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Short-Term Borrowings and Long-Term Debt Short Term (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Short-term Debt [Line Items]      
Maximum borrowing capacity $ 1,300,000    
Short-term borrowings 754,777 $ 617,524 $ 541,317
Collateralized borrowings availability at discount window 505,200 600,000  
Federal funds purchased      
Short-term Debt [Line Items]      
Short-term borrowings 0 220,000 278,570
Maximum month-end outstanding amount 525,000 387,110 449,184
Short-term FHLB advances      
Short-term Debt [Line Items]      
Short-term borrowings 385,000 0 0
Maximum month-end outstanding amount 385,000 250,000 0
Customer repurchase agreements      
Short-term Debt [Line Items]      
Short-term borrowings 43,500 172,017 195,734
Maximum month-end outstanding amount 181,989 233,274 221,989
Customer short-term promissory notes      
Short-term Debt [Line Items]      
Short-term borrowings 326,277 225,507 67,013
Maximum month-end outstanding amount $ 365,689 $ 237,298 $ 77,887