FAIR VALUE - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	$ 1,807,586	$ 1,773,765
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable
Accrued interest receivable	$ 34,100	26,000
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	371,705	757,509
Available for sale securities	1,807,586	1,773,765
Loans held for investment, net of allowance	7,661,571	4,172,546
Accrued interest receivable	44,743	33,392
Deposits	9,267,632	6,047,639
Accrued interest payable	2,098	1,753
Borrowed funds	63,925	89,956
Subordinated debt	109,367	108,847
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	371,705	757,509
Available for sale securities	1,807,586	1,773,765
Loans held for investment, net of allowance	7,555,602	4,143,552
Accrued interest receivable	44,743	33,394
Deposits	9,256,141	6,046,050
Accrued interest payable	2,098	1,753
Borrowed funds	63,999	73,699
Subordinated debt	107,910	113,355
Estimated Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	371,705	757,509
Available for sale securities	0	0
Loans held for investment, net of allowance	0	0
Accrued interest receivable	25	6
Deposits	0	0
Accrued interest payable	0	0
Borrowed funds	0	0
Subordinated debt	0	0
Estimated Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Available for sale securities	1,807,586	1,773,765
Loans held for investment, net of allowance	0	0
Accrued interest receivable	10,585	7,435
Deposits	9,256,141	6,046,050
Accrued interest payable	2,098	1,753
Borrowed funds	63,999	73,699
Subordinated debt	107,910	113,355
Estimated Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Available for sale securities	0	0
Loans held for investment, net of allowance	7,555,602	4,143,552
Accrued interest receivable	34,133	25,953
Deposits	0	0
Accrued interest payable	0	0
Borrowed funds	0	0
Subordinated debt	$ 0	$ 0