Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 80,666	$ 57,355	$ 102,059	$ 51,068
Available-for-Sale	315,459	346,996	339,190
Held-to-Maturity at Amortized Cost	341,526	345,427	338,238
Held-To-Maturity Securities, at Fair Value	343,899	343,751	347,441
Federal Home Loan Bank and Federal Reserve Bank Stock	6,704	10,912	5,371
Net Loans	1,891,104	1,736,256	1,690,241
Deposits	2,307,116	2,116,546	2,213,187
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	61,419	35,836	38,589
Federal Home Loan Bank Overnight Advances	33,000	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	80,666		102,059
Net Loans	1,891,104	1,736,256	1,690,241
Accrued Interest Receivable	7,692	6,684	7,046
Deposits	2,307,116	2,116,546	2,213,187
Accrued Interest Payable	260	247	247
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	80,666	57,355	102,059
Available-for-Sale	315,459	346,996	339,190
Held-To-Maturity Securities, at Fair Value	343,899	343,751	347,441
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	6,704	10,912	5,371
Net Loans, Fair Value Disclosure	1,870,379	1,720,078	1,696,929
Accrued Interest Receivable, Fair Value Disclosure	7,692	6,684	7,046
Deposits, Fair Value Disclosure	2,299,011	2,109,557	2,207,985
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	61,419	35,836	38,589
Federal Funds Purchased, Fair Value Disclosure	33,000	123,000	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	55,110	55,118	55,955
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	260	247	247
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	80,666	57,355	102,059
Available-for-Sale	64,730	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	0	0	0
Net Loans, Fair Value Disclosure	0	0	0
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
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	250,729	292,290	339,190
Held-To-Maturity Securities, at Fair Value	343,899	343,751	347,441
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure	6,704	10,912	5,371
Net Loans, Fair Value Disclosure	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	7,692	6,684	7,046
Deposits, Fair Value Disclosure	2,299,011	2,109,557	2,207,985
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Fair Value Disclosure	61,419	35,836	38,589
Federal Funds Purchased, Fair Value Disclosure	33,000	123,000	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	55,110	55,118	55,955
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	260	247	247
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	1,870,379	1,720,078	1,696,929
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