Fair Values Fair Value By Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 72,838	$ 57,355	$ 51,068	$ 46,295
Available-for-Sale	300,200	346,996
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016)	335,907	345,427
Held-To-Maturity Securities, at Fair Value	335,901	343,751
Other Investments	9,949	10,912
Net Loans	1,932,184	1,736,256
Deposits	2,245,116	2,116,546
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	64,966	35,836
Federal Home Loan Bank Overnight Advances	105,000	123,000
Federal Home Loan Bank Term Advances	55,000	55,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	72,838	57,355
Available-for-Sale	300,200	346,996
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016)	335,907	345,427
Other Investments	9,949	10,912
Net Loans	1,932,184	1,736,256
Accrued Interest Receivable	6,753	6,684
Deposits	2,245,116	2,116,546
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase		35,836
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	64,966
Federal Home Loan Bank Overnight Advances	105,000	123,000
Federal Home Loan Bank Term Advances	55,000	55,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000
Accrued Interest Payable	410	247
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	72,838	57,355
Available-for-Sale	300,200	346,996
Held-To-Maturity Securities, at Fair Value	335,901	343,751
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Fair Value Disclosure	9,949	10,912
Net Loans, Fair Value Disclosure	1,901,046	1,720,078
Accrued Interest Receivable, Fair Value Disclosure	6,753	6,684
Deposits, Fair Value Disclosure	2,236,548	2,109,557
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	64,966	35,836
Federal Home Loan Bank Overnight Advances	105,000	123,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure	54,781	55,118
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	410	247
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	72,838	57,355
Available-for-Sale	59,894	54,706
Held-To-Maturity Securities, at Fair Value	0	0
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Fair Value Disclosure	0	0
Net Loans, Fair Value Disclosure	0	0
Accrued Interest Receivable, Fair Value Disclosure	0	0
Deposits, Fair Value Disclosure	0	0
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	0	0
Federal Home Loan Bank Overnight Advances	0	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0
Accrued Interest Payable, Fair Value Disclosure	0	0
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
Available-for-Sale	240,306	292,290
Held-To-Maturity Securities, at Fair Value	335,901	343,751
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Fair Value Disclosure	9,949	10,912
Net Loans, Fair Value Disclosure	0	0
Accrued Interest Receivable, Fair Value Disclosure	6,753	6,684
Deposits, Fair Value Disclosure	2,236,548	2,109,557
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	64,966	35,836
Federal Home Loan Bank Overnight Advances	105,000	123,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure	54,781	55,118
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	410	247
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
Available-for-Sale	0	0
Held-To-Maturity Securities, at Fair Value	0	0
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Fair Value Disclosure	0	0
Net Loans, Fair Value Disclosure	1,901,046	1,720,078
Accrued Interest Receivable, Fair Value Disclosure	0	0
Deposits, Fair Value Disclosure	0	0
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	0	0
Federal Home Loan Bank Overnight Advances	0	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0
Accrued Interest Payable, Fair Value Disclosure	$ 0	$ 0