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Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |
Balance at beginning of period | $ 148,604 | $ 79,749
Acquisitions | 1,318 | 68,855
Balance at end of period | 149,922 | 148,604
Metropolitan Banks [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 13,767 | 13,767
Balance at end of period | 13,767 | 13,767
Community Banks [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 59,894 | 59,894
Acquisitions | 1,318 |
Balance at end of period | 61,212 | 59,894
Pegasus Bank [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 68,855 |
Acquisitions |  | 68,855
Balance at end of period | 68,855 | 68,855
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 | 624 | 624
Balance at end of period | $ 624 | $ 624

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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