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Summary of Significant Accounting Policies - Impact of ASU (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Assets:      
Securities available-for-sale, at fair value   $ 3,330,672 $ 1,956,047
Investment Securities - Held to Maturity   955,542  
Non - Acquired Loans   24,664,134 11,375,104
Allowance for credit losses $ (54,400) (457,309) (56,927)
Deferred tax assets   110,946 31,316
Accrued Interest Receivable - Loans   93,900  
Liabilities:      
Reserve for Loan Losses - Unfunded Commitments   457,309 56,927
Equity:      
Retained Earnings (Accumulated Deficit)   657,451 679,895
Credit Discount on Acquired Credit Impaired Loans 3,408    
Financing Receivable, Allowance for Credit Losses $ 54,400 457,309 56,927
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 22.00%    
Non-acquired loans      
Assets:      
Allowance for credit losses $ (34,049)    
Equity:      
Financing Receivable, Allowance for Credit Losses 34,049    
Acquired loans      
Assets:      
Allowance for credit losses (16,981)    
Equity:      
Financing Receivable, Allowance for Credit Losses 16,981    
Purchased Credit Deteriorated Loans [Member]      
Assets:      
Allowance for credit losses (3,408)    
Equity:      
Financing Receivable, Allowance for Credit Losses 3,408    
ASU 2016-13      
Assets:      
Acquired Loans 1,723    
Allowance for credit losses (54,438)    
Deferred tax assets 12,639    
Accrued Interest Receivable - Loans 1,677    
Liabilities:      
Reserve for Loan Losses - Unfunded Commitments 6,421    
Equity:      
Retained Earnings (Accumulated Deficit) (44,820) 44,800  
Financing Receivable, Allowance for Credit Losses 54,438    
As previously recorded by acquiree | ASU 2016-13      
Assets:      
Securities available-for-sale, at fair value 1,956,047    
Non - Acquired Loans 9,252,831    
Acquired Loans 2,118,940    
Allowance for credit losses (111,365)    
Deferred tax assets 43,955    
Accrued Interest Receivable - Loans 30,009    
Liabilities:      
Reserve for Loan Losses - Unfunded Commitments 6,756    
Equity:      
Retained Earnings (Accumulated Deficit) 635,075    
Financing Receivable, Allowance for Credit Losses 111,365    
Adjustments      
Assets:      
Allowance for credit losses     (111,365)
Equity:      
Financing Receivable, Allowance for Credit Losses     111,365
Adjustments | ASU 2016-13      
Assets:      
Securities available-for-sale, at fair value 1,956,047    
Non - Acquired Loans 9,252,831    
Acquired Loans 2,117,209    
Allowance for credit losses (56,927) (109,442) (51,030)
Deferred tax assets 31,316    
Accrued Interest Receivable - Loans 28,332    
Liabilities:      
Reserve for Loan Losses - Unfunded Commitments 335    
Equity:      
Retained Earnings (Accumulated Deficit) 679,895    
Financing Receivable, Allowance for Credit Losses $ 56,927 $ 109,442 $ 51,030