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Recent Accounting and Regulatory Pronouncements - Impact of ASU (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets:          
Investment Securities - Available for Sale   $ 3,891,490 $ 3,330,672    
Investment Securities - Held to Maturity   1,214,313 955,542    
Allowance for Credit Losses on Loans   (406,460) (457,309) $ (144,785) $ (56,927)
Deferred Tax Asset   105,087 110,946    
Accrued Interest Receivable - Loans   89,500      
Liabilities:          
Reserve for Loan Losses - Unfunded Commitments   406,460 457,309    
Equity:          
Retained Earnings   770,952 657,451    
Credit Discount on Acquired Credit Impaired Loans $ 3,408        
Financing Receivable, Allowance for Credit Losses   $ 406,460 $ 457,309 $ 144,785 $ 56,927
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 22.00%        
Non-acquired loans          
Assets:          
Allowance for Credit Losses on Loans $ (34,049)        
Equity:          
Financing Receivable, Allowance for Credit Losses 34,049        
Acquired loans          
Assets:          
Allowance for Credit Losses on Loans (16,981)        
Equity:          
Financing Receivable, Allowance for Credit Losses 16,981        
Purchased Credit Deteriorated Loans          
Assets:          
Allowance for Credit Losses on Loans (3,408)        
Equity:          
Financing Receivable, Allowance for Credit Losses 3,408        
ASU 2016-13          
Assets:          
Acquired Loans [1] 1,723        
Allowance for Credit Losses on Loans [2] (54,438)        
Deferred Tax Asset [3] 12,639        
Accrued Interest Receivable - Loans [1] 1,677        
Liabilities:          
Reserve for Loan Losses - Unfunded Commitments [4] 6,421        
Equity:          
Retained Earnings [5] (44,820)        
Financing Receivable, Allowance for Credit Losses [2] 54,438        
As previously recorded by acquiree | ASU 2016-13          
Assets:          
Investment Securities - Available for Sale 1,956,047        
Non - Acquired Loans 9,252,831        
Acquired Loans 2,118,940        
Allowance for Credit Losses on Loans (111,365)        
Deferred Tax Asset 43,955        
Accrued Interest Receivable - Loans 30,009        
Liabilities:          
Reserve for Loan Losses - Unfunded Commitments 6,756        
Equity:          
Retained Earnings 635,075        
Financing Receivable, Allowance for Credit Losses 111,365        
Adjustments | ASU 2016-13          
Assets:          
Investment Securities - Available for Sale 1,956,047        
Non - Acquired Loans 9,252,831        
Acquired Loans 2,117,209        
Allowance for Credit Losses on Loans (56,927)        
Deferred Tax Asset 31,316        
Accrued Interest Receivable - Loans 28,332        
Liabilities:          
Reserve for Loan Losses - Unfunded Commitments 335        
Equity:          
Retained Earnings 679,895        
Financing Receivable, Allowance for Credit Losses $ 56,927        
[1] Accrued interest receivable from acquired credit impaired loans of $1,677 was reclassified to other assets and was offset by the reclassification of the grossed up credit discount on acquired credit impaired loans of $3,408 that was moved to the ACL for the purchased credit deteriorated loans.
[2] 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.
[3] 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.
[4] This is the adjustment to the reserve for unfunded commitments related to the adoption of ASC 326.
[5] This is the net adjustment to retained earnings related to the adoption of ASC 326.