Loans and Allowance for Loan Losses (Details) (Non-acquired loans, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Loans and Allowance for Loan Losses
Total loans	$ 2,604,298	$ 2,571,003	$ 2,437,314
Less allowance for loan losses	(41,669)	(44,378)	(47,607)	(49,367)
Loans, net	2,562,629	2,526,625	2,389,707
Commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Total loans	572,195	563,491	578,909
Construction and land development
Loans and Allowance for Loan Losses
Total loans	273,488	273,420	294,865
Less allowance for loan losses	(9,236)	(10,836)	(12,598)	(12,373)
Commercial non-owner occupied
Loans and Allowance for Loan Losses
Total loans	298,707	290,071	284,044
Less allowance for loan losses	(5,271)	(4,921)	(5,662)	(6,109)
Consumer real estate
Loans and Allowance for Loan Losses
Total loans	692,490	689,787	665,751
Consumer owner occupied
Loans and Allowance for Loan Losses
Total loans	443,134	434,503	407,697
Less allowance for loan losses	(6,523)	(6,568)	(7,567)	(7,453)
Home equity loans
Loans and Allowance for Loan Losses
Total loans	249,356	255,284	258,054
Less allowance for loan losses	(3,536)	(3,626)	(4,033)	(4,269)
Commercial owner occupied real estate
Loans and Allowance for Loan Losses
Total loans	796,139	784,152	744,441
Less allowance for loan losses	(8,208)	(8,743)	(9,271)	(10,356)
Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	291,308	279,763	216,083
Less allowance for loan losses	(4,785)	(4,939)	(3,750)	(3,901)
Other income producing property
Loans and Allowance for Loan Losses
Total loans	131,776	133,713	130,177
Less allowance for loan losses	(3,459)	(3,747)	(3,517)	(3,636)
Consumer
Loans and Allowance for Loan Losses
Total loans	93,997	86,934	85,350
Less allowance for loan losses	(434)	(781)	(1,075)	(1,145)
Other loans
Loans and Allowance for Loan Losses
Total loans	26,393	33,163	16,603
Less allowance for loan losses	$ (217)	$ (217)	$ (134)	$ (125)

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-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.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References+ Details