FDIC Loss-sharing Asset and Covered Assets (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	$ 4,174,000				$ 3,900,000				$ 4,174,000	$ 3,900,000
Provision (recapture) for loan and lease losses	1,708,000	980,000	2,117,000	1,922,000	(3,682,000)	3,313,000	288,000	(20,000)	6,727,000	(101,000)	39,367,000
Federal deposit insurance corporation loss-sharing indemnified assets	13,100,000				37,900,000				13,100,000	37,900,000
Federal deposit insurance corporation loss-sharing indemnified assets receivable	2,100,000				2,000,000				2,100,000	2,000,000
Writedowns Previously Recorded On Transfer In Of Real Estate Acquired Through Foreclosure									0	90,000
FDIC Indemnification Asset	15,174,000				39,846,000				15,174,000	39,846,000
FDIC Loss-sharing Asset, Write-downs of Other Real Estate									1,065,000	364,000
Non-Single Family Covered Assets	174,847,000								174,847,000
Single Family Covered Assets	46,799,000								46,799,000
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	15,174,000				39,846,000				15,174,000	39,846,000	96,354,000
FDIC Loss-sharing Asset, Cash Payments Received									2,499,000	9,246,000
FDIC Loss-sharing Asset, Net Reimbursable Losses									(2,184,000)	(2,245,000)
FDIC Loss-sharing Asset, Amortization, Net									(21,279,000)	(36,729,000)
FDIC Loss-sharing Asset, Impairment (Recapture) of Loans									2,301,000	(2,609,000)
FDIC Loss-sharing Asset, Disposals									2,179,000	6,177,000
FDIC Loss-sharing Asset, Other									103,000	134,000
Columbia River Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	4,017,000								4,017,000
FDIC Indemnification Asset	1,183,000								1,183,000
Non-Single Family Covered Assets	115,230,000								115,230,000
Single Family Covered Assets	11,166,000								11,166,000
American Marine Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	157,000								157,000
FDIC Indemnification Asset	4,927,000								4,927,000
Non-Single Family Covered Assets	17,984,000								17,984,000
Single Family Covered Assets	26,587,000								26,587,000
Summit Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	0								0
FDIC Indemnification Asset	4,712,000								4,712,000
Non-Single Family Covered Assets	14,352,000								14,352,000
Single Family Covered Assets	6,530,000								6,530,000
First Heritage Bank [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of estimated clawback liability	0								0
FDIC Indemnification Asset	4,352,000								4,352,000
Non-Single Family Covered Assets	27,281,000								27,281,000
Single Family Covered Assets	$ 2,516,000								$ 2,516,000