Note 4 - Loans Receivable and Allowance for Credit Losses (Details Textual)	3 Months Ended	6 Months Ended
Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 2,031,361,000		$ 2,031,361,000		$ 2,035,227,000
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount)	200,000		200,000		30,000.00
Off-Balance-Sheet, Credit Loss, Liability	762,300		762,300		829,100
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability	262,000,000		262,000,000		189,800,000
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	0	$ 306,000	66,800	$ 439,000
Real Estate Portfolio Segment [Member] \| Mortgage on Residential Properties Occupied by One to Four Families [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	427,955,000		$ 427,955,000		$ 451,463,000
Number of Mortgage Loans in Process of Foreclosure			13
Mortgage Loans in Process of Foreclosure, Amount	$ 3,300,000		$ 3,300,000

Represents the number of mortgage loans in the process of foreclosure during the period.

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- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
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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
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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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
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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
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- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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