Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 66,077	$ 57,355	$ 63,115	$ 51,068
Available-for-Sale	327,392	346,996	362,929
Held-to-Maturity at Amortized Cost	348,018	345,427	343,814
Held-To-Maturity Securities, at Fair Value	350,355	343,751	354,778
Federal Home Loan Bank and Federal Reserve Bank Stock	11,035	10,912	9,961
Net Loans	1,861,190	1,736,256	1,655,692
Deposits	2,220,038	2,116,546	2,072,385
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	40,892	35,836	41,497
Federal Home Loan Bank Overnight Advances	122,000	123,000	102,000
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	66,077		63,115
Net Loans	1,861,190	1,736,256	1,655,692
Accrued Interest Receivable	6,563	6,684	6,383
Deposits	2,220,038	2,116,546	2,072,385
Accrued Interest Payable	252	247	231
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	66,077	57,355	63,115
Available-for-Sale	327,392	346,996	362,929
Held-To-Maturity Securities, at Fair Value	350,355	343,751	354,778
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	11,035	10,912	9,961
Net Loans, Fair Value Disclosure	1,844,301	1,720,078	1,664,713
Accrued Interest Receivable, Fair Value Disclosure	6,563	6,684	6,383
Deposits, Fair Value Disclosure	2,212,256	2,109,557	2,067,328
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	40,892	35,836	41,497
Federal Funds Purchased, Fair Value Disclosure	122,000	123,000	102,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure	55,448	55,118	56,145
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	252	247	231
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	66,077	57,355	63,115
Available-for-Sale	54,676	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	11,035	10,912	9,961
Net Loans, Fair Value Disclosure	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	6,563	6,684	6,383
Deposits, Fair Value Disclosure	2,018,424	1,917,233	1,869,865
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	40,892	35,836	41,497
Federal Funds Purchased, Fair Value Disclosure	122,000	123,000	102,000
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	252	247	231
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	272,716	292,290	362,929
Held-To-Maturity Securities, at Fair Value	350,355	343,751	354,778
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	193,832	192,324	197,463
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	0	0	0
Federal Funds Purchased, Fair Value Disclosure	0	0	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	55,448	55,118	56,145
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	1,844,301	1,720,078	1,664,713
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	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