FDIC Loss-sharing Asset and Covered Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	$ 5,154				$ 4,200				$ 5,154	$ 4,200
Provision (recapture) for loan and lease losses	2,349	$ 2,831	$ 2,202	$ 1,209	1,708	$ 980	$ 2,117	$ 1,922	8,591	6,727	$ (101)
Federal deposit insurance corporation loss-sharing indemnified assets	6,000				13,100				6,000	13,100
Federal deposit insurance corporation loss-sharing indemnified assets receivable	605				2,100				605	2,100
FDIC Indemnification Asset	6,568				$ 15,174				6,568	15,174
FDIC Loss-sharing Asset, Write-downs of Other Real Estate									1,158	$ 1,065
Non-Single Family Covered Assets	110,819								110,819
Single Family Covered Assets	$ 39,022								$ 39,022
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%
Percentage of loss shared by FDIC	80.00%								80.00%
FDIC Percentage Of Loss Recoveries	80.00%				95.00%				80.00%	95.00%
Fdic Loss Sharing Asset [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
FDIC Indemnification Asset	$ 6,568				$ 15,174				$ 6,568	$ 15,174	$ 39,846
FDIC Loss-sharing Asset, Cash Payments Received									2,794	2,499
FDIC Loss-sharing Asset, Net Reimbursable Losses									(1,802)	(2,184)
FDIC Loss-sharing Asset, Amortization, Net									(6,184)	(21,279)
FDIC Loss-sharing Asset, Impairment (Recapture) of Loans									2,268	2,301
FDIC Loss-sharing Asset, Disposals									1,237	2,179
FDIC Loss-sharing Asset, Other									(15)	$ 103
Columbia River Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	3,248								3,248
FDIC Indemnification Asset	130								130
Non-Single Family Covered Assets	73,707								73,707
Single Family Covered Assets	8,114								8,114
American Marine Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	1,227								1,227
FDIC Indemnification Asset	2,598								2,598
Non-Single Family Covered Assets	12,111								12,111
Single Family Covered Assets	22,962								22,962
Summit Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	0								0
FDIC Indemnification Asset	1,886								1,886
Non-Single Family Covered Assets	9,405								9,405
Single Family Covered Assets	6,180								6,180
First Heritage Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	679								679
FDIC Indemnification Asset	1,954								1,954
Non-Single Family Covered Assets	15,596								15,596
Single Family Covered Assets	$ 1,766								$ 1,766