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General - Schedule of Changes in Accounting Principles (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets:              
Held to maturity securities $ 1,721,414     $ 1,227,668      
Loans 9,121,250     9,243,174      
Allowance for credit losses - Loans (199,775) [1] $ (201,082)   (130,648) [1] $ (121,119) $ (99,454) $ (80,284)
Net loans 8,921,475     9,112,526      
Tax asset, deferred and receivable 36,924     12,340      
Liabilities:              
Allowance for credit losses on unfunded loan commitments 20,500 $ 20,500   0      
Stockholder's Equity:              
Retained Earnings 795,666     788,578      
Impact of CECL Adoption              
Assets:              
Held to maturity securities     $ (245)        
Loans     4,776        
Allowance for credit losses - Loans     (74,055) (74,055)      
Net loans     (69,279)        
Tax asset, deferred and receivable     21,984        
Liabilities:              
Allowance for credit losses on unfunded loan commitments $ 20,500   20,500        
Stockholder's Equity:              
Retained Earnings     (68,040)        
January 1, 2021 Post-CECL Adoption              
Assets:              
Held to maturity securities     1,227,423        
Loans     9,247,950        
Allowance for credit losses - Loans     (204,703) $ (204,703)      
Net loans     9,043,247        
Tax asset, deferred and receivable     34,324        
Liabilities:              
Allowance for credit losses on unfunded loan commitments     20,500        
Stockholder's Equity:              
Retained Earnings     $ 720,538        
[1] Beginning January 1, 2021, the amount is based on the current expected credit loss methodology. Prior to January 1, 2021, the amount is based on the incurred loss methodology. See additional details in NOTE 1. GENERAL of these Notes to Consolidated Condensed Financial Statement.