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Derivatives and Hedging Activities (Derivative Positions for Interest Rate Swaps which Qualify as Hedges) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |
Notional Amount |  | $ 75,000,000 | $ 75,000,000 |
Fair Value |  | 624,000 | (3,273,000) |
Amortization Of Deferred Hedge Gains Losses |  | 244,000 | 244,000 | $ 244,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax |  |  |  | $ 1,122,000
Positions Five [Member] |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |
Notional Amount | [1] | $ 25,000,000 |  |
Trade Date |  | Apr. 01, 2016 |  |
Effective Date |  | Jan. 17, 2017 |  |
Maturity Date |  | Dec. 15, 2021 |  |
Receive (Variable) Index |  | 3 Month LIBOR |  |
Current Rate Received |  | 0.00% |  |
Pay Fixed Swap Rate |  | 1.36% |  |
Fair Value |  | $ 689,000 |  |
Positions One [Member] |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |
Notional Amount |  |  | $ 25,000,000 |
Trade Date |  |  | Feb. 16, 2006 |
Effective Date |  |  | Dec. 28, 2006 |
Maturity Date |  |  | Dec. 28, 2016 |
Receive (Variable) Index |  |  | 3 Month LIBOR |
Current Rate Received |  |  | 0.51% |
Pay Fixed Swap Rate |  |  | 5.04% |
Fair Value |  |  | $ (1,054,000) |
Positions Six [Member] |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |
Notional Amount | [1] | $ 25,000,000 |  |
Trade Date |  | Apr. 01, 2016 |  |
Effective Date |  | Jan. 17, 2017 |  |
Maturity Date |  | Dec. 15, 2021 |  |
Receive (Variable) Index |  | 3 Month LIBOR |  |
Current Rate Received |  | 0.00% |  |
Pay Fixed Swap Rate |  | 1.36% |  |
Fair Value |  | $ 675,000 |  |
Positions Two [Member] |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |
Notional Amount |  |  | $ 25,000,000 |
Trade Date |  |  | Feb. 16, 2006 |
Effective Date |  |  | Dec. 28, 2006 |
Maturity Date |  |  | Dec. 28, 2016 |
Receive (Variable) Index |  |  | 3 Month LIBOR |
Current Rate Received |  |  | 0.51% |
Pay Fixed Swap Rate |  |  | 5.04% |
Fair Value |  |  | $ (1,055,000) |
Positions Four [Member] |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |
Notional Amount |  | $ 25,000,000 | $ 25,000,000 |
Trade Date |  | Dec. 09, 2008 | Dec. 09, 2008 |
Effective Date |  | Dec. 10, 2008 | Dec. 10, 2008 |
Maturity Date |  | Dec. 10, 2018 | Dec. 10, 2018 |
Receive (Variable) Index |  | 3 Month LIBOR | 3 Month LIBOR |
Current Rate Received |  | 0.95% | 0.49% |
Pay Fixed Swap Rate |  | 2.94% | 2.94% |
Fair Value |  | $ (740,000) | $ (1,164,000) |
[1] | (1) In April 2016, the Company entered into two forward starting swaps with notional amounts of $25.0 million each, with the intention of hedging $50.0 million of existing junior subordinated debentures, as the current hedges on this borrowing expired in December 2016.

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- Definition The amount of expense charged against earnings by an entity to record deferred gains and losses on hedge instruments. + References No definition available. + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges resulting from a termination. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 + Details
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