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Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Receivables [Abstract]            
ACL - loans $ 256,727   $ 277,567      
ACL - OBS credit exposure 14,783   14,373      
Total ACL $ 271,510 $ 269,805 $ 291,940 $ 282,358 $ 272,920 $ 166,209