FAIR VALUE DISCLOSURES AND REPORTING, THE FAIR VALUE OPTION AND FAIR VALUE MEASUREMENTS - Schedule of Fair Values of Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets:
Cash and cash equivalents	$ 214,135	$ 355,147
Securities available-for-sale	1,060,014	1,039,322
Securities held-to-maturity	574,750	615,944
Loans, net	5,262,890	5,116,010
Accrued interest receivable	33,384	33,300
Liabilities:
Noninterest-bearing deposits	1,796,746	1,849,013
Interest-bearing deposits	4,763,966	4,613,859
Subordinated debentures	123,645	123,386
Accrued interest payable	13,720	22,702
Quoted Prices (Level 1)
Assets:
Cash and cash equivalents	214,135	355,147
Securities available-for-sale	5,181	16,675
Securities held-to-maturity	0	0
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Liabilities:
Noninterest-bearing deposits	0	0
Interest-bearing deposits	0	0
Subordinated debentures	0	0
FHLB and other borrowings	0	0
Accrued interest payable	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	1,028,714	1,004,434
Securities held-to-maturity	574,750	615,944
Loans held for sale	2,987	2,914
Loans, net	0	0
Accrued interest receivable	7,342	8,632
Liabilities:
Noninterest-bearing deposits	1,796,746	1,849,013
Interest-bearing deposits	4,702,034	4,430,227
Subordinated debentures	0	0
FHLB and other borrowings	207,500	390,000
Accrued interest payable	13,720	22,702
Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	26,119	18,213
Securities held-to-maturity	0	0
Loans held for sale	0	0
Loans, net	5,023,940	4,877,935
Accrued interest receivable	26,042	24,668
Liabilities:
Noninterest-bearing deposits	0	0
Interest-bearing deposits	0	0
Subordinated debentures	112,327	109,426
FHLB and other borrowings	0	0
Accrued interest payable	0	0
Carrying Amount
Assets:
Cash and cash equivalents	214,135	355,147
Securities available-for-sale	1,060,014	1,039,322
Securities held-to-maturity	602,328	654,539
Loans held for sale	2,987	2,914
Loans, net	5,262,890	5,116,010
Accrued interest receivable	33,384	33,300
Liabilities:
Noninterest-bearing deposits	1,796,746	1,849,013
Interest-bearing deposits	4,763,966	4,613,859
Subordinated debentures	123,645	123,386
FHLB and other borrowings	207,500	390,000
Accrued interest payable	13,720	22,702
Estimated Fair Value
Assets:
Cash and cash equivalents	214,135	355,147
Securities available-for-sale	1,060,014	1,039,322
Securities held-to-maturity	574,750	615,944
Loans held for sale	2,987	2,914
Loans, net	5,023,940	4,877,935
Accrued interest receivable	33,384	33,300
Liabilities:
Noninterest-bearing deposits	1,796,746	1,849,013
Interest-bearing deposits	4,702,034	4,430,227
Subordinated debentures	112,327	109,426
FHLB and other borrowings	207,500	390,000
Accrued interest payable	13,720	22,702
Interest rate swap contracts
Assets:
Interest rate swaps	11,389	12,170
Liabilities:
Interest rate swaps	11,388	12,175
Interest rate swap contracts | Quoted Prices (Level 1)
Assets:
Interest rate swaps	0	0
Liabilities:
Interest rate swaps	0	0
Interest rate swap contracts | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate swaps	11,352	12,129
Liabilities:
Interest rate swaps	11,352	12,129
Interest rate swap contracts | Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swaps	37	41
Liabilities:
Interest rate swaps	36	46
Interest rate swap contracts | Carrying Amount
Assets:
Interest rate swaps	11,389	12,170
Liabilities:
Interest rate swaps	11,388	12,175
Interest rate swap contracts | Estimated Fair Value
Assets:
Interest rate swaps	11,389	12,170
Liabilities:
Interest rate swaps	$ 11,388	$ 12,175