Covered Assets and FDIC Loss-sharing Asset (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Payment to FDIC to terminate loss-sharing agreements	$ 4,700		$ (4,666)	$ 0
FDIC indemnification asset settlement	3,123	$ 0	3,123	0
FDIC clawback liability removal upon termination of loss-sharing agreements	5,400
FDIC loss-sharing agreement early termination, pretax charge	$ 2,400		$ 2,409	$ 0
Non-Single Family Covered Assets					$ 74,000
Single Family Covered Assets					$ 26,400