Repurchase Agreements and Other Advances - FHLB Advances (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
FHLB advances, long-term	$ 265,000
FHLB advances, weighted average borrowing rate	0.26%
FHLB advances, weighted average term to maturity	4 years 10 months 13 days
Accrued interest payable	$ 15,028	$ 13,095
Federal Home Loan Bank Advances
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Accrued interest payable	$ 18