FDIC Loss-sharing Asset and Covered Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Payment Of Clawback If Losses Less Than Stated Levels, Period After Acquisition									10 years 45 days
Amount of estimated clawback liability	$ 5,433				$ 5,200				$ 5,433	$ 5,200
Provision for loan and lease losses	18	$ 1,866	$ 3,640	$ 5,254	2,349	$ 2,831	$ 2,202	$ 1,209	10,778	8,591	$ 6,727
Federal deposit insurance corporation loss-sharing indemnified assets	2,700				6,000				2,700	6,000
Federal deposit insurance corporation loss-sharing indemnified assets receivable	794				605				794	605
FDIC Indemnification Asset	3,535				6,568				3,535	6,568
FDIC Loss-sharing Asset, Write-downs of Other Real Estate									(22)	1,158
Non-Single Family Covered Assets	83,179								83,179
Single Family Covered Assets	$ 30,506								$ 30,506
Maximum [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loss Recovery Provision Effective Years									10 years
Loss Sharing Agreement Effective Years									10 years
Minimum [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loss Recovery Provision Effective Years									8 years
Loss Sharing Agreement Effective Years									5 years
Covered Loans [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Percentage of loss shared by FDIC When Loss Share Thresholds Met	95.00%								95.00%
FDIC Percentage Of Loss Recoveries When Loss Share Thresholds Met	95.00%								95.00%
Percentage of loss shared by FDIC	80.00%								80.00%
FDIC Percentage Of Loss Recoveries	80.00%								80.00%
Fdic Loss Sharing Asset [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
FDIC Indemnification Asset	$ 3,535				$ 6,568				$ 3,535	6,568	$ 15,174
FDIC Loss-sharing Asset, Cash Payments Received									(705)	2,794
FDIC Loss-sharing Asset, Net Reimbursable Losses									(1,153)	(1,802)
FDIC Loss-sharing Asset, Amortization, Net									(2,829)	(6,184)
FDIC Loss-sharing Asset, Impairment (Recapture) of Loans									301	2,268
FDIC Loss-sharing Asset, Disposals									(148)	1,237
FDIC Loss-sharing Asset, Other									(183)	$ (15)
Columbia River Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	3,433								3,433
FDIC Indemnification Asset	101								101
Non-Single Family Covered Assets	57,017								57,017
Single Family Covered Assets	6,121								6,121
American Marine Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	1,269								1,269
FDIC Indemnification Asset	1,866								1,866
Non-Single Family Covered Assets	9,059								9,059
Single Family Covered Assets	18,517								18,517
Summit Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	0								0
FDIC Indemnification Asset	1,426								1,426
Non-Single Family Covered Assets	5,066								5,066
Single Family Covered Assets	4,420								4,420
First Heritage Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	731								731
FDIC Indemnification Asset	142								142
Non-Single Family Covered Assets	12,037								12,037
Single Family Covered Assets	$ 1,448								$ 1,448