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Summary of Significant Accounting Policies - Impact of ASU (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets:          
Investment Securities - Available for Sale   $ 5,193,478 $ 3,330,672    
Investment Securities - Held to Maturity   1,819,901 955,542    
Non - Acquired Loans   23,928,166 24,664,134    
Allowance for Credit Losses on Loans $ (54,400) (301,807) (457,309) $ (56,927)  
Deferred Tax Asset   64,964 110,946    
Accrued Interest Receivable - Loans   70,600 93,900    
Liabilities:          
Reserve for Loan Losses - Unfunded Commitments   301,807 457,309    
Equity:          
Retained Earnings   997,657 657,451    
Credit Discount on Acquired Credit Impaired Loans 3,408        
Financing Receivable, Allowance for Credit Losses $ 54,400 301,807 457,309 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 1,723        
Allowance for Credit Losses on Loans (54,438)        
Deferred Tax Asset 12,639        
Accrued Interest Receivable - Loans 1,677        
Liabilities:          
Reserve for Loan Losses - Unfunded Commitments 6,421        
Equity:          
Retained Earnings (44,820) 44,800      
Financing Receivable, Allowance for Credit Losses 54,438        
Other Assets          
Assets:          
Accrued Interest Receivable - Loans   $ 70,600 93,900    
Other Assets | ASU 2016-13          
Assets:          
Accrued Interest Receivable - Loans 1,677        
As previously recorded by acquiree          
Assets:          
Allowance for Credit Losses on Loans       (61,991) $ (55,798)
Equity:          
Financing Receivable, Allowance for Credit Losses       61,991 $ 55,798
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          
Assets:          
Allowance for Credit Losses on Loans     (457,309) (111,365)  
Equity:          
Financing Receivable, Allowance for Credit Losses     457,309 111,365  
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)   (109,442) (51,030)  
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   $ 109,442 $ 51,030