Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 72,052	$ 48,832	$ 136,418	$ 43,736
Available-for-Sale	486,888	478,698	425,416
Held-to-Maturity	273,626	239,803	244,949
Held-to-Maturity Securities, at Fair Value	278,390	248,252	254,936
Federal Home Loan Bank and Federal Reserve Bank Stock	3,896	5,792	4,487
Net Loans	1,228,786	1,157,043	1,137,704
Accrued Interest Receivable	6,614	5,486	6,510
Deposits	1,895,375	1,731,155	1,771,461
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	15,977	12,678	18,042
Federal Home Loan Bank Term Advances	20,000	30,000	30,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	472	584	676
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	72,052	48,832	136,418
Available-for-Sale	486,888	478,698	425,416
Held-to-Maturity	273,626	239,803	244,949
Federal Home Loan Bank and Federal Reserve Bank Stock	3,896	5,792	4,487
Net Loans	1,228,786	1,157,043	1,137,704
Accrued Interest Receivable	6,614	5,486	6,510
Deposits	1,895,375	1,731,155	1,771,461
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	15,977	12,678	18,042
Federal Home Loan Bank Term Advances	20,000	59,000	30,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	472	584	676
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	72,052	48,832	136,418
Available-for-Sale	486,888	478,698	425,416
Held-to-Maturity Securities, at Fair Value	278,390	248,252	254,936
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	3,896	5,792	4,487
Net Loans, Fair Value Disclosure	1,246,005	1,192,628	1,164,743
Accrued Interest Receivable, Fair Value Disclosure	6,614	5,486	6,510
Deposits, Fair Value Disclosure	1,891,086	1,732,894	1,774,549
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	15,977	12,678	18,042
Federal Home Loan Bank Term Advances, Fair Value Disclosure	20,823	60,312	31,513
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	472	584	676
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	72,052	48,832	136,418
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	3,896	5,792	4,487
Net Loans, Fair Value Disclosure	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	6,614	5,486	6,510
Deposits, Fair Value Disclosure	1,635,549	1,447,882	1,472,103
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	15,977	12,678	18,042
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	29,000	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0	0
Accrued Interest Payable, Fair Value Disclosure	472	584	676
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	486,888	478,698	425,416
Held-to-Maturity Securities, at Fair Value	278,390	248,252	254,936
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	255,537	285,012	302,446
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	20,823	31,312	31,513
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	1,246,005	1,192,628	1,164,743
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