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Recent Accounting and Regulatory Pronouncements - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Additional allowance for credit losses for loans $ 406,460 $ 457,309 $ 144,785   $ 56,927
Deferred tax assets 105,087 110,946      
Additional reserve for unfunded commitments 35,800        
Retained earnings $ 770,952 $ 657,451      
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)  
[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.