Intangible Assets and Goodwill (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of intangible assets
Gross Carrying Amount	$ 21,312	$ 21,557
Accumulated Amortization	(9,229)	(7,338)
Net Carrying Amount	12,083	14,219
Core deposit intangibles [Member]
Summary of intangible assets
Gross Carrying Amount	14,800	14,800
Accumulated Amortization	(7,142)	(5,662)
Net Carrying Amount	7,658	9,138
Customer relationship intangibles [Member]
Summary of intangible assets
Gross Carrying Amount	5,657	5,657
Accumulated Amortization	(1,986)	(1,639)
Net Carrying Amount	3,671	4,018
Mortgage Servicing Intangibles [Member]
Summary of intangible assets
Gross Carrying Amount	855	1,100
Accumulated Amortization	(101)	(37)
Net Carrying Amount	$ 754	$ 1,063

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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