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v3.26.1

Note 3 - Loans and Allowance for Credit Losses on Loans (Details Textual) Pure in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2025 USD ($)
Financing Receivable, Accrued Interest, after Allowance for Credit Loss |  | $ 25,000 |  | $ 25,000
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | [1] | 7,226,429 |  | 7,041,310
Financing Receivable, Nonaccrual, Interest Income |  | 0 | $ 0 |
Mortgage Loans in Process of Foreclosure, Amount |  | $ 2,000 |  | 1,000
Financing Receivable, Modifications, Number of Contracts |  |  | 0 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  | 0 | 0 |
Related Party [Member] |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | $ 96,000 |  | 104,000
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | $ 3,860,000 |  | $ 3,780,000
[1] | Total loans are presented inclusive of premiums, discounts and net loan origination fees and costs.

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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of accrued interest on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3A + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 35 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-35 + Details
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