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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, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Financial assets |  |  |
Investment securities held-to-maturity |  | $ 77,985 | $ 80,321
Other investments (1) |  | 120,318 | 129,945
Interest Receivable |  | 57,977 | 56,900
Deposits |  |  |
Noninterest-bearing |  | 3,107,699 | 3,317,960
Savings |  | 4,710,223 | 4,331,228
Time |  | 3,244,861 | 2,718,390
Federal Home Loan Bank Stock and Federal Reserve Bank Stock |  | $ 108,800 | 109,400
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | 11.50% | 11.51% |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | 5.92% | 6.16% |
Impaired Commercial And Commercial Real Estate Loans Member |  |  |
Deposits |  |  |
Principal Amount of Commercial and Commercial Real Estate Loans |  | $ 26,700 | 19,700
Allowance for Loan and Lease Losses, Real Estate |  | 8,100 | 4,400
Carrying value |  |  |
Financial assets |  |  |
Cash and short-term investments |  | 851,194 | 1,006,019
Investment securities held-to-maturity |  | 77,985 | 80,321
Other investments (1) |  | 11,487 | 20,554
Loans and leases |  | 11,394,241 | 10,791,743
Interest Receivable |  | 72,147 | 72,620
Deposits |  |  |
Deposits |  | 13,947,754 | 13,360,797
Short-term borrowings |  | 811,653 | 937,814
Long-term debt |  | 344,086 | 344,115
Interest Payable |  | 52,350 | 51,454
Fair value |  |  |
Financial assets |  |  |
Cash and short-term investments |  | 851,194 | 1,006,019
Investment securities held-to-maturity |  | 71,126 | 71,688
Other investments (1) |  | 11,487 | 20,554
Loans and leases |  | 11,348,797 | 10,468,144
Interest Receivable |  | 72,147 | 72,620
Deposits |  |  |
Deposits |  | 13,945,883 | 13,347,319
Short-term borrowings |  | 811,653 | 937,814
Long-term debt |  | 343,609 | 350,426
Interest Payable |  | 52,350 | 51,454
Fair Value, Inputs, Level 1 [Member] | Fair value |  |  |
Financial assets |  |  |
Cash and short-term investments |  | 851,194 | 1,006,019
Investment securities held-to-maturity |  | 0 | 0
Other investments (1) |  | 1,447 | 1,194
Loans and leases |  | 0 | 0
Interest Receivable |  | 0 | 0
Deposits |  |  |
Deposits |  | 0 | 0
Short-term borrowings |  | 811,653 | 937,814
Long-term debt |  | 0 | 0
Interest Payable |  | 8,936 | 15,494
Fair Value, Inputs, Level 2 [Member] | Fair value |  |  |
Financial assets |  |  |
Cash and short-term investments |  | 0 | 0
Investment securities held-to-maturity |  | 71,126 | 71,688
Other investments (1) |  | 10,040 | 10,040
Loans and leases |  | 0 | 0
Interest Receivable |  | 14,170 | 15,697
Deposits |  |  |
Deposits |  | 13,945,883 | 13,347,319
Short-term borrowings |  | 0 | 0
Long-term debt |  | 343,609 | 350,426
Interest Payable |  | 43,414 | 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 (1) |  | 0 | 9,320
Loans and leases |  | 11,348,797 | 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 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 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: 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 3: 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 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/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 + 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 -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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