Note 5 - Purchased Credit Deteriorated Loans - Classification of Purchased Credit Deteriorated Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2023
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 1,721,812	$ 1,723,471	$ 1,401,278
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	118,611	120,541
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,112,132	1,105,644
Residential Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	457,099	$ 460,604
Financial Asset Acquired with Credit Deterioration [Member] | Eagle Financial Bancorp, Inc. [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,773
Financial Asset Acquired with Credit Deterioration [Member] | Eagle Financial Bancorp, Inc. [Member] | Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	176
Financial Asset Acquired with Credit Deterioration [Member] | Eagle Financial Bancorp, Inc. [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	365
Financial Asset Acquired with Credit Deterioration [Member] | Eagle Financial Bancorp, Inc. [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 2,232