GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Servicing Asset at Amortized Value, Balance [Roll Forward]
Servicing Asset at Amortized Cost, Additions, Acquisitions		$ 22		$ 30
Servicing Asset at Amortized Cost, Additions						$ 69	$ 45
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Morgage Servicing Rights at Amortized Value [Line Items]
Loans Serviced For Others		2,390,000				2,390,000		$ 2,360,000
Custodial Accounts		16,000				16,000		$ 11,100
Servicing Asset at Amortized Value, Balance [Roll Forward]
Balance, net of valuation allowance, beginning of the period		14,417		14,617		14,638	14,738
Additions—amounts capitalized		685		863		1,357	1,684
Amortization		(1,126)	[1]	(989)	[1]	(2,066)	(1,946)
Balance, net of valuation allowance, end of the period	[2]	13,998		$ 14,521		13,998	$ 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 June 30, 2019 and 2018.