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
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-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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OFF BALANCE SHEET RISKS, COMMITMENTS AND CONTINGENT LIABILITIES (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Commitments and letters of credit
Loan commitment, line credit	$ 1,351,035,000	$ 1,351,035,000	$ 1,571,130,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	558,000
Provision	78,000	180,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	636,000	636,000
Unused warehouse lines of credit
Commitments and letters of credit
Loan commitment, line credit	174,220,000	174,220,000	436,541,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	55,000
Provision	3,000	3,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	58,000	58,000
Unused home equity lines of credit
Commitments and letters of credit
Loan commitment, line credit	362,177,000	362,177,000	363,195,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	112,000
Provision	12,000	35,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	124,000	124,000
Unused loan commitments - other
Commitments and letters of credit
Loan commitment, line credit	803,204,000	803,204,000	757,657,000
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Beginning Balance	391,000
Provision	63,000	142,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	454,000	454,000
Standby letters of credit
Commitments and letters of credit
Loan commitment, line credit	10,791,000	10,791,000	11,252,000
FHLB letters of credit
Commitments and letters of credit
Loan commitment, line credit	$ 643,000	643,000	$ 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