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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, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Financial assets |  |  |
Investment securities held-to-maturity |  | $ 71,595 | $ 76,960
Other investments (1) |  | 117,120 | 114,598
Interest Receivable |  | 52,193 | 53,200
Deposits |  |  |
Noninterest-bearing |  | 3,127,512 | 3,132,381
Savings |  | 5,029,097 | 4,948,768
Time |  | 3,293,707 | 3,152,265
Federal Home Loan Bank Stock and Federal Reserve Bank Stock |  | $ 104,400 | 103,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | 11.52% | 11.63% |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | 5.96% | 6.29% |
Impaired Commercial And Commercial Real Estate Loans Member |  |  |
Deposits |  |  |
Principal Amount of Commercial and Commercial Real Estate Loans |  | $ 23,900 | 3,900
Allowance for Loan and Lease Losses, Real Estate |  | 10,100 | 2,100
Carrying value |  |  |
Financial assets |  |  |
Cash and interest-bearing deposits with other banks |  | 739,739 | 904,486
Investment securities held-to-maturity |  | 71,595 | 76,960
Other investments (1) |  | 12,739 | 11,570
Loans and leases |  | 11,552,635 | 11,604,987
Interest Receivable |  | 66,865 | 67,420
Deposits |  |  |
Deposits |  | 14,433,448 | 14,329,138
Short-term borrowings |  | 595,167 | 755,452
Long-term debt |  | 221,823 | 347,509
Interest Payable |  | 35,301 | 43,411
Fair value |  |  |
Financial assets |  |  |
Cash and interest-bearing deposits with other banks |  | 739,739 | 904,486
Investment securities held-to-maturity |  | 65,911 | 68,989
Other investments (1) |  | 12,739 | 11,570
Loans and leases |  | 11,444,671 | 11,417,941
Interest Receivable |  | 66,865 | 67,420
Deposits |  |  |
Deposits |  | 14,427,984 | 14,322,815
Short-term borrowings |  | 595,167 | 755,452
Long-term debt |  | 227,368 | 346,613
Interest Payable |  | 35,301 | 43,411
Fair Value, Inputs, Level 1 [Member] | Fair value |  |  |
Financial assets |  |  |
Cash and interest-bearing deposits with other banks |  | 739,739 | 904,486
Investment securities held-to-maturity |  | 0 | 0
Other investments (1) |  | 1,691 | 1,530
Loans and leases |  | 0 | 0
Interest Receivable |  | 0 | 0
Deposits |  |  |
Deposits |  | 0 | 0
Short-term borrowings |  | 595,167 | 755,452
Long-term debt |  | 0 | 0
Interest Payable |  | 4,750 | 4,663
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 |  | 65,911 | 68,989
Other investments (1) |  | 40 | 40
Loans and leases |  | 0 | 0
Interest Receivable |  | 14,672 | 14,263
Deposits |  |  |
Deposits |  | 14,427,984 | 14,322,815
Short-term borrowings |  | 0 | 0
Long-term debt |  | 227,368 | 346,613
Interest Payable |  | 30,551 | 38,748
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 (1) |  | 11,008 | 10,000
Loans and leases |  | 11,444,671 | 11,417,941
Interest Receivable |  |  | 53,157
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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