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FAIR VALUE MEASUREMENTS - Schedule of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets |  |
Debt securities held to maturity | $ 712,369 | $ 730,397
Portfolio loans, net | 7,724,116 | 7,559,294
Financial liabilities |  |
Short-term borrowings | 0 | 12,000
Junior subordinated debt owed to unconsolidated trusts | 74,754 | 71,993
Level 1 Inputs | Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 553,709 | 719,581
Level 1 Inputs | Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 553,709 | 719,581
Level 2 Inputs | Carrying Amount |  |
Financial assets |  |
Debt securities held to maturity | 838,883 | 872,628
Loans held for sale | 11,523 | 2,379
Accrued interest receivable | 48,822 | 45,288
Financial liabilities |  |
Time deposits | 1,519,925 | 1,819,274
Securities sold under agreements to repurchase | 128,429 | 187,396
Short-term borrowings | 0 | 12,000
Long-term debt | 0 | 18,000
Junior subordinated debt owed to unconsolidated trusts | 74,754 | 71,993
Accrued interest payable | 33,447 | 28,418
Level 2 Inputs | Fair Value |  |
Financial assets |  |
Debt securities held to maturity | 712,369 | 730,397
Loans held for sale | 11,810 | 2,401
Accrued interest receivable | 48,822 | 45,288
Financial liabilities |  |
Time deposits | 1,511,069 | 1,804,905
Securities sold under agreements to repurchase | 128,429 | 187,396
Short-term borrowings | 0 | 12,034
Long-term debt | 0 | 18,020
Junior subordinated debt owed to unconsolidated trusts | 61,840 | 57,153
Accrued interest payable | 33,447 | 28,418
Level 3 Inputs | Carrying Amount |  |
Financial assets |  |
Portfolio loans, net | 7,724,116 | 7,559,294
Mortgage servicing rights | 1,008 | 3,289
Other servicing rights | 1,479 | 1,597
Level 3 Inputs | Fair Value |  |
Financial assets |  |
Portfolio loans, net | 7,597,736 | 7,276,905
Mortgage servicing rights | 4,963 | 18,079
Other servicing rights | 1,505 | 2,062
Level 3 Inputs | Subordinated Debt | Carrying Amount |  |
Financial liabilities |  |
Long-term debt | 227,482 | 222,882
Level 3 Inputs | Subordinated Debt | Fair Value |  |
Financial liabilities |  |
Long-term debt | $ 216,713 | $ 200,000

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease. + 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 + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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