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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Financial assets |  |
Investment securities held-to-maturity | $ 79,542 | $ 80,321
Other investments | 125,548 | 129,945
Loans held for sale | 11,500 | 9,200
Interest Receivable | 60,130 | 56,900
Deposits |  |
Noninterest-bearing | 3,175,876 | 3,317,960
Savings | 4,467,894 | 4,331,228
Time | $ 2,896,860 | $ 2,718,390
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | 11.52% | 11.50%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | 5.91% | 5.92%
Impaired Commercial And Commercial Real Estate Loans Member |  |
Deposits |  |
Principal Amount of Commercial and Commercial Real Estate Loans | $ 5,500 | $ 19,700
Allowance for Loan and Lease Losses, Real Estate | 900 | 4,400
Carrying value |  |
Financial assets |  |
Cash and short-term investments | 950,697 | 1,006,019
Investment securities held-to-maturity | 79,542 | 80,321
Other investments | 11,324 | 20,554
Loans and leases | 11,060,846 | 10,791,743
Interest Receivable | 74,377 | 72,620
Deposits |  |
Deposits | 13,457,148 | 13,360,797
Short-term borrowings | 862,145 | 937,814
Long-term debt | 343,236 | 344,115
Interest Payable | 48,171 | 51,454
Fair value |  |
Financial assets |  |
Cash and short-term investments | 950,697 | 1,006,019
Investment securities held-to-maturity | 70,850 | 71,688
Other investments | 11,324 | 20,554
Loans and leases | 10,759,097 | 10,468,144
Interest Receivable | 74,377 | 72,620
Deposits |  |
Deposits | 13,440,989 | 13,347,319
Short-term borrowings | 862,145 | 937,814
Long-term debt | 296,116 | 350,426
Interest Payable | 48,171 | 51,454
Fair Value, Inputs, Level 1 [Member] | Fair value |  |
Financial assets |  |
Cash and short-term investments | 950,697 | 1,006,019
Investment securities held-to-maturity | 0 | 0
Other investments | 1,284 | 1,194
Loans and leases | 0 | 0
Interest Receivable | 0 | 0
Deposits |  |
Deposits | 0 | 0
Short-term borrowings | 862,145 | 937,814
Long-term debt | 0 | 0
Interest Payable | 4,283 | 15,494
Fair Value, Inputs, Level 2 [Member] | Fair value |  |
Financial assets |  |
Cash and short-term investments | 0 | 0
Investment securities held-to-maturity | 70,850 | 71,688
Other investments | 10,040 | 10,040
Loans and leases | 0 | 0
Interest Receivable | 14,247 | 15,697
Deposits |  |
Deposits | 13,440,989 | 13,347,319
Short-term borrowings | 0 | 0
Long-term debt | 296,116 | 350,426
Interest Payable | 43,888 | 35,960
Fair Value, Inputs, Level 3 [Member] | Fair value |  |
Financial assets |  |
Cash and short-term investments | 0 | 0
Investment securities held-to-maturity | 0 | 0
Other investments | 0 | 9,320
Loans and leases | 10,759,097 | 10,468,144
Interest Receivable |  | 56,923
Deposits |  |
Deposits | 0 | 0
Short-term borrowings | 0 | 0
Long-term debt | 0 | 0
Interest Payable | $ 0 | $ 0

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References No definition available. + Details
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- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7A -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7A + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + Details
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- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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