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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Fair Value of Derivatives (Details) $ in Thousands	Mar. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
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	$ 117,308
Derivated liabilities designated as hedging instruments, classified in other liabilities	7	$ 1,287
Interest rate derivatives, derivative assets not designated as hedging instruments, classified in other assets	7
Interest rate derivatives, derivative not designated as hedging instruments, classified in other liabilities	7	1,287
Other derivatives, derivative not designated as hedging instruments, classified in other liabilities	7	13
Derivative liabilities designated as hedging instruments, fair value	7	1,287
Derivative assets not designated as hedging instruments, fair value	7
Total Derivative liabilities not designated as hedging instruments, fair value	$ 14	$ 1,301
Interest Rate Products | Designated
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item	1
Notional Amount	$ 25,774
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
Other Contracts | Not designated
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item	3
Notional Amount	$ 15,908

X

- 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

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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

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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

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The number of derivative instruments of a particular group held by the entity.

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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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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.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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