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Loans - USAB Acquisition (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Business Combination, Separately Recognized Transactions [Line Items]              
Interest component of expected cash flows (accretable yield) $ (600,166) $ (630,550)   $ (282,009) $ (225,652) $ (246,278) $ (294,514)
USAmeriBancorp, Inc.              
Business Combination, Separately Recognized Transactions [Line Items]              
Contractually required principal and interest     $ 4,312,988        
Contractual cash flows not expected to be collected (non-accretable difference)     (103,618)        
Expected cash flows to be collected     4,209,370        
Interest component of expected cash flows (accretable yield)     (474,208)        
Fair value of acquired loans     $ 3,735,162