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FAIR VALUE MEASUREMENTS - Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial assets |  |
Debt securities held to maturity | $ 730,397 | $ 785,295
Portfolio loans, net | 7,559,294 | 7,634,094
Mortgage servicing rights | 1,500,000 | 1,700,000
Financial liabilities |  |
Short-term borrowings | 12,000 | 351,054
Junior subordinated debt owed to unconsolidated trusts | 71,993 | 71,810
Level 1 Inputs | Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 719,581 | 227,164
Level 1 Inputs | Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 719,581 | 227,164
Level 2 Inputs | Carrying Amount |  |
Financial assets |  |
Debt securities held to maturity | 872,628 | 918,312
Loans held for sale | 2,379 | 1,253
Accrued interest receivable | 45,288 | 43,372
Financial liabilities |  |
Time deposits | 1,819,274 | 855,375
Securities sold under agreements to repurchase | 187,396 | 229,806
Short-term borrowings | 12,000 | 351,054
Long-term debt | 18,000 | 30,000
Junior subordinated debt owed to unconsolidated trusts | 71,993 | 71,810
Accrued interest payable | 28,418 | 3,978
Level 2 Inputs | Fair Value |  |
Financial assets |  |
Debt securities held to maturity | 730,397 | 785,295
Loans held for sale | 2,401 | 1,276
Accrued interest receivable | 45,288 | 43,372
Financial liabilities |  |
Time deposits | 1,804,905 | 830,596
Securities sold under agreements to repurchase | 187,396 | 229,806
Short-term borrowings | 12,034 | 351,085
Long-term debt | 18,020 | 30,052
Junior subordinated debt owed to unconsolidated trusts | 57,153 | 59,111
Accrued interest payable | 28,418 | 3,978
Level 3 Inputs | Carrying Amount |  |
Financial assets |  |
Portfolio loans, net | 7,559,294 | 7,634,094
Mortgage servicing rights | 3,289 | 5,861
Other servicing rights | 1,597 | 1,914
Level 3 Inputs | Fair Value |  |
Financial assets |  |
Portfolio loans, net | 7,276,905 | 7,320,422
Mortgage servicing rights | 18,079 | 18,284
Other servicing rights | 2,062 | 2,331
Level 3 Inputs | Subordinated Debt | Carrying Amount |  |
Financial liabilities |  |
Long-term debt | 222,882 | 222,038
Level 3 Inputs | Subordinated Debt | Fair Value |  |
Financial liabilities |  |
Long-term debt | $ 200,000 | $ 208,562

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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 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://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//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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