INCOME TAXES - Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Allowance for credit losses	$ 64,742	$ 50,132
Deferred compensation	13,287	7,816
Deferred loan fees	668	1,593
Purchase accounting adjustments	5,153	14,008
Other real estate owned	201	334
Net operating loss tax carryforward	14,070	35,082
Tax credit carryforwards	149	315
Unrealized loss on securities available for sale	14,635	0
Capitalized costs, accrued expenses and other	3,432	2,208
Lease liability	16,505	16,186
Deferred tax assets, net of valuation allowance, total	132,842	127,674
Deferred tax liabilities
Premises and equipment	12,680	13,130
Mortgage servicing rights	30,903	52,076
Subordinated debentures	6,551	6,818
Lease financing	9,442	42,865
Goodwill and intangible assets	24,946	29,393
Unrealized gain on securities available-for-sale	0	4,498
Origination costs	6,239	0
Right of use lease asset	14,280	14,001
Deferred tax liabilities	105,041	162,781
Net deferred tax asset (liability)	$ 27,801
Net deferred tax asset (liability)		$ (35,107)