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Significant Accounting Policies - CECL (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for credit losses $ (52,162) $ (176,144) $ (49,026) $ (46,211)
Deferred tax assets, net 27,282 44,665    
Remaining purchase discount on loans (50,958)      
Reserve for unfunded commitments 946 20,535    
Retained earnings 617,355 $ 615,773    
Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for credit losses (42,484)      
Deferred tax assets, net 12,305      
Remaining purchase discount on loans 5,469      
Reserve for unfunded commitments 10,389      
Retained earnings (35,099)      
Cumulative Effect, Period of Adoption, Adjusted Balance        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for credit losses (94,646)      
Deferred tax assets, net 39,587      
Remaining purchase discount on loans (45,489)      
Reserve for unfunded commitments 11,335      
Retained earnings $ 582,256