GOODWILL AND OTHER INTANGIBLE ASSETS (Net Carrying Amount of Goodwill By Segment) (Detail)	3 Months Ended
Mar. 31, 2020 USD ($)
Goodwill [Line Items]
Beginning balance	$ 347,149,000
Acquisition of Rembert Pendleton Jackson	22,559,000
Ending balance	369,708,000
Community Banking
Goodwill [Line Items]
Beginning balance	331,173,000
Acquisition of Rembert Pendleton Jackson	0
Ending balance	331,173,000
Insurance
Goodwill [Line Items]
Beginning balance	6,788,000
Acquisition of Rembert Pendleton Jackson	0
Ending balance	6,788,000
Investment Management
Goodwill [Line Items]
Beginning balance	9,188,000
Acquisition of Rembert Pendleton Jackson	22,559,000
Ending balance	$ 31,747,000

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.

Reference 1: 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=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
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-Paragraph 1
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