Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (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]
Balance at beginning of period	$ 3,239	$ 5,954	$ 3,535	$ 6,568
Cash paid to (received from) the FDIC, net	0	(396)	184	(43)
FDIC reimbursable losses, net	57	(302)	(149)	(166)
FDIC indemnification asset settlement	(3,123)	0	(3,123)	0
Amortization, net	(99)	(883)	(414)	(2,215)
Loan impairment (recapture)	0	(20)	40	127
Sale of other real estate	11	(24)	18	120
Valuation adjustments of other real estate owned	0	(40)	0	(22)
Other	85	23	91	103
Balance at end of period	$ 0	$ 4,266	$ 0	$ 4,266
Non-Single Family Covered Assets					$ 74,000
Single Family Covered Assets					$ 26,400