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Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Receivables [Abstract]            
ACL - loans $ 255,032   $ 277,567      
ACL - OBS credit exposure 14,773   14,373      
Total ACL $ 269,805 $ 280,259 $ 291,940 $ 272,920 $ 257,471 $ 166,209