SEGMENT REPORTING - Narrative (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment	3
Amortization of intangible assets	$ 1,508	$ 1,697
Community Banking
Segment Reporting Information [Line Items]
Amortization of intangible assets	1,100	1,200
Insurance
Segment Reporting Information [Line Items]
Amortization of intangible assets	0	0
Investment Management
Segment Reporting Information [Line Items]
Amortization of intangible assets	400	$ 500
Investment Management \| West Financial and RPJ
Segment Reporting Information [Line Items]
Assets under management	$ 3,900,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration