INCOME TAXES - Schedule of Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Allowance for credit losses	$ 88,494	$ 64,742
Deferred compensation	13,822	13,287
Deferred loan fees	0	668
Purchase accounting adjustments	3,442	5,153
Other real estate owned	18	201
Net operating loss tax carryforward	12,779	14,070
Tax credit carryforwards	139	149
Unrealized loss on securities available for sale	11,218	14,635
Capitalized costs, accrued expenses and other	8,297	3,432
Lease liability	15,081	16,505
Deferred tax assets, net of valuation allowance, total	153,290	132,842
Deferred tax liabilities
Premises and equipment	12,167	12,680
Mortgage servicing rights	34,989	30,903
Subordinated debentures	6,149	6,551
Lease financing	9,753	9,442
Goodwill and intangible assets	22,918	24,946
Origination costs	9,984	6,239
Right of use lease asset	12,854	14,280
Deferred loan fees	318	0
Deferred tax liabilities	109,132	105,041
Net deferred tax asset (liability)	$ 44,158	$ 27,801