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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2026 | Sep. 30, 2025 | Dec. 31, 2025
Financial assets |  |  |
Investment securities held-to-maturity | $ 49,631 |  | $ 58,545
Other Investments | 137,018 |  | 129,564
Interest Receivable | 57,590 |  | 54,100
Deposits |  |  |
Noninterest-bearing | 3,982,753 |  | 3,465,470
Savings | 6,460,546 |  | 5,973,532
Time | 3,817,268 |  | 3,622,227
Federal Home Loan Bank Stock and Federal Reserve Bank Stock | $ 124,400 |  | 116,700
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | 11.69% | 11.66% |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | 6.75% | 6.49% |
Impaired Commercial And Commercial Real Estate Loans Member |  |  |
Deposits |  |  |
Principal Amount of Commercial and Commercial Real Estate Loans | $ 34,200 |  | 38,100
Allowance for Loan and Lease Losses, Real Estate | 12,900 |  | 16,100
Carrying value |  |  |
Financial assets |  |  |
Cash and interest-bearing deposits with other banks | 1,202,900 |  | 775,891
Investment securities held-to-maturity | 49,631 |  | 58,545
Other Investments | 12,661 |  | 12,898
Loans and leases | 13,311,125 |  | 13,237,583
Interest Receivable | 79,692 |  | 71,940
Deposits |  |  |
Deposits | 17,918,722 |  | 16,421,842
Short-term borrowings | 620,457 |  | 675,332
Long-term debt | 380,176 |  | 514,052
Interest Payable | 39,216 |  | 38,304
Fair value |  |  |
Financial assets |  |  |
Cash and interest-bearing deposits with other banks | 1,202,900 |  | 775,891
Investment securities held-to-maturity | 45,373 |  | 54,334
Other Investments | 12,661 |  | 12,898
Loans and leases | 13,183,121 |  | 13,061,341
Interest Receivable | 79,692 |  | 71,940
Deposits |  |  |
Deposits | 17,909,049 |  | 16,415,852
Short-term borrowings | 620,457 |  | 675,332
Long-term debt | 330,944 |  | 473,291
Interest Payable | 39,216 |  | 38,304
Fair Value, Inputs, Level 1 [Member] | Fair value |  |  |
Financial assets |  |  |
Cash and interest-bearing deposits with other banks | 1,202,900 |  | 775,891
Investment securities held-to-maturity | 0 |  | 0
Other Investments | 1,613 |  | 1,850
Loans and leases | 0 |  | 0
Interest Receivable | 0 |  | 0
Deposits |  |  |
Deposits | 0 |  | 0
Short-term borrowings | 620,457 |  | 675,332
Long-term debt | 0 |  | 0
Interest Payable | 2,646 |  | 2,918
Fair Value, Inputs, Level 2 [Member] | Fair value |  |  |
Financial assets |  |  |
Cash and interest-bearing deposits with other banks | 0 |  | 0
Investment securities held-to-maturity | 45,373 |  | 54,334
Other Investments | 40 |  | 40
Loans and leases | 0 |  | 0
Interest Receivable | 22,102 |  | 17,833
Deposits |  |  |
Deposits | 17,909,049 |  | 16,415,852
Short-term borrowings | 0 |  | 0
Long-term debt | 330,944 |  | 473,291
Interest Payable | 36,570 |  | 35,386
Fair Value, Inputs, Level 3 [Member] | Fair value |  |  |
Financial assets |  |  |
Cash and interest-bearing deposits with other banks | 0 |  | 0
Investment securities held-to-maturity | 0 |  | 0
Other Investments | 11,008 |  | 11,008
Loans and leases | 13,183,121 |  | 13,061,341
Interest Receivable |  |  | 54,107
Deposits |  |  |
Deposits | 0 |  | 0
Short-term borrowings | 0 |  | 0
Long-term debt | 0 |  | 0
Interest Payable | $ 0 |  | $ 0

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 + Details
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