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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Summary of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Securities available for sale
Amortized Cost	$ 1,397,722	$ 1,421,273
Gross Unrealized Gains	16,174	4,065
Gross Unrealized Losses	(3,818)	(25,691)
Fair Value	1,410,078	1,399,647
Securities held to maturity
Amortized Cost	364,463	373,763
Gross Unrealized Gains	14,028	4,124
Gross Unrealized Losses	(1,435)	(6,663)
Fair Value	377,056	371,224
Marketable equity securities, amortized cost	55,831	55,471
Marketable equity securities, gross unrealized gains	4,820	4,370
Marketable equity securities, gross unrealized losses	(1,073)	(3,203)
Marketable equity securities, fair value	59,578	56,638
Total, amortized cost basis	1,818,016	1,850,507
Total, gross unrealized gain	35,022	12,559
Total, gross unrealized loss	(6,326)	(35,557)
Total, fair value	1,846,712	1,827,509
Municipal bonds and obligations
Securities available for sale
Amortized Cost	114,401	109,648
Gross Unrealized Gains	5,477	2,272
Gross Unrealized Losses	(5)	(713)
Fair Value	119,873	111,207
Securities held to maturity
Amortized Cost	257,232	264,524
Gross Unrealized Gains	10,835	3,569
Gross Unrealized Losses	0	(3,601)
Fair Value	268,067	264,492
Agency collateralized mortgage obligations
Securities available for sale
Amortized Cost	882,124	944,946
Gross Unrealized Gains	7,419	1,130
Gross Unrealized Losses	(581)	(15,192)
Fair Value	888,962	930,884
Securities held to maturity
Amortized Cost	70,726	71,637
Gross Unrealized Gains	2,975	533
Gross Unrealized Losses	(115)	(778)
Fair Value	73,586	71,392
Agency mortgage-backed securities
Securities available for sale
Amortized Cost	182,598	175,406
Gross Unrealized Gains	739	36
Gross Unrealized Losses	(1,079)	(5,121)
Fair Value	182,258	170,321
Securities held to maturity
Amortized Cost	6,758	7,219
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(57)	(297)
Fair Value	6,701	6,922
Agency commercial mortgage-backed securities
Securities available for sale
Amortized Cost	61,275	62,200
Gross Unrealized Gains	465	0
Gross Unrealized Losses	(1,089)	(3,275)
Fair Value	60,651	58,925
Securities held to maturity
Amortized Cost	10,385	10,417
Gross Unrealized Gains	46	0
Gross Unrealized Losses	0	(289)
Fair Value	10,431	10,128
Corporate bonds
Securities available for sale
Amortized Cost	119,917	112,404
Gross Unrealized Gains	880	342
Gross Unrealized Losses	(1,054)	(1,256)
Fair Value	119,743	111,490
Trust preferred securities
Securities available for sale
Amortized Cost	8,323	8,314
Gross Unrealized Gains	231	251
Gross Unrealized Losses	(4)	(99)
Fair Value	8,550	8,466
Other bonds and obligations
Securities available for sale
Amortized Cost	29,084	8,355
Gross Unrealized Gains	963	34
Gross Unrealized Losses	(6)	(35)
Fair Value	30,041	8,354
Securities held to maturity
Amortized Cost	299	248
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	299	248
Tax advantaged economic development bonds
Securities held to maturity
Amortized Cost	19,063	19,718
Gross Unrealized Gains	172	22
Gross Unrealized Losses	(1,263)	(1,698)
Fair Value	$ 17,972	$ 18,042

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