Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at beginning of period	$ 9,344	$ 27,981	$ 15,174	$ 39,846
Cash (received from) paid to the FDIC, net	799	541	(2,723)	(1,223)
FDIC reimbursable losses, net	(362)	(214)	(1,326)	(446)
Amortization, net	(1,416)	(3,992)	(5,086)	(16,208)
Loan impairment	(119)	(416)	1,413	2,735
Sale of other real estate	(126)	(383)	(753)	(2,104)
Write-downs of other real estate	25	67	1,148	860
Other	(1)	92	(299)	(32)
Balance at end of period	8,146	$ 23,492	8,146	$ 23,492
Amount of Estimated Clawback Liability	4,341		4,341
Non-Single Family Covered Assets	122,271		122,271
Single Family Covered Assets	41,540		41,540
Columbia River Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at end of period	360		360
Amount of Estimated Clawback Liability	4,141		4,141
Non-Single Family Covered Assets	80,921		80,921
Single Family Covered Assets	8,388		8,388
American Marine Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at end of period	2,879		2,879
Amount of Estimated Clawback Liability	200		200
Non-Single Family Covered Assets	12,680		12,680
Single Family Covered Assets	24,658		24,658
Summit Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at end of period	2,997		2,997
Amount of Estimated Clawback Liability	0		0
Non-Single Family Covered Assets	11,767		11,767
Single Family Covered Assets	6,277		6,277
First Heritage Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at end of period	1,910		1,910
Amount of Estimated Clawback Liability	0		0
Non-Single Family Covered Assets	16,903		16,903
Single Family Covered Assets	$ 2,217		$ 2,217