GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016	Dec. 31, 2015
Servicing Asset at Amortized Value, Balance [Roll Forward]
Additions—acquired through business combinations		$ 0	$ 0	$ 0	$ 2,172
Valuation adjustments in the period				0	0
Mortgage Servicing Rights [Member]
Morgage Servicing Rights at Amortized Value [Line Items]
Loans Serviced For Others						$ 2,010,000	$ 1,860,000
Custodial Accounts						$ 13,700	$ 8,700
Servicing Asset at Amortized Value, Balance [Roll Forward]
Balance, net of valuation allowance, beginning of the period		14,276	12,329	13,354	9,030
Additions—amounts capitalized		1,652	1,360	4,371	4,052
Amortization	[1]	(1,102)	(810)	(2,899)	(2,375)
Balance, net of valuation allowance, end of the period	[2]	14,826	$ 12,879	14,826	$ 12,879
Valuation allowance, end of period	[2]	$ 0		$ 0

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

[2] There was no valuation allowance as of September 30, 2016 and 2015.