Loans (Textual) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Segment Loans BaordOfDirectors Tenants employee	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual TDRs Reported in Nonaccrual Loans	$ 35,900	$ 37,200
Number of portfolio segment | Segment	2
Number of classes of loans | Loans	7
Minimum number of tenants leased to for non-owner occupied real estate | Tenants	1
Loans held-for-sale, at fair value	$ 10,327	9,128
Number of bank executives and senior officers with credit decision limits similar to group loan authorities | employee	6
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
Interest income recognized on nonaccrual loans while in accruing status	$ 900	500	$ 900
Interest lost on nonaccrual loans	3,200	3,300	3,500
Interest income recognized on TDRs	3,900	3,600	3,200
Difference between recorded investment and unpaid principal balance of loan	25,300	30,600
Confirmed losses (partial charge-offs)	17,100	15,400
Fair value of discount adjustment	8,200	15,200
Financing receivable allowance for acquired loans	500
Residential Mortgage Loans in Process of Foreclosure	2,900	2,300
Management [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to directors, executive officers and affiliates	21,700	31,200
Loans to directors, executive officers and affiliates, current year additions	33,300	39,300
Loans to directors, executive officers and affiliates, current year reductions	42,800	34,900
Commercial Loan Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum value of loan requires executive and senior officer approval	1,500
Minimum value of loan requires group loan authority approval	1,000
Maximum value of loan requires group loan authority approval	$ 10,000
Minimum due period of loans consider in a nonperforming status	90 days
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Original contractual terms	90 days
Minimum due period of loans consider in a nonperforming status	90 days
Acquired Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Loans	$ 12,800	19,900
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum value of loan requires group loan authority approval	1,000
Maximum value of loan requires executive and senior officer approval	$ 3,500
Real Estate Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period for loan secured under real estate residential security	15 years
Loan-to-value ratio at the time of origination	80.00%
Loans held-for-sale, recorded investment sold	$ 223,000	149,000
Land Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum period for payment of loan	12 months
Maximum [Member] | Commercial Loan Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other loans requiring director loan committee approval depending on risk rating and credit action required	$ 10,000
Maximum [Member] | Real Estate Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Upper limit of number of family residential properties | Tenants	4
Minimum [Member] | Commercial Loan Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum value of loans requiring board of directors approval	$ 15,000
Minimum [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum value of loan requiring director loan committee approval	$ 10,000
Minimum [Member] | Real Estate Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lower limit of number of family residential properties | Tenants	1
Fixed-Rate Real Estate Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale, at fair value	$ 10,300	9,100
Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Loans	47,800	45,700
Total Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Average Recorded Investment	135,730	127,876	121,000
Impaired Financing Receivable, Interest Income, Accrual Method	4,940	4,353	3,800
Impaired Loans	142,198	134,667
Total Impaired Loans [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Average Recorded Investment	41,683	41,137	29,600
Impaired Financing Receivable, Interest Income, Accrual Method	1,303	1,375	1,000
Impaired Loans	49,937	39,060
Total Impaired Loans [Member] | Real Estate Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Average Recorded Investment	29,126	26,745	26,800
Impaired Financing Receivable, Interest Income, Accrual Method	1,477	1,267	1,100
Impaired Loans	28,675	27,675
Total Impaired Loans [Member] | Land Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1,768	3,551	9,800
Impaired Financing Receivable, Interest Income, Accrual Method	104	131	300
Impaired Loans	1,736	1,928
Total Impaired Loans [Member] | Real Estate Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Average Recorded Investment	59,480	53,375	50,800
Impaired Financing Receivable, Interest Income, Accrual Method	1,985	1,567	1,300
Impaired Loans	57,966	63,203
Total Impaired Loans [Member] | Real Estate Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Average Recorded Investment	457	164	400
Impaired Financing Receivable, Interest Income, Accrual Method	11	0
Impaired Loans	400	162
Total Impaired Loans [Member] | Consumer Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Average Recorded Investment	480	602	700
Impaired Financing Receivable, Interest Income, Accrual Method	2	1
Impaired Loans	498	518
Total Impaired Loans [Member] | Home Equity Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,736	2,302	$ 2,900
Impaired Financing Receivable, Interest Income, Accrual Method	58	12
Impaired Loans	$ 2,986	$ 2,121