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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Fair Value of Derivatives (Details) | Jun. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($)
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Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions |  |
Amount to be reclassified as a reduction to interest expense during the next twelve months | $ 59,000 |
Derivative assets designated as hedging instruments, classified in other assets | 507,000 |
Derivated liabilities designated as hedging instruments, classified in other liabilities |  | $ 1,287,000
Interest rate derivatives, derivative assets not designated as hedging instruments, classified in other assets | 507,000 |
Interest rate derivatives, derivative not designated as hedging instruments, classified in other liabilities | 507,000 | 1,287,000
Other derivatives, derivative not designated as hedging instruments, classified in other liabilities | 5,000 | 13,000
Derivative assets designated as hedging instruments, fair value | 507,000 |
Derivative liabilities designated as hedging instruments, fair value |  | 1,287,000
Derivative assets not designated as hedging instruments, fair value | 507,000 |
Total Derivative liabilities not designated as hedging instruments, fair value | $ 512,000 | $ 1,301,000
Interest Rate Products | Designated |  |
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions |  |
Derivative, number of transactions | item | 1 |
Notional Amount | $ 25,774,000 |
Interest Rate Products | Not designated |  |
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions |  |
Derivative, number of transactions | item | 2 |
Notional Amount | $ 51,548,000 |
Other Contracts | Not designated |  |
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions |  |
Derivative, number of transactions | item | 3 |
Notional Amount | $ 15,857,000 |

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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 all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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