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Agreement with World's Foremost Bank and Capital One Bank (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 17, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business Combination, Separately Recognized Transactions [Line Items]            
Brokered deposits   $ 1,468,308   $ 1,468,308   $ 1,378,983
Transaction fee   0 $ 0 86 $ 0  
World's Foremost Bank (WFB)            
Business Combination, Separately Recognized Transactions [Line Items]            
Brokered deposits   $ 1,100,000   $ 1,100,000    
Capital One            
Business Combination, Separately Recognized Transactions [Line Items]            
Transaction fee $ 75,000          
Deposits portfolio, weighted average cost of funds, percent 1.82%          
Deposits portfolio, weighted average maturity, period 2 years 9 months 15 days