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Investments in Qualified Affordable Housing Projects (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 01, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying value of qualified affordable housing project investments |  | $ 7,637,000 | $ 6,331,000 |
Increase (decrease) in QAHP | $ (2,450,000) |  |  |
Commitment | $ 0 |  |  |
Investment amortization |  | 1,714,000 | 1,335,000 |
Tax credits and other benefits |  | (2,190,000) | (1,927,000) |
Total |  | $ (476,000) | $ (592,000) |
Metropolitan Bancgroup, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying value of qualified affordable housing project investments |  |  |  | $ 5,481,000

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- Definition Affordable Housing Tax Credits and Other Benefits, Net of Amortization + References No definition available. + Details
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- Definition Amortization Method Qualified Affordable Housing Project Investments, Increase (Decrease) + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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- Definition Amount of amortization expense of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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