INDEMNIFICATIONS AND GUARANTEES (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) loan Transaction Financial_Institution	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) loan
Guarantor Obligations [Line Items]
Provision for losses at the time of sale	$ 3,650,000	$ 2,162,000
Number of unrelated financial institutions | Financial_Institution	4
Derivative transaction held for guarantee | loan	129		134
Notional	$ 216,387,000
Aggregate fair value of swaps to customers	4,700,000		$ 3,300,000
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	10 years
Secondary Market Loan Sales
Guarantor Obligations [Line Items]
Provision for losses at the time of sale	$ 0
Number of loans repurchased | Transaction	0
Interest Rate Swap [Member]
Guarantor Obligations [Line Items]
Notional	$ 558,300,000		$ 561,800,000