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Derivatives and Hedging Activities (Derivative Positions for Interest Rate Swaps which Qualify as Hedges) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Fair Value | $ 1,878,000 |  | $ 1,878,000 |  | $ 1,616,000
Amortization Of Deferred Hedge Gains Losses | 61,000 | $ 61,000 | 122,000 | $ 122,000 |
Change in Fair Value on Loans Held for Sale | 70,000 | $ 153,000 | 44,000 | $ 6,000 |
Notional amount of fair value hedged derivative | 0 |  | $ 0 |  | 0
Positions One [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount |  |  |  |  | $ 25,000,000
Receive (Variable) Index |  |  |  |  | 3 Month LIBOR
Derivative, Variable Interest Rate |  |  |  |  | 1.54%
Trade Date |  |  | Dec. 09, 2008 |  |
Derivative, Inception Date |  |  | Dec. 10, 2008 |  |
Maturity Date |  |  | Dec. 10, 2018 |  |
Pay Fixed Swap Rate |  |  |  |  | 2.94%
Fair Value |  |  |  |  | $ (264,000)
Positions Two [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount |  |  |  |  | $ 25,000,000
Receive (Variable) Index |  |  |  |  | 3 Month LIBOR
Derivative, Variable Interest Rate |  |  |  |  | 1.59%
Trade Date |  |  | Apr. 01, 2016 |  |
Derivative, Inception Date |  |  | Jan. 17, 2017 |  |
Maturity Date |  |  | Dec. 15, 2021 |  |
Pay Fixed Swap Rate |  |  |  |  | 1.36%
Fair Value |  |  |  |  | $ 772,000
Positions Three [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount |  |  |  |  | $ 25,000,000
Receive (Variable) Index |  |  |  |  | 3 Month LIBOR
Derivative, Variable Interest Rate |  |  |  |  | 1.59%
Trade Date |  |  | Apr. 01, 2016 |  |
Derivative, Inception Date |  |  | Jan. 17, 2017 |  |
Maturity Date |  |  | Dec. 15, 2021 |  |
Pay Fixed Swap Rate |  |  |  |  | 1.36%
Fair Value |  |  |  |  | $ 763,000
Positions Four [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount |  |  |  |  | $ 25,000,000
Receive (Variable) Index |  |  |  |  | 3 Month LIBOR
Derivative, Variable Interest Rate |  |  |  |  | 1.42%
Trade Date |  |  | Jul. 18, 2017 |  |
Derivative, Inception Date |  |  | Aug. 15, 2017 |  |
Maturity Date |  |  | Aug. 15, 2022 |  |
Pay Fixed Swap Rate |  |  |  |  | 1.88%
Fair Value |  |  |  |  | $ 345,000
Positions Five [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount | $ 25,000,000 |  | $ 25,000,000 |  |
Receive (Variable) Index |  |  | 3 Month LIBOR |  |
Derivative, Variable Interest Rate | 2.33% |  | 2.33% |  |
Trade Date |  |  | Dec. 09, 2008 |  |
Derivative, Inception Date |  |  | Dec. 10, 2008 |  |
Maturity Date |  |  | Dec. 10, 2018 |  |
Pay Fixed Swap Rate | 2.94% |  | 2.94% |  |
Fair Value | $ (61,000) |  | $ (61,000) |  |
Positions Six [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount | $ 25,000,000 |  | $ 25,000,000 |  |
Receive (Variable) Index |  |  | 3 Month LIBOR |  |
Derivative, Variable Interest Rate | 2.34% |  | 2.34% |  |
Trade Date |  |  | Apr. 01, 2016 |  |
Derivative, Inception Date |  |  | Jan. 17, 2017 |  |
Maturity Date |  |  | Dec. 15, 2021 |  |
Pay Fixed Swap Rate | 1.36% |  | 1.36% |  |
Fair Value | $ 1,227,000 |  | $ 1,227,000 |  |
Positions Seven [Member] [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount | $ 25,000,000 |  | $ 25,000,000 |  |
Receive (Variable) Index |  |  | 3 Month LIBOR |  |
Derivative, Variable Interest Rate | 2.34% |  | 2.34% |  |
Trade Date |  |  | Apr. 01, 2016 |  |
Derivative, Inception Date |  |  | Jan. 17, 2017 |  |
Maturity Date |  |  | Dec. 15, 2021 |  |
Pay Fixed Swap Rate | 1.36% |  | 1.36% |  |
Fair Value | $ 1,218,000 |  | $ 1,218,000 |  |
Position Eight [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount | $ 25,000,000 |  | $ 25,000,000 |  |
Receive (Variable) Index |  |  | 3 Month LIBOR |  |
Derivative, Variable Interest Rate | 2.32% |  | 2.32% |  |
Trade Date |  |  | Jul. 18, 2017 |  |
Derivative, Inception Date |  |  | Aug. 15, 2017 |  |
Maturity Date |  |  | Aug. 15, 2022 |  |
Pay Fixed Swap Rate | 1.88% |  | 1.88% |  |
Fair Value | $ 949,000 |  | $ 949,000 |  |
Position Nine [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount | $ 50,000,000 |  | $ 50,000,000 |  |
Receive (Variable) Index |  |  | 1 Month LIBOR |  |
Current Rate Paid on Derivative for Interest Rate Swaps which qualify as hedges | 2.07% |  | 2.07% |  |
Trade Date |  |  | Jan. 09, 2018 |  |
Derivative, Inception Date |  |  | Jan. 16, 2018 |  |
Maturity Date |  |  | Jan. 15, 2023 |  |
Pay Fixed Swap Rate | 2.24% |  | 2.24% |  |
Fair Value | $ (1,073,000) |  | $ (1,073,000) |  |
Position ten [Member] |  |  |  |  |
Details of derivative positions for interest rate swaps which qualify as hedges for accounting purposes |  |  |  |  |
Notional Amount | $ 50,000,000 |  | $ 50,000,000 |  |
Receive (Variable) Index |  |  | 1 Month LIBOR |  |
Current Rate Paid on Derivative for Interest Rate Swaps which qualify as hedges | 2.07% |  | 2.07% |  |
Trade Date |  |  | Jan. 09, 2018 |  |
Derivative, Inception Date |  |  | Jan. 16, 2018 |  |
Maturity Date |  |  | Jan. 15, 2022 |  |
Fair Value | $ (382,000) |  | $ (382,000) |  |
Derivative, Cap Price | 2.75% |  | 2.75% |  |
Derivative, Floor Price | 1.80% |  | 1.80% |  |

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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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