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Derivative and Hedging Activities - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) instrument | Dec. 31, 2016 USD ($) instrument | Dec. 31, 2015 USD ($)
Derivative [Line Items] |  |  |
Gain (loss) on cash flow hedge ineffectiveness | $ 0 | $ 0 | $ 0
Amounts reclassified from AOCI to Income | 127,492 |  |
Derivatives Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | 352,000 |  |
Collateral against obligations | $ 250,000 |  |
Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Number of derivative liability instruments held | instrument | 2 |  |
Aggregate notional amount for derivative liability | $ 60,000,000 |  |
Interest Rate Products [Member] | Derivatives Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Number of derivative instruments held | instrument | 50 | 36 |
Derivative, notional amount | $ 734,300,000 | $ 582,200,000 |

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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, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: 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=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: 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=77997519&loc=d3e13433-108611 Reference 5: 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 6: 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 + Details
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