SUMMARY OF ORGANIZATION - Additional information (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended				6 Months Ended
	Jul. 15, 2021	May 21, 2021	Feb. 25, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Organization [Line Items]
Total assets				$ 5,509,733				$ 5,509,733		$ 5,152,760
Loans, excluding Loans held for sale								3,004,000
Deposits				4,673,912				4,673,912		4,215,280
Stockholders' equity				660,052	$ 643,949	$ 627,795	$ 555,926	660,052	$ 627,795	$ 644,815	$ 543,658
Net income				$ 15,600	$ 16,644	$ 16,943	$ 8,311	$ 32,244	$ 25,254
Dividends on common stock, per share		$ 0.14	$ 0.13
Subsequent Event
Organization [Line Items]
Dividends on common stock, per share	$ 0.15