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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	Mar. 31, 2023	Dec. 31, 2022
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	$ 2,960	$ 40,176
Less Than Twelve Months, Fair Value	62,250	443,798
Over Twelve Months, Gross Unrealized Losses	211,623	198,391
Over Twelve Months, Fair Value	1,299,169	938,147
Total Gross Unrealized Losses	214,583	238,567
Total Fair Value	1,361,419	1,381,945
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	1,698	8,958
Less Than Twelve Months, Fair Value	84,259	187,307
Over Twelve Months, Gross Unrealized Losses	66,998	67,730
Over Twelve Months, Fair Value	301,064	239,115
Total Gross Unrealized Losses	68,696	76,688
Total Fair Value	385,323	426,422
Securities available for sale and held to maturity
Less Than Twelve Months, Gross Unrealized Losses	4,658	49,134
Less Than Twelve Months, Fair Value	146,509	631,105
Over Twelve Months, Gross Unrealized Losses	278,621	266,121
Over Twelve Months, Fair Value	1,600,233	1,177,262
Total Gross Unrealized Losses	283,279	315,255
Total Fair Value	1,746,742	1,808,367
Municipal bonds and obligations
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	356	2,406
Less Than Twelve Months, Fair Value	13,295	36,696
Over Twelve Months, Gross Unrealized Losses	1,625	624
Over Twelve Months, Fair Value	15,813	2,763
Total Gross Unrealized Losses	1,981	3,030
Total Fair Value	29,108	39,459
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	633	5,476
Less Than Twelve Months, Fair Value	46,988	125,494
Over Twelve Months, Gross Unrealized Losses	18,627	18,228
Over Twelve Months, Fair Value	78,012	38,341
Total Gross Unrealized Losses	19,260	23,704
Total Fair Value	125,000	163,835
Agency collateralized mortgage obligations
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	250	23,052
Less Than Twelve Months, Fair Value	9,999	247,509
Over Twelve Months, Gross Unrealized Losses	86,528	76,735
Over Twelve Months, Fair Value	515,950	284,434
Total Gross Unrealized Losses	86,778	99,787
Total Fair Value	525,949	531,943
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	1,065	2,734
Less Than Twelve Months, Fair Value	37,271	49,539
Over Twelve Months, Gross Unrealized Losses	16,976	17,686
Over Twelve Months, Fair Value	69,023	58,177
Total Gross Unrealized Losses	18,041	20,420
Total Fair Value	106,294	107,716
Agency mortgage-backed securities
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	142	3,124
Less Than Twelve Months, Fair Value	4,110	37,540
Over Twelve Months, Gross Unrealized Losses	88,505	93,872
Over Twelve Months, Fair Value	535,398	508,683
Total Gross Unrealized Losses	88,647	96,996
Total Fair Value	539,508	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	8,511	8,940
Over Twelve Months, Fair Value	41,641	39,299
Total Gross Unrealized Losses	8,511	9,240
Total Fair Value	41,641	41,718
Agency commercial mortgage-backed securities
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	911	9,885
Less Than Twelve Months, Fair Value	10,783	96,396
Over Twelve Months, Gross Unrealized Losses	32,848	25,865
Over Twelve Months, Fair Value	216,624	132,043
Total Gross Unrealized Losses	33,759	35,750
Total Fair Value	227,407	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	22,781	22,756
Over Twelve Months, Fair Value	111,399	102,290
Total Gross Unrealized Losses	22,781	23,203
Total Fair Value	111,399	112,003
Corporate bonds
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	1,301	1,709
Less Than Twelve Months, Fair Value	24,063	25,657
Over Twelve Months, Gross Unrealized Losses	2,051	1,229
Over Twelve Months, Fair Value	15,089	9,929
Total Gross Unrealized Losses	3,352	2,938
Total Fair Value	39,152	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	103	120
Over Twelve Months, Fair Value	989	1,008
Total Gross Unrealized Losses	103	121
Total Fair Value	$ 989	$ 1,150

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