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Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Goodwill [Line Items] |  |
Balance at beginning of period | $ 54,042 | $ 54,042
Balance at end of period | 54,042 | 54,042
Metropolitan Banks [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 8,078 | 8,078
Balance at end of period | 8,078 | 8,078
Community Banks [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 40,050 | 40,050
Balance at end of period | 40,050 | 40,050
Other Financial Services [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 5,464 | 5,464
Balance at end of period | 5,464 | 5,464
Executive, Operations & Support [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 450 | 450
Balance at end of period | $ 450 | $ 450

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Details
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