FAIR VALUE - Schedule of Estimated Fair Values and Related Carrying Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financial Assets:
Securities available-for-sale	$ 1,031,938	$ 991,426
Securities held-to-maturity	113,804	113,107
Borrowings - Federal Home Loan Bank advances:
Short-term advance	55,000	0
Long-term advance	1,200	0
Carrying Value
Financial Assets:
Cash and cash equivalents	192,836	168,205
Securities available-for-sale	1,031,938	991,426
Securities held-to-maturity	132,799	131,568
Real estate mortgages held-for-sale	725	1,700
Loans, net	5,180,451	5,031,988
Mortgage banking derivative	73	94
Interest rate swap derivative	15,641	25,403
Federal Reserve and Federal Home Loan Bank Stock	21,420	21,420
Accrued interest receivable	28,667	28,446
Financial Liabilities:
Certificates of deposit	785,749	855,876
All other deposits	5,238,569	5,045,090
Borrowings - Federal Home Loan Bank advances:
Short-term advance	55,000
Long-term advance	1,200
Mortgage banking derivative	1
Interest rate swap derivative	15,642	25,403
Standby letters of credit	262	294
Accrued interest payable	8,628	15,117
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	192,836	168,205
Securities available-for-sale	1,031,938	991,426
Securities held-to-maturity	113,804	113,107
Real estate mortgages held-for-sale	739	1,733
Loans, net	5,110,207	4,916,231
Mortgage banking derivative	73	94
Interest rate swap derivative	15,641	25,403
Accrued interest receivable	28,667	28,446
Financial Liabilities:
Certificates of deposit	783,237	851,933
All other deposits	5,238,569	5,045,090
Borrowings - Federal Home Loan Bank advances:
Short-term advance	55,000
Long-term advance	781
Mortgage banking derivative	1
Interest rate swap derivative	15,642	25,403
Standby letters of credit	262	285
Accrued interest payable	8,628	15,117
Level 1 | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	192,836	168,205
Securities available-for-sale	5,001	0
Securities held-to-maturity	0	0
Real estate mortgages held-for-sale	0	0
Loans, net	0	0
Mortgage banking derivative	0	0
Interest rate swap derivative	0	0
Accrued interest receivable	0	0
Financial Liabilities:
Certificates of deposit	0	0
All other deposits	5,238,569	5,045,090
Borrowings - Federal Home Loan Bank advances:
Short-term advance	55,000
Long-term advance	0
Mortgage banking derivative	0
Interest rate swap derivative	0	0
Standby letters of credit	0	0
Accrued interest payable	430	425
Level 2 | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	1,022,487	986,766
Securities held-to-maturity	113,804	113,107
Real estate mortgages held-for-sale	739	1,733
Loans, net	0	0
Mortgage banking derivative	73	94
Interest rate swap derivative	15,641	25,403
Accrued interest receivable	7,730	8,178
Financial Liabilities:
Certificates of deposit	783,237	851,933
All other deposits	0	0
Borrowings - Federal Home Loan Bank advances:
Short-term advance	0
Long-term advance	781
Mortgage banking derivative	1
Interest rate swap derivative	15,642	25,403
Standby letters of credit	0	0
Accrued interest payable	8,198	14,692
Level 3 | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	4,450	4,660
Securities held-to-maturity	0	0
Real estate mortgages held-for-sale	0	0
Loans, net	5,110,207	4,916,231
Mortgage banking derivative	0	0
Interest rate swap derivative	0	0
Accrued interest receivable	20,937	20,268
Financial Liabilities:
Certificates of deposit	0	0
All other deposits	0	0
Borrowings - Federal Home Loan Bank advances:
Short-term advance	0
Long-term advance	0
Mortgage banking derivative	0
Interest rate swap derivative	0	0
Standby letters of credit	262	285
Accrued interest payable	$ 0	$ 0