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Note 12 - Fair Value Measurement (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value Measurements at June 30, 2025 Using |  |  |  |  |
|  | Quoted Prices in |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Active Markets |  |  | Significant Other |  |  | Significant |  |  |  |  |
|  | for Identical |  |  | Observable Inputs |  |  | Unobservable |  |  |  |  |
|  | Assets (Level 1) |  |  | (Level 2) |  |  | Inputs (Level 3) |  |  | Total |
Assets Measured on a Recurring Basis: |  | (In Thousands) |
Available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 701,482 |  |  | $ | - |  |  | $ | - |  |  | $ | 701,482 |
Mortgage-backed securities |  |  | - |  |  |  | 178,151 |  |  |  | - |  |  |  | 178,151 |
State and municipal securities |  |  | - |  |  |  | 9,639 |  |  |  | - |  |  |  | 9,639 |
Corporate debt |  |  | - |  |  |  | 338,579 |  |  |  | - |  |  |  | 338,579 |
Total available-for-sale debt securities |  |  | 701,482 |  |  |  | 526,369 |  |  |  | - |  |  |  | 1,227,851 |
Total assets at fair value |  | $ | 701,482 |  |  | $ | 526,369 |  |  | $ | - |  |  | $ | 1,227,851 |
|  | Fair Value Measurements at December 31, 2024 Using |  |  |  |  |
|  | Quoted Prices in |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Active Markets |  |  | Significant Other |  |  | Significant |  |  |  |  |
|  | for Identical |  |  | Observable Inputs |  |  | Unobservable |  |  |  |  |
|  | Assets (Level 1) |  |  | (Level 2) |  |  | Inputs (Level 3) |  |  | Total |
Assets Measured on a Recurring Basis: |  | (In Thousands) |
Available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 617,486 |  |  | $ | - |  |  | $ | - |  |  | $ | 617,486 |
Government agency securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Mortgage-backed securities |  |  | - |  |  |  | 219,274 |  |  |  | - |  |  |  | 219,274 |
State and municipal securities |  |  | - |  |  |  | 9,517 |  |  |  | - |  |  |  | 9,517 |
Corporate debt |  |  | - |  |  |  | 315,123 |  |  |  | - |  |  |  | 315,123 |
Total available-for-sale debt securities |  |  | 617,486 |  |  |  | 543,914 |  |  |  | - |  |  |  | 1,161,400 |
Total assets at fair value |  | $ | 617,486 |  |  | $ | 543,914 |  |  | $ | - |  |  | $ | 1,161,400 |
Fair Value Measurements, Nonrecurring [Table Text Block] |
|  | Fair Value Measurements at June 30, 2025 |  |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
Assets Measured on a Nonrecurring Basis: |  | (In Thousands) |
Loans individually evaluated |  | $ | - |  |  | $ | - |  |  | $ | 94,792 |  |  | $ | 94,792 |
Other real estate owned and repossessed assets |  |  | - |  |  |  | - |  |  |  | 311 |  |  |  | 311 |
Total assets at fair value |  | $ | - |  |  | $ | - |  |  | $ | 95,103 |  |  | $ | 95,103 |
|  | Fair Value Measurements at December 31, 2024 |  |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
Assets Measured on a Nonrecurring Basis: |  | (In Thousands) |
Loans individually evaluated |  | $ | - |  |  | $ | - |  |  | $ | 95,667 |  |  | $ | 95,667 |
Other real estate owned and repossessed assets |  |  | - |  |  |  | - |  |  |  | 2,531 |  |  |  | 2,531 |
Total assets at fair value |  | $ | - |  |  | $ | - |  |  | $ | 98,198 |  |  | $ | 98,198 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
|  | For the Three Months Ended June 30, |  |  | For the Six Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | Available-for-sale Securities |  |  | Available-for-sale Securities |  |  | Available-for-sale Securities |  |  | Available-for-sale Securities |
|  | (In Thousands) |
Fair value, beginning of period |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 6,860 |
Transfers into Level 3 |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total realized gains included in income |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (1,329 | )
Purchases |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Transfers out of Level 3 |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (5,531 | )
Fair value, end of period |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
June 30, 2025 |  | Carrying / Notional Amount |  |  | Estimated Fair Value |  |  | Quoted Market Prices in an Active Market (Level 1) |  |  | Models with Significant Observable Market Parameters (Level 2) |  |  | Models with Significant Unobservable Market Parameters (Level 3) |
|  | (In Thousands) |
Financial Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 1,704,904 |  |  | $ | 1,704,904 |  |  | $ | 1,704,904 |  |  | $ | - |  |  | $ | - |
Held to maturity U.S. Treasury securities |  |  | 249,511 |  |  |  | 236,162 |  |  |  | 236,162 |  |  |  | - |  |  |  | - |
Federal funds sold |  |  | 6,000 |  |  |  | 6,000 |  |  |  | - |  |  |  | 6,000 |  |  |  | - |
Held to maturity debt securities |  |  | 436,641 |  |  |  | 393,443 |  |  |  | - |  |  |  | 393,443 |  |  |  | - |
Mortgage loans held for sale |  |  | 22,131 |  |  |  | 22,131 |  |  |  | - |  |  |  | 22,131 |  |  |  | - |
Restricted equity securities |  |  | 12,156 |  |  |  | 12,156 |  |  |  | - |  |  |  | 12,156 |  |  |  | - |
Held to maturity debt securities |  |  | 500 |  |  |  | 500 |  |  |  | - |  |  |  | - |  |  |  | 500 |
Loans, net |  |  | 13,062,601 |  |  |  | 12,776,566 |  |  |  | - |  |  |  | - |  |  |  | 12,776,566 |
Financial Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 13,862,319 |  |  | $ | 13,860,040 |  |  | $ | - |  |  | $ | 13,860,040 |  |  | $ | - |
Federal funds purchased |  |  | 1,599,135 |  |  |  | 1,599,135 |  |  |  | - |  |  |  | 1,599,135 |  |  |  | - |
Other borrowings |  |  | 64,747 |  |  |  | 59,669 |  |  |  | - |  |  |  | 59,669 |  |  |  | - |
December 31, 2024 |  | Carrying / Notional Amount |  |  | Estimated Fair Value |  |  | Quoted Market Prices in an Active Market (Level 1) |  |  | Models with Significant Observable Market Parameters (Level 2) |  |  | Models with Significant Unobservable Market Parameters (Level 3) |
|  | (In Thousands) |
Financial Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 2,375,589 |  |  | $ | 2,375,589 |  |  | $ | 2,375,589 |  |  | $ | - |  |  | $ | - |
Held to maturity U.S. Treasury securities |  |  | 249,403 |  |  |  | 229,771 |  |  |  | 229,771 |  |  |  | - |  |  |  | - |
Federal funds sold |  |  | 1,045 |  |  |  | 1,045 |  |  |  | - |  |  |  | 1,045 |  |  |  | - |
Held to maturity debt securities |  |  | 465,200 |  |  |  | 409,475 |  |  |  | - |  |  |  | 409,475 |  |  |  | - |
Mortgage loans held for sale |  |  | 9,211 |  |  |  | 9,211 |  |  |  | - |  |  |  | 9,211 |  |  |  | - |
Restricted equity securities |  |  | 11,300 |  |  |  | 11,300 |  |  |  | - |  |  |  | 11,300 |  |  |  | - |
Held to maturity debt securities |  |  | 250 |  |  |  | 250 |  |  |  | - |  |  |  | - |  |  |  | 250 |
Loans, net |  |  | 12,441,378 |  |  |  | 12,013,721 |  |  |  | - |  |  |  | - |  |  |  | 12,013,721 |
Financial Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 13,543,459 |  |  | $ | 13,540,438 |  |  | $ | - |  |  | $ | 13,540,438 |  |  | $ | - |
Federal funds purchased |  |  | 1,993,728 |  |  |  | 1,993,728 |  |  |  | - |  |  |  | 1,993,728 |  |  |  | - |
Other borrowings |  |  | 64,743 |  |  |  | 59,130 |  |  |  | - |  |  |  | 59,130 |  |  |  | - |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + 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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