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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	Sep. 30, 2024	Dec. 31, 2023
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	$ 61	$ 534
Less Than Twelve Months, Fair Value	10,885	15,891
Over Twelve Months, Gross Unrealized Losses	120,884	188,991
Over Twelve Months, Fair Value	576,912	965,075
Total Gross Unrealized Losses	120,945	189,525
Total Fair Value	587,797	980,966
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	112	230
Less Than Twelve Months, Fair Value	35,140	28,916
Over Twelve Months, Gross Unrealized Losses	61,392	67,597
Over Twelve Months, Fair Value	345,529	332,661
Total Gross Unrealized Losses	61,504	67,827
Total Fair Value	380,669	361,577
Securities available for sale and held to maturity
Less Than Twelve Months, Gross Unrealized Losses	173	764
Less Than Twelve Months, Fair Value	46,025	44,807
Over Twelve Months, Gross Unrealized Losses	182,276	256,588
Over Twelve Months, Fair Value	922,441	1,297,736
Total Gross Unrealized Losses	182,449	257,352
Total Fair Value	968,466	1,342,543
U.S. Treasuries
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	0
Less Than Twelve Months, Fair Value	0
Over Twelve Months, Gross Unrealized Losses	0
Over Twelve Months, Fair Value	0
Total Gross Unrealized Losses	0
Total Fair Value	0
Municipal bonds and obligations
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	61	76
Less Than Twelve Months, Fair Value	10,885	9,326
Over Twelve Months, Gross Unrealized Losses	1,347	1,353
Over Twelve Months, Fair Value	26,465	22,739
Total Gross Unrealized Losses	1,408	1,429
Total Fair Value	37,350	32,065
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	107	229
Less Than Twelve Months, Fair Value	34,770	28,895
Over Twelve Months, Gross Unrealized Losses	16,980	16,758
Over Twelve Months, Fair Value	115,023	92,063
Total Gross Unrealized Losses	17,087	16,987
Total Fair Value	149,793	120,958
Agency collateralized mortgage 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	56,765	79,112
Over Twelve Months, Fair Value	212,953	347,874
Total Gross Unrealized Losses	56,765	79,112
Total Fair Value	212,953	347,874
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	0	1
Less Than Twelve Months, Fair Value	0	21
Over Twelve Months, Gross Unrealized Losses	15,332	18,359
Over Twelve Months, Fair Value	87,940	94,548
Total Gross Unrealized Losses	15,332	18,360
Total Fair Value	87,940	94,569
Agency mortgage-backed securities
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	0	1
Less Than Twelve Months, Fair Value	0	22
Over Twelve Months, Gross Unrealized Losses	43,155	75,154
Over Twelve Months, Fair Value	232,132	417,151
Total Gross Unrealized Losses	43,155	75,155
Total Fair Value	232,132	417,173
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	0	0
Less Than Twelve Months, Fair Value	0	0
Over Twelve Months, Gross Unrealized Losses	7,048	8,052
Over Twelve Months, Fair Value	37,417	39,327
Total Gross Unrealized Losses	7,048	8,052
Total Fair Value	37,417	39,327
Agency commercial mortgage-backed securities
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	16,148	29,553
Over Twelve Months, Fair Value	70,566	145,326
Total Gross Unrealized Losses	16,148	29,553
Total Fair Value	70,566	145,326
Securities held to maturity
Less Than Twelve Months, Gross Unrealized Losses	0	0
Less Than Twelve Months, Fair Value	0	0
Over Twelve Months, Gross Unrealized Losses	22,001	24,368
Over Twelve Months, Fair Value	104,311	105,801
Total Gross Unrealized Losses	22,001	24,368
Total Fair Value	104,311	105,801
Corporate bonds
Securities available for sale
Less Than Twelve Months, Gross Unrealized Losses	0	457
Less Than Twelve Months, Fair Value	0	6,543
Over Twelve Months, Gross Unrealized Losses	3,403	3,753
Over Twelve Months, Fair Value	34,501	31,690
Total Gross Unrealized Losses	3,403	4,210
Total Fair Value	34,501	38,233
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	5	0
Less Than Twelve Months, Fair Value	370	0
Over Twelve Months, Gross Unrealized Losses	31	60
Over Twelve Months, Fair Value	838	922
Total Gross Unrealized Losses	36	60
Total Fair Value	$ 1,208	$ 922

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