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Time Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Time deposits, $100,000 or more $ 1,443,000 $ 736,000
Time deposits, at or above FDIC insurance limit 753,200 396,800
Interest-bearing domestic deposit, brokered 1,386,000 $ 442,000
Time deposit maturities, next twelve months 2,384,000  
Time deposit maturities, year two 407,920  
Time deposit maturities, year three 83,740  
Time deposit maturities, year four 13,470  
Time deposit maturities, year five 6,940  
Time deposit maturities, thereafter $ 85