Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 44,600	$ 48,832	$ 57,751	$ 43,736
Available-for-Sale	501,574	478,698	431,010
Held-to-Maturity	248,914	239,803	252,902
Held-to-Maturity Securities, at Fair Value	252,691	248,252	261,574
Federal Home Loan Bank and Federal Reserve Bank Stock	6,136	5,792	4,479
Net Loans	1,190,056	1,157,043	1,131,430
Accrued Interest Receivable	5,708	5,486	5,712
Deposits	1,779,905	1,731,155	1,704,883
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	14,738	12,678	16,097
Federal Home Loan Bank Term Advances	30,000	30,000	30,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	493	584	898
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	44,600	48,832	57,751
Available-for-Sale	501,574	478,698	431,010
Held-to-Maturity	248,914	239,803	252,902
Federal Home Loan Bank and Federal Reserve Bank Stock	6,136	5,792	4,479
Net Loans	1,190,056	1,157,043	1,131,430
Accrued Interest Receivable	5,708	5,486	5,712
Deposits	1,779,905	1,731,155	1,704,883
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	14,738	12,678	16,097
Federal Home Loan Bank Term Advances	70,000	59,000	30,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	493	584	898
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	44,600	48,832	57,751
Available-for-Sale	501,574	478,698	431,010
Held-to-Maturity Securities, at Fair Value	252,691	248,252	261,574
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	6,136	5,792	4,479
Net Loans, Fair Value Disclosure	1,198,430	1,192,628	1,156,811
Accrued Interest Receivable, Fair Value Disclosure	5,708	5,486	5,712
Deposits, Fair Value Disclosure	1,776,590	1,732,894	1,708,994
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	14,738	12,678	16,097
Federal Home Loan Bank Term Advances, Fair Value Disclosure	70,267	60,312	31,269
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	493	584	898
Quoted Prices In Active Markets for Indentical Assets (Level 1) [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	44,600	48,832	57,751
Available-for-Sale	0	0	249
Held-to-Maturity Securities, at Fair Value	0	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	6,136	5,792	4,479
Net Loans, Fair Value Disclosure	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	5,708	5,486	5,712
Deposits, Fair Value Disclosure	1,510,867	1,447,882	1,380,904
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	14,738	12,678	16,097
Federal Home Loan Bank Term Advances, Fair Value Disclosure	40,000	29,000	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0	0
Accrued Interest Payable, Fair Value Disclosure	493	584	898
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0	0
Available-for-Sale	501,574	478,698	430,761
Held-to-Maturity Securities, at Fair Value	252,691	248,252	261,574
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	0	0	0
Net Loans, Fair Value Disclosure	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	0	0	0
Deposits, Fair Value Disclosure	265,723	285,012	328,090
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	0	0	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	30,267	31,312	31,269
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	0	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0	0
Available-for-Sale	0	0	0
Held-to-Maturity Securities, at Fair Value	0	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	0	0	0
Net Loans, Fair Value Disclosure	1,198,430	1,192,628	1,156,811
Accrued Interest Receivable, Fair Value Disclosure	0	0	0
Deposits, Fair Value Disclosure	0	0	0
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	0	0	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0	0
Accrued Interest Payable, Fair Value Disclosure	$ 0	$ 0	$ 0