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FAIR VALUES OF FINANCIAL INSTRUMENTS - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Cash and due from banks | $ 87,616 | $ 112,649
Investment securities held to maturity | 1,723,520 | 1,870,374
Loans held for sale | 18,663 | 18,934
Total Fair Value |  |
Assets: |  |
Cash and due from banks | 87,616 | 112,649
Interest-bearing deposits | 298,891 | 436,080
Investment securities held to maturity | 1,723,520 | 1,870,374
Loans held for sale | 18,663 | 18,934
Loans | 12,437,523 | 11,958,301
Federal Home Loan Bank stock | 41,690 | 41,769
Interest receivable | 91,829 | 97,664
Liabilities at December 31: |  |
Deposits | 14,513,167 | 14,811,957
Borrowings: |  |
Securities sold under repurchase agreements | 142,865 | 157,265
Federal Home Loan Bank advances | 816,786 | 707,377
Subordinated debentures and other borrowings | 84,108 | 149,995
Interest payable | 16,102 | 18,912
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and due from banks | 87,616 | 112,649
Interest-bearing deposits | 298,891 | 436,080
Investment securities held to maturity | 0 | 0
Loans held for sale | 0 | 0
Loans | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Interest receivable | 0 | 0
Liabilities at December 31: |  |
Deposits | 12,502,819 | 12,482,295
Borrowings: |  |
Securities sold under repurchase agreements | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Subordinated debentures and other borrowings | 0 | 0
Interest payable | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash and due from banks | 0 | 0
Interest-bearing deposits | 0 | 0
Investment securities held to maturity | 1,716,647 | 1,859,974
Loans held for sale | 18,663 | 18,934
Loans | 0 | 0
Federal Home Loan Bank stock | 41,690 | 41,769
Interest receivable | 91,829 | 97,664
Liabilities at December 31: |  |
Deposits | 2,010,348 | 2,329,662
Borrowings: |  |
Securities sold under repurchase agreements | 142,865 | 157,265
Federal Home Loan Bank advances | 816,786 | 707,377
Subordinated debentures and other borrowings | 84,108 | 149,995
Interest payable | 16,102 | 18,912
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and due from banks | 0 | 0
Interest-bearing deposits | 0 | 0
Investment securities held to maturity | 6,873 | 10,400
Loans held for sale | 0 | 0
Loans | 12,437,523 | 11,958,301
Federal Home Loan Bank stock | 0 | 0
Interest receivable | 0 | 0
Liabilities at December 31: |  |
Deposits | 0 | 0
Borrowings: |  |
Securities sold under repurchase agreements | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Subordinated debentures and other borrowings | 0 | 0
Interest payable | 0 | 0
Carrying Amount |  |
Assets: |  |
Cash and due from banks | 87,616 | 112,649
Interest-bearing deposits | 298,891 | 436,080
Investment securities held to maturity | 2,074,220 | 2,184,252
Loans held for sale | 18,663 | 18,934
Loans | 12,661,602 | 12,281,093
Federal Home Loan Bank stock | 41,690 | 41,769
Interest receivable | 91,829 | 97,664
Liabilities at December 31: |  |
Deposits | 14,521,626 | 14,821,453
Borrowings: |  |
Securities sold under repurchase agreements | 142,876 | 157,280
Federal Home Loan Bank advances | 822,554 | 712,852
Subordinated debentures and other borrowings | 93,529 | 158,644
Interest payable | $ 16,102 | $ 18,912

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