v3.26.1
Note 7 - Regulatory Capital - Actual and Required Capital Amount and Ratio (Details)
$ in Thousands
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Consolidated Waterstone Financial Inc [Member]    
Total capital (to risk-weighted assets) $ 382,410 $ 379,102
Total capital (to risk-weighted assets) Ratio 0.2073 0.2113
Total capital (to risk-weighted assets), For Capital Adequacy Purposes $ 147,550 $ 143,550
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 $ 193,660 $ 188,410
Total capital (to risk-weighted assets), Minimum Capital Adequacy with Capital Buffer Ratio 10.50% 10.50%
Tier I capital (to risk-weighted assets) $ 363,665 $ 360,884
Tier I capital (to risk-weighted assets) Ratio 0.1972 0.2011
Tier I capital (to risk-weighted assets), For Capital Adequacy Purposes $ 110,660 $ 107,662
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 $ 156,770 $ 152,522
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) $ 363,665 $ 360,884
Common Equity Tier 1 capital (to risk-weighted assets) Ratio 0.1972 0.2011
Common Equity Tier I capital (to risk weighted assets), For Capital Adequacy Purposes $ 83,000 $ 80,747
Common Equity Tier I capital (to risk-weighted), For Capital Adequacy Ratio 0.045 0.045
Common Equity Tier I capital (to risk weighted assets) Minimum Capital Adequacy with Capital Buffer $ 129,110 $ 125,606
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) $ 363,665 $ 360,884
Tier I capital (to average assets) Ratio 0.1631 0.1594
Tier I capital (to average assets), For Capital Adequacy Purposes $ 89,190 $ 90,580
Tier I capital (to average assets), For Capital Adequacy Ratio 0.04 0.04
Subsidiaries [Member]    
Total capital (to risk-weighted assets) $ 362,782 $ 367,517
Total capital (to risk-weighted assets) Ratio 0.1968 0.2049
Total capital (to risk-weighted assets), For Capital Adequacy Purposes $ 147,500 $ 143,526
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 $ 193,590 $ 188,377
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 $ 184,375 $ 179,407
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) $ 344,037 $ 349,299
Tier I capital (to risk-weighted assets) Ratio 0.1866 0.1947
Tier I capital (to risk-weighted assets), For Capital Adequacy Purposes $ 110,630 $ 107,644
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 $ 156,720 $ 152,495
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 $ 147,500 $ 143,525
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) $ 344,037 $ 349,299
Common Equity Tier 1 capital (to risk-weighted assets) Ratio 0.1866 0.1947
Common Equity Tier I capital (to risk weighted assets), For Capital Adequacy Purposes $ 82,970 $ 80,733
Common Equity Tier I capital (to risk-weighted), For Capital Adequacy Ratio 0.045 0.045
Common Equity Tier I capital (to risk weighted assets) Minimum Capital Adequacy with Capital Buffer $ 129,060 $ 125,585
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 assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions $ 119,844 $ 116,614
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) $ 344,037 $ 349,299
Tier I capital (to average assets) Ratio 0.1543 0.1543
Tier I capital (to average assets), For Capital Adequacy Purposes $ 89,190 $ 90,550
Tier I capital (to average assets), For Capital Adequacy Ratio 0.04 0.04
Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action. $ 111,488 $ 113,191
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) $ 344,037 $ 349,299
State of Wisconsin (to total assets) Ratio 15.27% 15.46%
State of Wisconsin (to total assets), For Capital Adequacy Purposes $ 135,170 $ 135,550
State of Wisconsin (to total assets), For Capital Adequacy Ratio 6.00% 6.00%