GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Servicing Asset at Amortized Value, Balance [Roll Forward]
Additions—through purchase		$ 53		$ 40		$ 121	$ 141
Servicing Contracts [Member]
Morgage Servicing Rights at Amortized Value [Line Items]
Loans Serviced For Others		2,680,000				2,680,000		$ 2,640,000
Custodial Accounts		3,100				3,100		$ 3,800
Servicing Asset at Amortized Value, Balance [Roll Forward]
Balance, net of valuation allowance, beginning of the period		15,612		14,424		15,223	14,148
Additions—amounts capitalized		1,621		2,426		5,418	6,030
Amortization		(1,533)	[1]	(2,075)	[1]	(5,009)	(5,504)
Balance, net of valuation allowance, end of the period	[2]	15,753		$ 14,815		15,753	$ 14,815
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 September 30, 2021 and 2020.