FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Cash and cash equivalents	$ 145,315	$ 919,713
Securities available-for-sale	1,257,101	1,751,832
Securities held-to-maturity	691,484	0
Loans held for sale	4,443	7,678
Net LHFI	3,735,240	2,928,811
Interest receivable	27,723	23,256
Derivative Assets	12,825
Liabilities:
Non-interest-bearing deposits	1,630,203	1,550,381
Interest-bearing	3,864,201	3,676,403
Subordinated debentures	145,027	144,726
Interest payable	3,324	1,711
Derivative Liabilities	12,825
Interest rate swaps
Assets:
Derivative Assets	12,825
Liabilities:
Derivative Liabilities	12,825
Carrying Amount
Assets:
Cash and cash equivalents	145,315	919,713
Securities available-for-sale	1,257,101	1,751,832
Securities held-to-maturity	691,484
Loans held for sale	4,443	7,678
Net LHFI	3,735,240	2,928,811
Interest receivable	27,723	23,256
Liabilities:
Non-interest-bearing deposits	1,630,203	756,118
Interest-bearing	3,864,201	4,470,666
Subordinated debentures	145,027	144,726
FHLB and other borrowings	130,100
Interest payable	3,324	1,711
Carrying Amount | Interest rate swaps
Assets:
Derivative Assets	12,825
Liabilities:
Derivative Liabilities	12,825
Estimated Fair Value
Assets:
Cash and cash equivalents	145,315	919,713
Securities available-for-sale	1,257,101	1,751,832
Securities held-to-maturity	642,097
Loans held for sale	4,443	7,678
Net LHFI	3,681,313	2,956,278
Interest receivable	27,723	23,256
Liabilities:
Non-interest-bearing deposits	1,630,203	756,118
Interest-bearing	3,505,990	4,431,771
Subordinated debentures	133,816	156,952
FHLB and other borrowings	130,100
Interest payable	3,324	1,711
Estimated Fair Value | Interest rate swaps
Assets:
Derivative Assets	12,825
Liabilities:
Derivative Liabilities	12,825
Quoted Prices in Active Markets For Identical Assets (Level 1)
Assets:
Cash and cash equivalents	145,315	919,713
Securities available-for-sale	123,854	135,158
Securities held-to-maturity	0
Loans held for sale	0	0
Net LHFI	0	0
Interest receivable	0	0
Derivative Assets	0
Liabilities:
Non-interest-bearing deposits	0	0
Interest-bearing	0	0
Subordinated debentures	0	0
FHLB and other borrowings	0
Interest payable	0	0
Derivative Liabilities	0
Quoted Prices in Active Markets For Identical Assets (Level 1) | Interest rate swaps
Assets:
Derivative Assets	0
Liabilities:
Derivative Liabilities	0
Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	1,118,099	1,596,508
Securities held-to-maturity	642,097
Loans held for sale	4,443	7,678
Net LHFI	0	0
Interest receivable	9,757	6,838
Derivative Assets	12,825
Liabilities:
Non-interest-bearing deposits	1,630,203	756,118
Interest-bearing	3,505,990	4,431,771
Subordinated debentures	0	0
FHLB and other borrowings	130,100
Interest payable	3,324	1,711
Derivative Liabilities	12,825
Significant Other Observable Inputs (Level 2) | Interest rate swaps
Assets:
Derivative Assets	12,825
Liabilities:
Derivative Liabilities	12,825
Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	15,148	20,166
Securities held-to-maturity	0
Loans held for sale	0	0
Net LHFI	3,681,313	2,956,278
Interest receivable	17,966	16,418
Derivative Assets	0
Liabilities:
Non-interest-bearing deposits	0	0
Interest-bearing	0	0
Subordinated debentures	133,816	156,952
FHLB and other borrowings	0
Interest payable	0	$ 0
Derivative Liabilities	0
Significant Unobservable Inputs (Level 3) | Interest rate swaps
Assets:
Derivative Assets	0
Liabilities:
Derivative Liabilities	$ 0