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Accumulated Other Comprehensive Income (Reclassifications out of other comprehensive income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, net of tax	$ (8,047)			$ (10,963)
ASU 2017-12 [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, net of tax			$ 14,400
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest Rate Contract	217	$ 374
Residual tax effect from OIB's change in applicable tax rate AFS	0	5
Tax effect from increase in capital gains tax rate AFS	(17)	(65)
Total	$ 200	$ 314

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Derivative instrument whose primary underlying risk is tied to the right to receive or pay a sum of money at a given interest rate.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
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