Covered Loans Receivable (Accretable Yield) (Details) (Covered Loans, USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		May 01, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of the year	$ 9,535,000		$ 14,286,000		$ 19,912,000
Accretion	(3,749,000)		(4,210,000)		(6,679,000)
Disposal and other	(1,718,000)		(4,902,000)		(1,140,000)
Change in accretable yield	4,452,000	[1]	4,361,000	[1]	2,193,000	[1]
Balance at the end of the year	8,520,000		9,535,000		14,286,000
Washington Banking
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of the year							3,500,000
Balance at the end of the year							3,500,000
Contractual cash flows on loans acquired							75,100,000
Expected cash flows on loans acquired							52,200,000
Non-accretable difference							22,900,000
Estimated fair value of loans acquired							48,700,000
Washington Banking | Non-PCI Loans
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Contractual cash flows on loans acquired							70,300,000
Expected cash flows on loans acquired							66,500,000
Non-accretable difference							3,800,000
Estimated fair value of loans acquired							$ 58,400,000

[1] Includes accretable difference at acquisition.