Loans (Textual) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($) Segment Loans BaordOfDirectors Tenants	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality	$ 0	$ 0	$ 500	$ 500
Loans (Textual) [Abstract]
Number of portfolio segment | Segment		2
Number of classes of loans | Loans		7
Number of minimum tenants under lease of non-owner occupied commercial real estate | Tenants		1
Number of members of the board of directors in loan committee | BaordOfDirectors		8
Minimum due period of loans consider in a nonperforming status		90 days
Total nonaccrual TDR loans	35,700	$ 35,700	37,200	43,700
Difference between recorded investment and unpaid principal balance of loan	30,200	30,200	30,600	21,900
Confirmed losses (partial charge-offs)	15,200	15,200	15,400	18,200
Fair value of discount adjustment	15,000	15,000	15,200	3,700
Acquired impaired loans	15,900	15,900	19,900	10,400
Performing trouble debt restructuring under impaired loans	45,800	45,800	45,700	44,100
Financing receivable allowance for acquired loans			500	500
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference		0
Residential Mortgage Loans in Process of Foreclosure	2,000	2,000	2,300	3,600
Commercial Loan Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality	0	0	0	0
Loans (Textual) [Abstract]
Minimum value of loan requires executive and senior officer approval	1,500	1,500
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality	0	$ 0	$ 500	$ 500
Loans (Textual) [Abstract]
Maximum due period of loans consider in performing status		90 days
Minimum due period of loans consider in a nonperforming status		90 days
Commercial [Member]
Loans (Textual) [Abstract]
Minimum value of loan requires group loan authority approval	1,000	$ 1,000
Maximum value of loan requires executive and senior officer approval	3,500	$ 3,500
Increase in Minimum Value of Loans Requiring Group Loan Authority Approval	5,000
Real Estate Residential Loans [Member]
Loans (Textual) [Abstract]
Period for loan secured under real estate residential security		15 years
Loan-to-value ratio at the time of origination		80.00%
Land Development Loans [Member]
Loans (Textual) [Abstract]
Maximum period for payment of loan		12 months
Maximum [Member] | Commercial Loan Portfolio [Member]
Loans (Textual) [Abstract]
Maximum value of loan requires group loan authority approval	10,000	$ 10,000
Other loans requiring director loan committee approval depending on risk rating and credit action required	10,000	$ 10,000
Maximum [Member] | Real Estate Residential Loans [Member]
Loans (Textual) [Abstract]
Upper limit of number of family residential properties | Tenants		4
Minimum [Member] | Commercial Loan Portfolio [Member]
Loans (Textual) [Abstract]
Minimum value of loan requires group loan authority approval	1,000	$ 1,000
Minimum value of loans depending on risk rating and requires credit action from board of directors	15,000	15,000
Minimum [Member] | Commercial [Member]
Loans (Textual) [Abstract]
Minimum value of loans requiring only director loan committee approval	$ 10,000	$ 10,000
Minimum [Member] | Real Estate Residential Loans [Member]
Loans (Textual) [Abstract]
Lower limit of number of family residential properties | Tenants		1