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LOANS AND ALLOWANCE FOR LOAN LOSSES (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 3,274,842	$ 3,095,023	$ 3,110,634
Pass (Grades 1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,903,363	2,696,045
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	295,119	336,401
Special Mention (Grade 7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	27,066	34,859
Substandard (Grade 8)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	46,793	25,568
Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,501	2,150
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,044,103	1,070,374	1,061,898
Residential Real Estate | Pass (Grades 1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,037,649	1,062,825
Residential Real Estate | Special Mention (Grade 7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	405	473
Residential Real Estate | Substandard (Grade 8)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	6,049	7,076
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,333,733	1,243,397	1,255,519
Commercial Real Estate | Pass (Grades 1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,273,616	1,196,683
Commercial Real Estate | Special Mention (Grade 7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	23,899	31,753
Commercial Real Estate | Substandard (Grade 8)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	36,218	14,961
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	360,629	421,108	421,754
Commercial | Pass (Grades 1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	354,160	415,870
Commercial | Special Mention (Grade 7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,762	2,544
Commercial | Substandard (Grade 8)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,707	2,694
SBA PPP Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	223,838	0	0
SBA PPP Portfolio Segment | Pass (Grades 1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	223,838
Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	274,743	312,779	323,564
Home Equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	272,246	310,653
Home Equity | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,497	2,126
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	22,877	25,772	24,187
Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	22,873	25,748
Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4	24
HPFC Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	14,919	21,593	$ 23,712
HPFC Portfolio Segment | Pass (Grades 1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	14,100	20,667
HPFC Portfolio Segment | Special Mention (Grade 7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		89
HPFC Portfolio Segment | Substandard (Grade 8)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 819	$ 837

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+ References

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

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