Subsequent Events (Details) - Scenario, Forecast - Bank Of America, Branch Locations $ in Millions	1 Months Ended
Mar. 31, 2016 USD ($) location
Subsequent Event [Line Items]
Branch deposits \| $	$ 480
Balance of deposits, percentage acquired	2.00%
OREGON
Subsequent Event [Line Items]
Number of businesses acquired	12
WASHINGTON
Subsequent Event [Line Items]
Number of businesses acquired	3

The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financial Liability
-URI http://asc.fasb.org/extlink&oid=6513127

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant