Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 136,418	$ 43,736	$ 137,790	$ 31,079
Available-for-sale	425,416	556,538	472,340
Available-for-sale Securities, at Fair Value	425,416	556,538	472,340
Held-to-maturity	244,949	150,688	146,416
Federal Home Loan Bank and Federal Reserve Bank Stock	4,487	6,722	4,760
Net Loans	1,137,704	1,116,454	1,105,771
Accrued Interest Receivable	6,510	6,082	6,508
Deposits	1,771,461	1,644,046	1,649,339
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	18,042	26,293	47,644
Federal Home Loan Bank Term Advances	30,000	40,000	40,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	676	1,147	1,210
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	136,418	43,736	137,790
Available-for-sale	425,416	556,538	472,340
Held-to-maturity	244,949	150,688	146,416
Federal Home Loan Bank and Federal Reserve Bank Stock	4,487	6,722	4,760
Net Loans	1,137,704	1,116,454	1,105,771
Accrued Interest Receivable	6,510	6,082	6,508
Deposits	1,771,461	1,644,046	1,649,339
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	18,042	26,293	47,644
Federal Home Loan Bank Term Advances	30,000		40,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure		82,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	676	1,147	1,210
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	136,418	43,736	137,790
Available-for-sale Securities, at Fair Value	425,416	556,538	472,340
Securities Held-to-maturity, Fair Value Disclosure	254,936	159,059	153,131
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	4,487	6,722	4,760
Net Loans, Fair Value Disclosure	1,164,743	1,141,310	1,130,115
Accrued Interest Receivable, Fair Value Disclosure	6,510	6,082	6,508
Deposits, Fair Value Disclosure	1,774,549	1,650,849	1,657,374
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	18,042	26,293	47,644
Federal Home Loan Bank Term Advances, Fair Value Disclosure	31,513	83,553	41,564
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	676	1,147	1,210
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	136,418	43,736	137,790
Available-for-sale Securities, at Fair Value	0	257	207
Securities Held-to-maturity, Fair Value Disclosure	0	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	4,487	6,722	4,760
Net Loans, Fair Value Disclosure	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	6,510	6,082	6,508
Deposits, Fair Value Disclosure	1,472,103	1,291,388	1,285,371
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	18,042	26,293	47,644
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	676	1,147	1,210
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 Securities, at Fair Value	425,416	556,281	471,816
Securities Held-to-maturity, Fair Value Disclosure	254,936	159,059	153,131
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	302,446	359,461	372,003
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	31,513	83,553	41,564
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0	0
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 Securities, at Fair Value	0	0	317
Securities Held-to-maturity, Fair Value Disclosure	0	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	0	0	0
Net Loans, Fair Value Disclosure	1,164,743	1,141,310	1,130,115
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