Advances Advances Prepayment Fees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Federal Home Loan Bank Advances Prepayment Fees [Abstract]
Prepayment fees received from borrowers	$ 838	$ 26,186
Hedging fair-value adjustments on prepaid advances	0	527
Net discounts associated with prepaid advances	0	218
Advance prepayment fees recognized in income, net	$ 838	$ 26,931