REVENUE FROM CONTRACTS WITH CUSTOMERS (Schedule of Noninterest Income by Operating Segment) (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019		Jun. 30, 2018
Service charges on deposits
Overdraft fees		$ 164		$ 183		$ 324		$ 364
Interchange income		322		326		586		616
Other		411		364		803		724
Wealth management fees	[1]	9,568		8,126		18,742		16,493
Other		2,561	[2]	2,741	[2]	4,300	[1]	3,758	[1]
Total other income		13,026		11,740		24,755		21,955
Banking [Member]
Service charges on deposits
Overdraft fees		164		183		324		364
Interchange income		322		326		586		616
Other		411		364		803		724
Wealth management fees	[1]	0		0
Other		2,254	[2]	2,480	[2]	3,717	[1]	3,276	[1]
Total other income		3,151		3,353		5,430		4,980
Wealth Management Division [Member]
Service charges on deposits
Overdraft fees		0		0		0		0
Interchange income		0		0		0		0
Other		0		0		0		0
Wealth management fees	[1]	9,568		8,126		18,742		16,493
Other		307	[2]	261	[2]	583	[1]	482	[1]
Total other income		$ 9,875		$ 8,387		$ 19,325		$ 16,975

[1] Includes investment brokerage fees.

[2] All of the other category is outside the scope of ASC 606.