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Acquisition - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 06, 2019
Apr. 03, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Net of Cash Acquired     $ 0 $ (332,468) $ (705)
Merger and acquisition related     0 3,536 $ 1,637
Goodwill     303,328 $ 303,328  
Santander Bank, N.A. [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Net of Cash Acquired   $ 329,533      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 112,913        
Business Combination, Acquired Receivables, Gross Contractual Amount 101,200        
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits 471,386        
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits Gross 471,000        
Goodwill, Acquired During Period 29,126        
Merger and acquisition related     $ 3,700    
Loans 99,956        
Business Combination, Acquired Receivables, Fair Value Adjustment 1,200        
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits Fair Value Adj 400        
Core deposit intangible $ 5,615