INCOME TAXES - Schedule of Income Tax Rates (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed statutory federal income tax provision	$ 66,178	$ 73,028	$ 32,902
State taxes, net of federal tax benefit	17,992	19,728	8,754
Low Income Housing Project Investments	(3,740)	(3,364)	(2,308)
Nontaxable interest, net	(3,508)	(3,191)	(1,022)
Increase in cash surrender value of life insurance	(2,133)	(1,885)	(1,405)
Effective Income Tax Rate Reconciliation, Increase in uncertain positions, amount	$ (655)	$ (1,035)	$ 50
Effective Income Tax Rate Reconciliation, Revaluation of Net Deferred Tax Asset, Percent	0.08%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Revaluation of Net Deferred Tax Assets	$ 255	$ 0	$ 0
Stock-based compensation	(127)	(202)	(372)
Change in valuation allowance	$ 109	$ 52	$ 26
Other tax credits	(0.02%)	0.00%	0.00%
Merger and other related costs (non-deductible)	$ 0	$ 0	$ 630
Other tax credits	(76)	0	0
Other, net	1,337	810	(1,572)
Income tax benefit	$ 75,632	$ 83,941	$ 35,683
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Computed statutory federal income tax provision	21.00%	21.00%	21.00%
State taxes, net of federal tax benefit	5.71%	5.67%	5.59%
Low Income Housing Project Investments	(1.19%)	(0.97%)	(1.47%)
Nontaxable interest, net	(1.11%)	(0.92%)	(0.65%)
Increase in cash surrender value of life insurance	(0.68%)	(0.54%)	(0.90%)
Increase (decrease) in uncertain positions	(0.21%)	(0.30%)	0.03%
Stock-based compensation	(0.04%)	(0.06%)	(0.24%)
Change in valuation allowance	0.03%	0.01%	0.02%
Merger and other related costs (non-deductible)	0.00%	0.00%	0.40%
Other, net	0.43%	0.25%	(1.00%)
Total expense	24.00%	24.14%	22.78%