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Time Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Time deposits, $100,000 or more $ 2,150,000 $ 1,440,000
Time deposits, at or above FDIC insurance limit 837,300 753,200
Interest-bearing domestic deposit, brokered 1,060,000 $ 1,390,000
Time deposit maturities, next twelve months 2,600,000  
Time deposit maturities, year two 492,430  
Time deposit maturities, year three 112,030  
Time deposit maturities, year four 47,200  
Time deposit maturities, year five 16,820  
Time deposit maturities, thereafter $ 4,470