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Loans - USAB Acquisition (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Combination, Separately Recognized Transactions [Line Items]        
Interest component of expected cash flows (accretable yield) $ (875,958)   $ (282,009) $ (294,514)
USAmeriBancorp, Inc.        
Business Combination, Separately Recognized Transactions [Line Items]        
Contractually required principal and interest   $ 4,398,687    
Contractual cash flows not expected to be collected (non-accretable difference)   (101,796)    
Expected cash flows to be collected   4,296,891    
Interest component of expected cash flows (accretable yield)   (559,907)    
Fair value of acquired loans   $ 3,736,984