FAIR VALUE OF ASSETS AND LIABILITIES - Level 3 (Details) - Derivative and Forward Loan Sale Commitments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Changes in Level 3 assets
Balance at beginning of year	$ 8,078	$ 1,732	$ 1,411	$ 1,261
Total gains included in net income	2,766	762	9,433	1,233
Balance at end of period	10,844	2,494	10,844	2,494
Changes in unrealized gains relating to instruments at period end	10,844	2,494	10,844	2,494
Changes in Level 3 liabilities
Balance at beginning of year	(5,480)	(539)	(332)	(630)
Total gains (losses) included in net income	3,413	(643)	(1,735)	(552)
Balance at end of period	(2,067)	(1,182)	(2,067)	(1,182)
Changes in unrealized losses relating to instruments at period end	$ (2,067)	$ (1,182)	$ (2,067)	$ (1,182)