Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 64,803	$ 57,355	$ 60,711	$ 51,068
Available-for-Sale	347,159	346,996	388,247
Held-to-Maturity at Amortized Cost	335,211	345,427	315,284
Held-To-Maturity Securities, at Fair Value	335,105	343,751	324,337
Federal Home Loan Bank and Federal Reserve Bank Stock	6,826	10,912	5,149
Net Loans	1,793,589	1,736,256	1,606,441
Deposits	2,256,536	2,116,546	2,115,061
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	32,035	35,836	45,155
Federal Home Loan Bank Overnight Advances	32,000	123,000	0
Federal Home Loan Bank Term Advances	55,000	55,000	55,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	64,803		60,711
Net Loans	1,793,589	1,736,256	1,606,441
Accrued Interest Receivable	7,530	6,684	7,156
Deposits	2,256,536	2,116,546	2,115,061
Accrued Interest Payable	240	247	227
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	64,803	57,355	60,711
Available-for-Sale	347,159	346,996	388,247
Held-To-Maturity Securities, at Fair Value	335,105	343,751	324,337
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	6,826	10,912	5,149
Net Loans, Fair Value Disclosure	1,773,895	1,720,078	1,613,221
Accrued Interest Receivable, Fair Value Disclosure	7,530	6,684	7,156
Deposits, Fair Value Disclosure	2,248,066	2,109,557	2,109,546
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	32,035	35,836	45,155
Federal Funds Purchased, Fair Value Disclosure	32,000	123,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure	55,130	55,118	56,630
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	240	247	227
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	64,803	57,355	60,711
Available-for-Sale		54,706	0
Held-To-Maturity Securities, at Fair Value	0	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	6,826	10,912	5,149
Net Loans, Fair Value Disclosure	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	7,530	6,684	7,156
Deposits, Fair Value Disclosure	2,058,301	1,917,233	1,925,905
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	32,035	35,836	45,155
Federal Funds Purchased, Fair Value Disclosure	32,000	123,000
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	240	247	227
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	292,464	292,290	388,247
Held-To-Maturity Securities, at Fair Value	335,105	343,751	324,337
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	189,765	192,324	183,641
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	0	0	0
Federal Funds Purchased, Fair Value Disclosure	0	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	55,130	55,118	56,630
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) | 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	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	1,773,895	1,720,078	1,613,221
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 Funds Purchased, Fair Value Disclosure	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