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Note 6 - Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  |  |  |  |  | Quoted Prices |  |  |  |  |  |  |  |  |
|  |  |  |  |  | in Active |  |  | Significant |  |  |  |  |
|  |  |  |  |  | Markets for |  |  | Other |  |  | Significant |
|  |  |  |  |  | Identical |  |  | Observable |  |  | Unobservable |
|  | Carrying |  |  | Assets |  |  | Inputs |  |  | Inputs |
|  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
As of September 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 2,929,179 |  |  | $ | — |  |  | $ | 2,929,179 |  |  | $ | — |
Corporate bonds |  |  | 46,330,900 |  |  |  | — |  |  |  | 46,330,900 |  |  |  | — |
Municipal obligations |  |  | 424,280 |  |  |  | — |  |  |  | 424,280 |  |  |  | — |
MBS - residential |  |  | 99,331,011 |  |  |  | — |  |  |  | 99,331,011 |  |  |  | — |
MBS - commercial |  |  | 11,731,869 |  |  |  | — |  |  |  | 11,731,869 |  |  |  | — |
Fair value hedge |  |  | 51,606 |  |  |  | — |  |  |  | 51,606 |  |  |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedge |  |  | 187,703 |  |  |  | — |  |  |  | 187,703 |  |  |  | — |
Fair value hedge |  |  | 51,606 |  |  |  | — |  |  |  | 51,606 |  |  |  | — |
|  | $ | 160,559,536 |  |  | $ | — |  |  | $ | 160,559,536 |  |  | $ | — |
As of December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 12,792,540 |  |  | $ | — |  |  | $ | 12,792,540 |  |  | $ | — |
Corporate bonds |  |  | 38,229,775 |  |  |  | — |  |  |  | 38,229,775 |  |  |  | — |
Municipal obligations |  |  | 398,275 |  |  |  | — |  |  |  | 398,275 |  |  |  | — |
MBS - residential |  |  | 74,552,809 |  |  |  | — |  |  |  | 74,552,809 |  |  |  | — |
MBS - commercial |  |  | 14,334,048 |  |  |  | — |  |  |  | 14,334,048 |  |  |  | — |
Cash flow hedge |  |  | 651,340 |  |  |  | — |  |  |  | 651,340 |  |  |  | — |
Fair value hedge |  |  | 109,594 |  |  |  | — |  |  |  | 109,594 |  |  |  | — |
|  | $ | 141,068,381 |  |  | $ | — |  |  | $ | 141,068,381 |  |  | $ | — |
Fair Value Measurements, Nonrecurring [Table Text Block] |
|  | Carrying |  |  | Fair |  |  | Fair Value Measurement Placement |
|  | Amount |  |  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
|  | (In thousands) |
September 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments - assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans |  | $ | 671,772 |  |  | $ | 648,287 |  |  | $ | — |  |  | $ | — |  |  | $ | 648,287 |
Financial instruments - liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 502,537 |  |  |  | 503,120 |  |  |  | — |  |  |  | 503,120 |  |  |  | — |
Borrowings |  |  | 119,413 |  |  |  | 120,045 |  |  |  | — |  |  |  | 120,045 |  |  |  | — |
|  | Carrying |  |  | Fair |  |  | Fair Value Measurement Placement |
|  | Amount |  |  | Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
|  | (In thousands) |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments - assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans |  | $ | 714,337 |  |  | $ | 686,977 |  |  | $ | — |  |  | $ | — |  |  | $ | 686,977 |
Financial instruments - liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 493,280 |  |  |  | 493,769 |  |  |  | — |  |  |  | 493,769 |  |  |  | — |
Borrowings |  |  | 172,173 |  |  |  | 172,575 |  |  |  | — |  |  |  | 172,575 |  |  |  | — |

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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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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 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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