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General - Schedule of Changes in Accounting Principles (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets:          
Held to maturity securities $ 1,295,534   $ 1,227,668    
Loans 9,318,228   9,243,174    
Less: Allowance for credit losses - loans (201,082) [1]   (130,648) [1] $ (99,454) $ (80,284)
Net loans 9,117,146   9,112,526    
Tax asset, deferred and receivable 40,163   12,340    
Liabilities:          
Allowance for credit losses on unfunded loan commitments 20,500   0    
Stockholder's Equity:          
Retained earnings 755,877   788,578    
Impact of CECL Adoption          
Assets:          
Held to maturity securities   $ (245)      
Loans   4,776      
Less: 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 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      
Less: 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 calculation is based on the current expected credit loss methodology. Prior to January 1, 2021, the calculation is based on the incurred loss methodology. See additional details in NOTE 1. GENERAL of these Notes to Consolidated Condensed Financial Statement.