GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2019		Sep. 30, 2018		Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Servicing Asset at Amortized Value, Balance [Roll Forward]
Servicing Asset at Amortized Cost, Additions, Acquisitions		$ 36		$ 47
Servicing Asset at Amortized Cost, Additions						$ 105	$ 92
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Morgage Servicing Rights at Amortized Value [Line Items]
Loans Serviced For Others		2,420,000				2,420,000		$ 2,360,000
Custodial Accounts		2,600				2,600		$ 11,100
Servicing Asset at Amortized Value, Balance [Roll Forward]
Balance, net of valuation allowance, beginning of the period		13,998		14,521		14,638	14,738
Additions—amounts capitalized		1,167		952		2,524	2,636
Amortization		(1,404)	[1]	(999)	[1]	(3,470)	(2,945)
Balance, net of valuation allowance, end of the period	[2]	13,797		$ 14,521		13,797	$ 14,521
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 September 30, 2019 and 2018.