GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2021		Jun. 30, 2020		Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Servicing Asset at Amortized Value, Balance [Roll Forward]
Additions—through purchase		$ 41		$ 38		$ 68	$ 101
Servicing Contracts [Member]
Morgage Servicing Rights at Amortized Value [Line Items]
Loans Serviced For Others		2,660,000				2,660,000		$ 2,640,000
Custodial Accounts		3,700				3,700		$ 3,800
Servicing Asset at Amortized Value, Balance [Roll Forward]
Balance, net of valuation allowance, beginning of the period		15,407		14,277		15,223	14,148
Additions—amounts capitalized		1,787		2,184		3,797	3,604
Amortization		(1,623)	[1]	(2,075)	[1]	(3,476)	(3,429)
Balance, net of valuation allowance, end of the period	[2]	15,612		$ 14,424		15,612	$ 14,424
Valuation allowance, end of period		$ 0				$ 0

[1] Amortization of mortgage servicing rights is recorded as a reduction of loan servicing income within mortgage banking operations and any unamortized balance is fully amortized if the loan repays in full.

[2] There was no valuation allowance as of both June 30, 2021 and 2020.