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Note 7 - Regulatory Capital - Actual and Required Capital Amount and Ratio (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Consolidated Waterstone Financial Inc [Member]    
Total capital (to risk-weighted assets) $ 376,646 $ 376,624
Total capital (to risk-weighted assets) Ratio 0.2046 0.209
Total capital (to risk-weighted assets), For Capital Adequacy Ratio 0.08 0.08
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio 10.50% 10.50%
Tier I capital (to risk-weighted assets) $ 357,971 $ 357,135
Tier I capital (to risk-weighted assets) Ratio 0.1945 0.1981
Tier I capital (to risk-weighted assets), For Capital Adequacy Ratio 0.06 0.06
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio 8.50% 8.50%
Common Equity Tier 1 Capital (to risk-weighted assets) $ 357,971 $ 357,135
Common Equity Tier 1 capital (to risk-weighted assets) Ratio 0.1945 0.1981
Common Equity Tier I capital (to risk-weighted), For Capital Adequacy Ratio 0.045 0.045
Common Equity Tier I capital (to risk weighted), Minimum Capital Adequacy with Capital Buffer Ratio 7.00% 7.00%
Tier I capital (to average assets) $ 357,971 $ 357,135
Tier I capital (to average assets) Ratio 0.1945 0.1604
Tier I capital (to average assets), For Capital Adequacy Ratio 0.04 0.04
Total capital (to risk-weighted assets), For Capital Adequacy Purposes   $ 144,162
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer   189,213
Tier I capital (to risk-weighted assets), For Capital Adequacy Purposes   108,168
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer   153,238
Common Equity Tier I capital (to risk weighted assets), For Capital Adequacy Purposes   81,126
Common Equity Tier I capital (to risk weighted assets) Minimum Capital Adequacy with Capital Buffer   126,196
Tier I capital (to average assets), For Capital Adequacy Purposes   89,061
Subsidiaries [Member]    
Total capital (to risk-weighted assets) $ 364,300 $ 365,634
Total capital (to risk-weighted assets) Ratio 0.1979 0.2029
Total capital (to risk-weighted assets), For Capital Adequacy Ratio 0.08 0.08
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio 10.50% 10.50%
Total capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 0.10 0.10
Tier I capital (to risk-weighted assets) $ 345,625 $ 346,145
Tier I capital (to risk-weighted assets) Ratio 0.1878 0.1921
Tier I capital (to risk-weighted assets), For Capital Adequacy Ratio 0.06 0.06
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio 8.50% 8.50%
Tier I capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 0.08 0.08
Common Equity Tier 1 Capital (to risk-weighted assets) $ 345,625 $ 346,145
Common Equity Tier 1 capital (to risk-weighted assets) Ratio 0.1878 0.1921
Common Equity Tier I capital (to risk-weighted), For Capital Adequacy Ratio 0.045 0.045
Common Equity Tier I capital (to risk weighted), Minimum Capital Adequacy with Capital Buffer Ratio 7.00% 7.00%
Common Equity Tier I capital (to risk-weighted) , To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 0.065 0.065
Tier I capital (to average assets) $ 345,625 $ 346,145
Tier I capital (to average assets) Ratio 0.1878 0.1555
Tier I capital (to average assets), For Capital Adequacy Ratio 0.04 0.04
Tier I capital (to average assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio 0.05 0.05
State of Wisconsin (to total assets) $ 345,625 $ 346,145
State of Wisconsin (to total assets) Ratio 15.24% 15.68%
State of Wisconsin (to total assets), For Capital Adequacy Ratio 6.00% 6.00%
Total capital (to risk-weighted assets), For Capital Adequacy Purposes   $ 144,167
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer   189,220
Total capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions   180,209
Tier I capital (to risk-weighted assets), For Capital Adequacy Purposes   108,126
Tier I capital (to risk weighted assets), Minimum Capital Adequacy with Capital Buffer   153,178
Tier I capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions   144,168
Common Equity Tier I capital (to risk weighted assets), For Capital Adequacy Purposes   81,094
Common Equity Tier I capital (to risk weighted assets) Minimum Capital Adequacy with Capital Buffer   126,147
Common Equity Tier I capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions   117,136
Tier I capital (to average assets), For Capital Adequacy Purposes   89,041
Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.   111,301
State of Wisconsin (to total assets), For Capital Adequacy Purposes   $ 132,453