INDEMNIFICATIONS AND GUARANTEES (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) loan transaction institution	Dec. 31, 2018 USD ($) loan
Guarantor Obligations [Line Items]
Number of unrelated financial institutions | institution	7
Derivative transaction held for guarantee | loan	156	136
Notional	$ 402,731,000
Aggregate fair value of swaps to customers, liability	(6,800,000)	$ (300,000)
Reserves for swap guarantees	$ 0
Minimum
Guarantor Obligations [Line Items]
Notional amount maturity period	1 year
Maximum
Guarantor Obligations [Line Items]
Notional amount maturity period	12 years
Secondary Market Loan Sales
Guarantor Obligations [Line Items]
Provision for losses at the time of sale	$ 0
Number of loans repurchased | transaction	1
Loans repurchased	$ 200,000
Interest Rate Swap
Guarantor Obligations [Line Items]
Derivative transaction held for guarantee | loan	93
Notional	$ 749,400,000	$ 581,500,000
Aggregate fair value of swaps to customers, liability	$ (10,900,000)