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Investment in Qualified Affordable Housing Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands | 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
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |  |
Amortization Method Qualified Affordable Housing Project Investments, Amortization | $ 1,900 | $ 1,900 | $ 5,553 | $ 5,592 |
Affordable housing tax credit investments | 52,116 |  | 52,116 |  | $ 49,669
Affordable Housing Program Obligation | 22,282 |  | 22,282 |  | $ 14,282
Affordable Housing Tax Credits and Other Tax Benefits, Amount | $ 2,000 | $ 2,300 | $ 6,900 | $ 6,900 |

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- Definition Amount of obligation related to Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932. + References No definition available. + Details
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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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- Definition Amount of investment in qualified affordable housing projects. + 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 (b) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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- Definition Amount of amortization expense of investment in qualified affordable housing projects. + 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 (c) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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