SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES - Schedule of Securities with Unrealized Losses, Segregated by the Duration of their Continuous Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	$ 2,926	$ 40,176
Less Than Twelve Months, Fair Value	52,392	443,798
Over Twelve Months, Gross Unrealized Losses	235,691	198,391
Over Twelve Months, Fair Value	1,257,842	938,147
Total Gross Unrealized Losses	238,617	238,567
Total Fair Value	1,310,234	1,381,945
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	3,419	8,958
Less Than Twelve Months, Fair Value	123,807	187,307
Over Twelve Months, Gross Unrealized Losses	72,794	67,730
Over Twelve Months, Fair Value	288,625	239,115
Total Gross Unrealized Losses	76,213	76,688
Total Fair Value	412,432	426,422
Securities available for sale and held to maturity
Less Than Twelve Months, Gross Unrealized Losses	6,345	49,134
Less Than Twelve Months, Fair Value	176,199	631,105
Over Twelve Months, Gross Unrealized Losses	308,485	266,121
Over Twelve Months, Fair Value	1,546,467	1,177,262
Total Gross Unrealized Losses	314,830	315,255
Total Fair Value	1,722,666	1,808,367
Municipal bonds and obligations
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	550	2,406
Less Than Twelve Months, Fair Value	24,993	36,696
Over Twelve Months, Gross Unrealized Losses	1,943	624
Over Twelve Months, Fair Value	17,862	2,763
Total Gross Unrealized Losses	2,493	3,030
Total Fair Value	42,855	39,459
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	1,710	5,476
Less Than Twelve Months, Fair Value	89,477	125,494
Over Twelve Months, Gross Unrealized Losses	19,695	18,228
Over Twelve Months, Fair Value	74,807	38,341
Total Gross Unrealized Losses	21,405	23,704
Total Fair Value	164,284	163,835
Agency collateralized mortgage obligations
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	113	23,052
Less Than Twelve Months, Fair Value	2,276	247,509
Over Twelve Months, Gross Unrealized Losses	99,846	76,735
Over Twelve Months, Fair Value	489,064	284,434
Total Gross Unrealized Losses	99,959	99,787
Total Fair Value	491,340	531,943
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	1,709	2,734
Less Than Twelve Months, Fair Value	34,330	49,539
Over Twelve Months, Gross Unrealized Losses	18,760	17,686
Over Twelve Months, Fair Value	65,550	58,177
Total Gross Unrealized Losses	20,469	20,420
Total Fair Value	99,880	107,716
Agency mortgage-backed securities
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	157	3,124
Less Than Twelve Months, Fair Value	2,648	37,540
Over Twelve Months, Gross Unrealized Losses	92,448	93,872
Over Twelve Months, Fair Value	515,824	508,683
Total Gross Unrealized Losses	92,605	96,996
Total Fair Value	518,472	546,223
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	0	300
Less Than Twelve Months, Fair Value	0	2,419
Over Twelve Months, Gross Unrealized Losses	8,973	8,940
Over Twelve Months, Fair Value	40,258	39,299
Total Gross Unrealized Losses	8,973	9,240
Total Fair Value	40,258	41,718
Agency commercial mortgage-backed securities
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	1,042	9,885
Less Than Twelve Months, Fair Value	9,678	96,396
Over Twelve Months, Gross Unrealized Losses	37,464	25,865
Over Twelve Months, Fair Value	210,099	132,043
Total Gross Unrealized Losses	38,506	35,750
Total Fair Value	219,777	228,439
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	0	447
Less Than Twelve Months, Fair Value	0	9,713
Over Twelve Months, Gross Unrealized Losses	25,272	22,756
Over Twelve Months, Fair Value	107,048	102,290
Total Gross Unrealized Losses	25,272	23,203
Total Fair Value	107,048	112,003
Corporate bonds
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	1,064	1,709
Less Than Twelve Months, Fair Value	12,797	25,657
Over Twelve Months, Gross Unrealized Losses	3,924	1,229
Over Twelve Months, Fair Value	24,698	9,929
Total Gross Unrealized Losses	4,988	2,938
Total Fair Value	37,495	35,586
Other bonds and obligations
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	0	0
Less Than Twelve Months, Fair Value	0	0
Over Twelve Months, Gross Unrealized Losses	66	66
Over Twelve Months, Fair Value	295	295
Total Gross Unrealized Losses	66	66
Total Fair Value	295	295
Securities held to maturity
Total Gross Unrealized Losses	0	0
Tax advantaged economic development bonds
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	0	1
Less Than Twelve Months, Fair Value	0	142
Over Twelve Months, Gross Unrealized Losses	94	120
Over Twelve Months, Fair Value	962	1,008
Total Gross Unrealized Losses	94	121
Total Fair Value	$ 962	$ 1,150

SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES - Schedule of Securities with Unrealized Losses, Segregated by the Duration of their Continuous Unrealized Loss Positions (Details) - USD ($)
$ in Thousands

Jun. 30, 2023

Dec. 31, 2022

Less Than Twelve Months, Gross Unrealized Losses

$ 2,926

$ 40,176

Less Than Twelve Months, Fair Value

52,392

443,798

Over Twelve Months, Gross Unrealized Losses

235,691

198,391

Over Twelve Months, Fair Value