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Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Allowance for loan losses                
Available for sale debt securities past due $ 0   $ 0          
Allowance for credit losses 109,512 $ 155,214 109,512 $ 155,214 $ 115,269 $ 149,044 $ 156,383 $ 61,136
Increase in allowance on individually evaluated loans   1,200   22,600        
Increase in allowance on collectively evaluated loans 11,000 600 45,200 77,200        
Provision for (reversal of) credit losses $ 5,200   5,600          
Allowance for Loan and Lease Losses Write-offs, Net   $ 600 $ (100) $ 18,500        
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjusted Balance                
Allowance for loan losses                
Allowance for credit losses               73,700
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment                
Allowance for loan losses                
Allowance for credit losses               12,562
Allowance in credit loss from expansion of horizon to life of loan               18,900
Non-credit component with allowance of previous categorized PCI loans               $ 6,300