Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 57,751	$ 43,736	$ 57,320	$ 31,079
Available-for-sale	431,010	556,538	511,094
Available-for-sale Securities, at Fair Value	431,010	556,538	511,094
Held-to-maturity	252,902	150,688	138,334
Federal Home Loan Bank and Federal Reserve Bank Stock	4,479	6,722	7,019
Net Loans	1,131,430	1,116,454	1,105,276
Accrued Interest Receivable	5,712	6,082	6,689
Deposits	1,704,883	1,644,046	1,541,859
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	16,097	26,293	60,361
Federal Home Loan Bank Term Advances	30,000	40,000	90,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	898	1,147	1,549
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	57,751	43,736	57,320
Available-for-sale	431,010	556,538	511,094
Held-to-maturity	252,902	150,688	138,334
Federal Home Loan Bank and Federal Reserve Bank Stock	4,479	6,722	7,019
Net Loans	1,131,430	1,116,454	1,105,276
Accrued Interest Receivable	5,712	6,082	6,689
Deposits	1,704,883	1,644,046	1,541,859
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	16,097	26,293	60,361
Federal Home Loan Bank Term Advances	30,000		90,000
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	898	1,147	1,549
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	57,751	43,736	57,320
Available-for-sale Securities, at Fair Value	431,010	556,538	511,094
Securities Held-to-maturity, Fair Value Disclosure	261,574	159,059	143,327
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	4,479	6,722	7,019
Net Loans, Fair Value Disclosure	1,156,811	1,141,310	1,132,069
Accrued Interest Receivable, Fair Value Disclosure	5,712	6,082	6,689
Deposits, Fair Value Disclosure	1,708,994	1,650,849	1,550,490
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	16,097	26,293	60,361
Federal Home Loan Bank Term Advances, Fair Value Disclosure	31,269	83,553	93,236
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	898	1,147	1,549
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	57,751	43,736	57,320
Available-for-sale Securities, at Fair Value	249	257	215
Securities Held-to-maturity, Fair Value Disclosure	0	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	4,479	6,722	7,019
Net Loans, Fair Value Disclosure	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	5,712	6,082	6,689
Deposits, Fair Value Disclosure	1,380,904	1,291,388	1,178,912
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	16,097	26,293	60,361
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	898	1,147	1,549
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	430,761	556,281	510,562
Securities Held-to-maturity, Fair Value Disclosure	261,574	159,059	143,327
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	328,090	359,461	371,578
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	31,269	83,553	93,236
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	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	1,156,811	1,141,310	1,132,069
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