Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at beginning of period	$ 14,644	$ 36,837	$ 15,174	$ 39,846
Cash received from the FDIC	(2,862)	(3,442)	(3,522)	(1,765)
FDIC reimbursable losses, net	(944)	(364)	(964)	(231)
Amortization, net	(1,376)	(5,764)	(3,670)	(12,216)
Impairment	1	1,214	1,532	3,151
Sale of other real estate	(208)	(965)	(627)	(1,721)
Write-downs of other real estate	52	276	1,124	792
Other	37	189	297	125
Balance at end of period	9,344	$ 27,981	9,344	$ 27,981
Amount of Estimated Clawback Liability	4,167		4,167
Non-Single Family Covered Assets	146,614		146,614
Single Family Covered Assets	43,540		43,540
Columbia River Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at end of period	470		470
Amount of Estimated Clawback Liability	4,040		4,040
Non-Single Family Covered Assets	98,008		98,008
Single Family Covered Assets	9,087		9,087
American Marine Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at end of period	3,158		3,158
Amount of Estimated Clawback Liability	127		127
Non-Single Family Covered Assets	14,209		14,209
Single Family Covered Assets	25,839		25,839
Summit Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at end of period	3,585		3,585
Amount of Estimated Clawback Liability	0		0
Non-Single Family Covered Assets	13,247		13,247
Single Family Covered Assets	6,432		6,432
First Heritage Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at end of period	2,131		2,131
Amount of Estimated Clawback Liability	0		0
Non-Single Family Covered Assets	21,150		21,150
Single Family Covered Assets	$ 2,182		$ 2,182