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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Allowance for loan losses
Loans and Leases Receivable, Net Amount	$ 2,511,706	$ 2,543,803
Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	11,868	13,693
Other
Allowance for loan losses
Loans and Leases Receivable, Net Amount	339	607
Commercial construction | Total commercial loans
Allowance for loan losses
Loans and Leases Receivable, Net Amount	152,700
Commercial construction | Total commercial loans | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount		259
Commercial real estate owner occupied | Total commercial real estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	253,792
Commercial real estate owner occupied | Total commercial real estate | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	1,184	3,441
Commercial real estate non-owner occupied | Total commercial real estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	733,353
Commercial real estate non-owner occupied | Total commercial real estate | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	770	383
Tax exempt
Allowance for loan losses
Loans and Leases Receivable, Net Amount	42,448
Commercial and industrial | Total commercial and industrial
Allowance for loan losses
Loans and Leases Receivable, Net Amount	336,989
Commercial and industrial | Total commercial and industrial | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	436	625
Commercial and industrial | Total commercial and industrial | Other
Allowance for loan losses
Loans and Leases Receivable, Net Amount	339	607
Residential mortgages | Total residential real estate | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	8,174	7,432
Home equity | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	1,298	1,493
Consumer other | Total consumer | Real Estate
Allowance for loan losses
Loans and Leases Receivable, Net Amount	$ 6	$ 60

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Amount after allowance and 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 and loans held for sale.

+ 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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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