COMMITMENTS AND CONTINGENCIES (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) institution loan	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) institution loan transaction	Jun. 30, 2019 USD ($) transaction	Mar. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) loan
Guarantor Obligations [Line Items]
Provision for losses at the time of sale	$ 94,754,000	$ 12,195,000	$ 151,400,000	$ 19,849,000
Number of financial institutions | institution	4		4
Number of variable-rate to fixed-rate swap transactions | loan	213		213				172
Notional	$ 833,752,000		$ 833,752,000				$ 502,172,000
Derivative liability	91,700,000		91,700,000				26,400,000
Allowance for credit losses	232,192,000	45,364,000	232,192,000	45,364,000	$ 139,073,000		47,576,000
Provision for credit losses	94,754,000	12,195,000	151,400,000	19,849,000
Provision	1,189,000		4,640,000
Impact of ASC 326 Adoption
Guarantor Obligations [Line Items]
Allowance for credit losses							35,855,000
Unfunded Lending Commitment
Guarantor Obligations [Line Items]
Provision for losses at the time of sale	3,400,000		3,300,000
Allowance for credit losses	7,800,000		7,800,000				1,500,000
Provision for credit losses	$ 3,400,000		3,300,000
Provision		$ 300,000		$ 400,000
Unfunded Lending Commitment | Impact of ASC 326 Adoption
Guarantor Obligations [Line Items]
Allowance for credit losses						$ 3,000,000.0
Secondary Market Loan Sales
Guarantor Obligations [Line Items]
Provision for losses at the time of sale			$ 0
Number of loans repurchased | transaction			0	1
Loans repurchased				$ 200,000
Provision for credit losses			$ 0
Minimum
Guarantor Obligations [Line Items]
Remaining maturity period			1 year
Maximum
Guarantor Obligations [Line Items]
Remaining maturity period			15 years
Interest rate swap
Guarantor Obligations [Line Items]
Number of variable-rate to fixed-rate swap transactions | loan	211		211
Notional	$ 1,100,000,000		$ 1,100,000,000				$ 941,000,000.0
Derivative liability	$ 93,000,000.0		$ 93,000,000.0