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Derivative Activities (Interest rate swap not designated as hedging instruments and their term) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Notional derivative not designated as an hedging instrument. | $ 151,400 | $ 152,600
Derivatives Offered to Clients - 1 Month LIBOR [Member] | Rate 5.51% [Member] |  |
Derivative [Line Items] |  |
Notional derivative not designated as an hedging instrument. | $ 12,500 |
Fixed rate | 5.505% |
Settlement Date | Apr. 11, 2009 |
Maturity Date | Apr. 11, 2019 |
Mirror Image Derivatives - 1 Month LIBOR [Member] | Rate 5.51% [Member] |  |
Derivative [Line Items] |  |
Notional derivative not designated as an hedging instrument. | $ 12,500 |
Fixed rate | 5.505% |
Settlement Date | Apr. 11, 2009 |
Maturity Date | Apr. 11, 2019 |

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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 The settlement date of an investment contract. + 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 Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Details
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- Details
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