Derivative Financial Instruments (Assets and liabilities) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	$ 10,518	$ 13,731
Liability Derivatives	9,693	12,588
Interest Rate Lock Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	789	1,236
Liability Derivatives	0	169
Forward Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	14	873
Liability Derivatives	70	26
Interest Rate Swap Agreements
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	9,583	11,569
Liability Derivatives	9,478	11,583
Foreign Exchange Contracts
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	132	53
Liability Derivatives	$ 145	$ 810

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

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=64837297&loc=SL5624163-113959

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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.

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