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Intangible Assets - Summary of Goodwill by Business Segment (Detail) $ in Thousands | Mar. 31, 2016 USD ($)
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Goodwill [Line Items] |
Balance at December 31, 2015 | $ 54,042
Balance at March 31, 2016 | 54,042
Metropolitan Banks [Member] |
Goodwill [Line Items] |
Balance at December 31, 2015 | 8,078
Balance at March 31, 2016 | 8,078
Community Banks [Member] |
Goodwill [Line Items] |
Balance at December 31, 2015 | 40,050
Balance at March 31, 2016 | 40,050
Other Financial Services [Member] |
Goodwill [Line Items] |
Balance at December 31, 2015 | 5,464
Balance at March 31, 2016 | 5,464
Executive, Operations & Support [Member] |
Goodwill [Line Items] |
Balance at December 31, 2015 | 450
Balance at March 31, 2016 | $ 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 -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 + Details
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