LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan Summary (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of loans
Proceeds of loans sold	$ 1,611,889	$ 1,237,402	$ 1,428,060
Mortgage fee income	41,045	32,337	$ 37,149
Total Loans	1,374,235	1,304,582
Deferred loan origination costs and (fees), net	306	(216)
Loans receivable	1,374,541	1,304,366
Commercial and Non-Residential Real Estate
Components of loans
Total Loans	1,063,828	941,033
Residential
Components of loans
Total Loans	271,604	294,929
Home Equity
Components of loans
Total Loans	35,106	59,015
Consumer
Components of loans
Total Loans	$ 3,697	$ 9,605

Represents the amount of mortgage fee income.

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

+ References

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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
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- Definition

The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 16
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3461-108585

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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