Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 60,741		$ 66,077	$ 57,355
Available-for-Sale	325,387	$ 300,200	327,392
Securities Available-for-Sale		300,200	327,392
Held-to-Maturity at Amortized Cost	297,885	335,907	348,018
Held-To-Maturity Securities, at Fair Value	292,605	335,901	350,355
Equity Securities	1,802	0	0
Net Loans	2,038,222	1,932,184	1,861,190
Deposits	2,304,781	2,245,116	2,220,038
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase		64,966	40,892
Federal Home Loan Bank Overnight Advances		105,000	122,000
Federal Home Loan Bank Term Advances		55,000	55,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts		20,000	20,000
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	60,741	72,838	66,077
Available-for-Sale	325,387
Securities Available-for-Sale		300,200	327,392
Held-to-Maturity at Amortized Cost	297,885	335,907	348,018
Equity Securities	1,802
Federal Home Loan Bank and Federal Reserve Bank Stock	11,089	9,949	11,035
Net Loans	2,038,222	1,932,184	1,861,190
Accrued Interest Receivable	6,729	6,753	6,563
Deposits	2,304,781	2,245,116	2,220,038
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	60,248	64,966	40,892
Federal Home Loan Bank Overnight Advances	136,000	105,000	122,000
Federal Home Loan Bank Term Advances	45,000	55,000	55,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	540	410	252
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	60,741	72,838	66,077
Available-for-Sale	325,387
Securities Available-for-Sale		300,200	327,392
Held-To-Maturity Securities, at Fair Value	292,605	335,901	350,355
Equity Securities	1,802
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	11,089	9,949	11,035
Net Loans, at Fair Value	1,971,756	1,901,046	1,844,301
Accrued Interest Receivable, Fair Value Disclosure	6,729	6,753	6,563
Deposits, at Fair Value	2,295,796	2,236,548	2,212,256
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, at Fair Value	60,248	64,966	40,892
Federal Home Loan Bank Overnight Advances, Fair Value Disclosure	136,000	105,000	122,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure	44,495	54,781	55,448
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	540	410	252
Quoted Prices In Active Markets for Indentical Assets (Level 1) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	60,741	72,838	66,077
Available-for-Sale	59,615
Securities Available-for-Sale		59,894	54,676
Held-To-Maturity Securities, at Fair Value	0	0	0
Equity Securities	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	0	0	0
Net Loans, at Fair Value	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	0	0	0
Deposits, at Fair Value	0	0	0
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, at Fair Value	0	0	0
Federal Home Loan Bank Overnight Advances, 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
Significant Other Observable Inputs (Level 2) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0	0
Available-for-Sale	265,772
Securities Available-for-Sale		240,306	272,716
Held-To-Maturity Securities, at Fair Value	292,605	335,901	350,355
Equity Securities	1,802
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	11,089	9,949	11,035
Net Loans, at Fair Value	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	6,729	6,753	6,563
Deposits, at Fair Value	2,295,796	2,236,548	2,212,256
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, at Fair Value	60,248	64,966	40,892
Federal Home Loan Bank Overnight Advances, Fair Value Disclosure	136,000	105,000	122,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure	44,495	54,781	55,448
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	540	410	252
Significant Unobservable Inputs (Level 3) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0	0
Available-for-Sale	0
Securities Available-for-Sale		0	0
Held-To-Maturity Securities, at Fair Value	0	0	0
Equity Securities	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	0	0	0
Net Loans, at Fair Value	1,971,756	1,901,046	1,844,301
Accrued Interest Receivable, Fair Value Disclosure	0	0	0
Deposits, at Fair Value	0	0	0
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, at Fair Value	0	0	0
Federal Home Loan Bank Overnight Advances, 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