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Subsequent Event (Details) - USD ($)
$ in Thousands
Apr. 17, 2017
Mar. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]      
Brokered deposits   $ 1,388,153 $ 1,378,983
Subsequent Event [Member] | World's Foremost Bank (WFB) [Member]      
Subsequent Event [Line Items]      
Brokered deposits $ 1,200,000    
Subsequent Event [Member] | Capital One [Member]      
Subsequent Event [Line Items]      
Services fee $ 75,000    
Deposits portfolio, weighted average cost of funds, percent 1.85%    
Deposits portfolio, weighted average maturity, period 2 years 9 months