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Short-Term Borrowings and Long-Term Debt Short Term (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]      
Maximum borrowing capacity $ 1,200,000    
Short-term borrowings 617,524 $ 541,317 $ 497,663
Collateralized borrowings availability at discount window 617,400 1,200,000  
Federal funds purchased      
Short-term Debt [Line Items]      
Short-term borrowings 220,000 278,570 197,235
Maximum month-end outstanding amount 387,110 449,184 266,338
Short-term FHLB advances      
Short-term Debt [Line Items]      
Short-term borrowings 0 0 110,000
Maximum month-end outstanding amount 250,000 0 200,000
Customer repurchase agreements      
Short-term Debt [Line Items]      
Short-term borrowings 172,017 195,734 111,496
Maximum month-end outstanding amount 233,274 221,989 212,509
Customer short-term promissory notes      
Short-term Debt [Line Items]      
Short-term borrowings 225,507 67,013 78,932
Maximum month-end outstanding amount $ 237,298 $ 77,887 $ 93,176