INVESTMENT SECURITIES - Schedule of Investment Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Fair Value
Less than 12 Months	$ 67,007	$ 1,423,379
12 Months or Longer	1,493,547	487,129
Total	1,560,554	1,910,508
Gross Unrealized Losses
Less than 12 Months	1,101	172,828
12 Months or Longer	219,453	124,297
Total	$ 220,554	$ 297,125
Number of Securities | security	865	1,154
U.S. Treasury
Fair Value
Less than 12 Months		$ 2,459
12 Months or Longer		0
Total		2,459
Gross Unrealized Losses
Less than 12 Months		42
12 Months or Longer		0
Total		$ 42
Number of Securities | security		5
U.S. Government-sponsored agency securities
Fair Value
Less than 12 Months	$ 0	$ 48,940
12 Months or Longer	95,307	53,022
Total	95,307	101,962
Gross Unrealized Losses
Less than 12 Months	0	4,973
12 Months or Longer	16,214	12,219
Total	$ 16,214	$ 17,192
Number of Securities | security	14	16
State and municipal
Fair Value
Less than 12 Months	$ 55,514	$ 1,177,104
12 Months or Longer	963,584	108,652
Total	1,019,098	1,285,756
Gross Unrealized Losses
Less than 12 Months	1,076	150,096
12 Months or Longer	115,146	28,630
Total	$ 116,222	$ 178,726
Number of Securities | security	691	946
U.S. Government-sponsored mortgage-backed securities
Fair Value
Less than 12 Months	$ 11,493	$ 182,700
12 Months or Longer	422,868	325,455
Total	434,361	508,155
Gross Unrealized Losses
Less than 12 Months	25	16,910
12 Months or Longer	86,965	83,448
Total	$ 86,990	$ 100,358
Number of Securities | security	150	177
Corporate obligations
Fair Value
Less than 12 Months	$ 0	$ 12,176
12 Months or Longer	11,788	0
Total	11,788	12,176
Gross Unrealized Losses
Less than 12 Months	0	807
12 Months or Longer	1,128	0
Total	$ 1,128	$ 807
Number of Securities | security	10	10