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Qualified Affordable Housing Projects (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Investments in Affordable Housing Projects [Abstract] |  |  |  |  |
Investment in qualified affordable housing projects | $ 6.7 |  | $ 6.7 |  | $ 8.7
Amortization expense included in noninterest expense | 0.7 | $ 0.8 | 2.0 | $ 2.3 |
Tax credits | $ 0.8 | $ 0.9 | $ 2.3 | $ 2.6 |

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- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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