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Qualified Affordable Housing	12 Months Ended
Qualified Affordable Housing	Dec. 31, 2017
Investments in Affordable Housing Projects [Abstract]
QUALIFIED AFFORDABLE HOUSING	QUALIFIED AFFORDABLE HOUSING We invest in affordable housing projects primarily to satisfy our Community Reinvestment Act requirements. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. We use the cost method to account for these partnerships. Our total investment in qualified affordable housing projects was $9.0 million at December 31, 2017 and $11.7 million at December 31, 2016. We have one open commitment for $0.8 million to fund a new qualified affordable housing project at December 31, 2017. There were no open commitments to fund current or future investments in qualified affordable housing projects at December 31, 2016. Amortization expense, included in other noninterest expense in the Consolidated Statements of Net Income, was $3.0 million, $3.3 million and $3.6 million for December 31, 2017, 2016 and 2015. The amortization expense was offset by tax credits of $3.4 million, $3.7 million and $4.0 million for December 31, 2017, 2016 and 2015, as a reduction to our federal tax provision. We evaluated our investments in affordable housing projects for impairment at December 31, 2017 due to the enactment of the Tax Act in 2017; the results indicated that the tax benefits associated with each investment exceeded the carrying values.