Note 3 - Loans Receivable and Allowance for Credit Losses - Loans - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Gross	$ 2,532,770	$ 2,533,821
Commercial Real Estate [Member]
Financing Receivable, Gross	7,683	7,750
Residential Real Estate [Member]
Financing Receivable, Gross	1,386	425
Other Nonreal Estate [Member]
Financing Receivable, Gross	5,401	5,412
Collateral Dependent Loans [Member]
Financing Receivable, Gross	14,470	13,587
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Gross	873,017	871,337
Commercial Real Estate Portfolio Segment [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	7,683	7,750
Commercial Real Estate Portfolio Segment [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	0	0
Commercial Real Estate Portfolio Segment [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	0	0
Commercial Real Estate Portfolio Segment [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	7,683	7,750
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied [Member]
Financing Receivable, Gross	164,911	170,396
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	1,196	2,771
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	0	0
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	0	0
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	1,196	2,771
Commercial Real Estate Portfolio Segment [Member] \| Commercial and Speculative Construction and Development [Member]
Financing Receivable, Gross	288,978	280,798
Commercial Real Estate Portfolio Segment [Member] \| Commercial and Speculative Construction and Development [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	6,487	4,979
Commercial Real Estate Portfolio Segment [Member] \| Commercial and Speculative Construction and Development [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	0	0
Commercial Real Estate Portfolio Segment [Member] \| Commercial and Speculative Construction and Development [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	0
Commercial Real Estate Portfolio Segment [Member] \| Commercial and Speculative Construction and Development [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	6,487	4,979
Residential Portfolio Segment [Member]
Financing Receivable, Gross	759,955	742,371
Residential Portfolio Segment [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	0	0
Residential Portfolio Segment [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	1,386	425
Residential Portfolio Segment [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	0	0
Residential Portfolio Segment [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	1,386	425
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member]
Financing Receivable, Gross	637,299	617,322
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	0	0
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	1,134	164
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	0	0
Residential Portfolio Segment [Member] \| One-to-four Family Loan [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	1,134	164
Residential Portfolio Segment [Member] \| Home Equity Loan [Member]
Financing Receivable, Gross	73,846	75,147
Residential Portfolio Segment [Member] \| Home Equity Loan [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	0	0
Residential Portfolio Segment [Member] \| Home Equity Loan [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	252	261
Residential Portfolio Segment [Member] \| Home Equity Loan [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	0	0
Residential Portfolio Segment [Member] \| Home Equity Loan [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	252	261
Consumer Portfolio Segment [Member]
Financing Receivable, Gross	608,893	620,181
Consumer Portfolio Segment [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	0	0
Consumer Portfolio Segment [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	0	0
Consumer Portfolio Segment [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	3,469	1,966
Consumer Portfolio Segment [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	3,469	1,966
Consumer Portfolio Segment [Member] \| Indirect Home Improvement Loan [Member]
Financing Receivable, Gross	532,038	541,946
Consumer Portfolio Segment [Member] \| Indirect Home Improvement Loan [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	0	0
Consumer Portfolio Segment [Member] \| Indirect Home Improvement Loan [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	0	0
Consumer Portfolio Segment [Member] \| Indirect Home Improvement Loan [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	2,821	1,677
Consumer Portfolio Segment [Member] \| Indirect Home Improvement Loan [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	2,821	1,677
Consumer Portfolio Segment [Member] \| Marine Loans [Member]
Financing Receivable, Gross	73,737	74,931
Consumer Portfolio Segment [Member] \| Marine Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	0	0
Consumer Portfolio Segment [Member] \| Marine Loans [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	0	0
Consumer Portfolio Segment [Member] \| Marine Loans [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	648	289
Consumer Portfolio Segment [Member] \| Marine Loans [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	648	289
Commercial Business Portfolio Segment [Member]
Financing Receivable, Gross	290,905	299,932
Commercial Business Portfolio Segment [Member] \| Commercial And Industrial [Member]
Financing Receivable, Gross	274,956	287,014
Commercial Business Portfolio Segment [Member] \| Commercial And Industrial [Member] \| Commercial Real Estate [Member]
Financing Receivable, Gross	0	0
Commercial Business Portfolio Segment [Member] \| Commercial And Industrial [Member] \| Residential Real Estate [Member]
Financing Receivable, Gross	0	0
Commercial Business Portfolio Segment [Member] \| Commercial And Industrial [Member] \| Other Nonreal Estate [Member]
Financing Receivable, Gross	1,932	3,446
Commercial Business Portfolio Segment [Member] \| Commercial And Industrial [Member] \| Collateral Dependent Loans [Member]
Financing Receivable, Gross	$ 1,932	$ 3,446

Note 3 - Loans Receivable and Allowance for Credit Losses - Loans - Schedule of Collateral Dependent Loans (Details) - USD ($)
$ in Thousands

Mar. 31, 2025

Dec. 31, 2024

Financing Receivable, Gross

$ 2,532,770

$ 2,533,821

Commercial Real Estate [Member]

Financing Receivable, Gross

7,683

7,750

Residential Real Estate [Member]

Financing Receivable, Gross