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Recent Accounting and Regulatory Pronouncements - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Additional allowance for credit losses for loans $ 314,144 $ 350,401 $ 457,309 $ 440,159 $ 434,608   $ 56,927
Deferred tax assets 19,684   110,946        
Additional reserve for unfunded commitments 28,300            
Retained earnings $ 925,044   $ 657,451        
Adjustments              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Additional allowance for credit losses for loans         433,066   111,365
ASU 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Additional allowance for credit losses for loans [1]           $ 54,438  
Deferred tax assets [2]           12,639  
Additional reserve for unfunded commitments           6,400  
Retained earnings [3]           (44,820)  
ASU 2016-13 | Adjustments              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Additional allowance for credit losses for loans       $ 109,442 $ (1,542) 56,927 $ 51,030
Deferred tax assets           31,316  
Additional reserve for unfunded commitments           6,400  
Retained earnings           $ 679,895  
[1] This is the calculated adjustment to the ACL related to the adoption of ASC 326. Additional reserve related to non-acquired loans was $34,049, to acquired loans was $16,981 and to purchased credit deteriorated loans was $3,408.
[2] This is the effect of deferred tax assets related to the adjustment to the ACL from the adoption of ASC 326 using a 22% tax rate.
[3] This is the net adjustment to retained earnings related to the adoption of ASC 326.