OBS credit exposure 14,273 14,373    
Total ACL $ 280,259 $ 291,940 $ 257,471 $ 166,209