OFF BALANCE SHEET RISKS, COMMITMENTS AND CONTINGENT LIABILITIES (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Commitments and letters of credit
Loan commitment, line credit	$ 1,465,627,000	$ 1,571,130,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision	102,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	558,000
Unused warehouse lines of credit
Commitments and letters of credit
Loan commitment, line credit	318,546,000	436,541,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	55,000
Unused home equity lines of credit
Commitments and letters of credit
Loan commitment, line credit	361,425,000	363,195,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision	23,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	112,000
Unused loan commitments - other
Commitments and letters of credit
Loan commitment, line credit	772,367,000	757,657,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision	79,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	391,000
Standby letters of credit
Commitments and letters of credit
Loan commitment, line credit	10,804,000	11,252,000
FHLB letters of credit
Commitments and letters of credit
Loan commitment, line credit	2,485,000	$ 2,485,000
ASU 2016-13
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	456,000
ASU 2016-13 \| Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	456,000
ASU 2016-13 \| Adjustment \| Unused warehouse lines of credit
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	55,000
ASU 2016-13 \| Adjustment \| Unused home equity lines of credit
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	89,000
ASU 2016-13 \| Adjustment \| Unused loan commitments - other
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	$ 312,000

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118956080&loc=d3e11927-110247

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82919202-210446

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

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