GOODWILL AND OTHER INTANGIBLE ASSETS (Net Carrying Amount of Goodwill By Segment) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Beginning balance	$ 85,768	$ 85,768
WashingtonFirst Acquisition	261,381	0
Ending balance	347,149	85,768
Community Banking
Goodwill [Line Items]
Beginning balance	69,991	69,991
WashingtonFirst Acquisition	261,182	0
Ending balance	331,173	69,991
Insurance
Goodwill [Line Items]
Beginning balance	6,788	6,788
WashingtonFirst Acquisition	0	0
Ending balance	6,788	6,788
Investment Management
Goodwill [Line Items]
Beginning balance	8,989	8,989
WashingtonFirst Acquisition	199	0
Ending balance	$ 9,188	$ 8,989

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
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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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.

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-SubTopic 20
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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+ References

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