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Note 7 - Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | September 30, 2025 |
|  | Actual |  |  | For Capital Adequacy Purposes |  |  | Minimum Capital Adequacy with Capital Buffer |  |  | To Be Well-Capitalized Under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
|  | (Dollars In Thousands) |
Total Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Waterstone Financial, Inc. |  | $ | 376,646 |  |  |  | 20.46 | % |  | $ | 147,260 |  |  |  | 8.00 | % |  | $ | 193,280 |  |  |  | 10.50 | % |  |  | N/A |  |  |  | N/A |
Waterstone Bank |  |  | 364,300 |  |  |  | 19.79 | % |  |  | 147,260 |  |  |  | 8.00 | % |  |  | 193,290 |  |  |  | 10.50 | % |  |  | 184,081 |  |  |  | 10.00 | %
Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Waterstone Financial, Inc. |  |  | 357,971 |  |  |  | 19.45 | % |  |  | 110,450 |  |  |  | 6.00 | % |  |  | 156,470 |  |  |  | 8.50 | % |  |  | N/A |  |  |  | N/A |
Waterstone Bank |  |  | 345,625 |  |  |  | 18.78 | % |  |  | 110,450 |  |  |  | 6.00 | % |  |  | 156,470 |  |  |  | 8.50 | % |  |  | 147,265 |  |  |  | 8.00 | %
Common Equity Tier 1 Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Waterstone Financial, Inc. |  |  | 357,971 |  |  |  | 19.45 | % |  |  | 82,840 |  |  |  | 4.50 | % |  |  | 128,860 |  |  |  | 7.00 | % |  |  | N/A |  |  |  | N/A |
Waterstone Bank |  |  | 345,625 |  |  |  | 18.78 | % |  |  | 82,840 |  |  |  | 4.50 | % |  |  | 128,860 |  |  |  | 7.00 | % |  |  | 119,653 |  |  |  | 6.50 | %
Tier I Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Waterstone Financial, Inc. |  |  | 357,971 |  |  |  | 19.45 | % |  |  | 73,630 |  |  |  | 4.00 | % |  |  | N/A |  |  |  | N/A |  |  |  | N/A |  |  |  | N/A |
Waterstone Bank |  |  | 345,625 |  |  |  | 18.78 | % |  |  | 73,630 |  |  |  | 4.00 | % |  |  | N/A |  |  |  | N/A |  |  |  | 92,041 |  |  |  | 5.00 | %
State of Wisconsin (to total assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waterstone Bank |  |  | 345,625 |  |  |  | 15.24 | % |  |  | 136,110 |  |  |  | 6.00 | % |  |  | N/A |  |  |  | N/A |  |  |  | N/A |  |  |  | N/A |
|  | December 31, 2024 |
|  | Actual |  |  | For Capital Adequacy Purposes |  |  | Minimum Capital Adequacy with Capital Buffer |  |  | To Be Well-Capitalized Under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
|  | (Dollars In Thousands) |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Waterstone Financial, Inc. |  | $ | 376,624 |  |  |  | 20.90 | % |  | $ | 144,162 |  |  |  | 8.00 | % |  | $ | 189,213 |  |  |  | 10.50 | % |  |  | N/A |  |  |  | N/A |
Waterstone Bank |  |  | 365,634 |  |  |  | 20.29 | % |  |  | 144,167 |  |  |  | 8.00 | % |  |  | 189,220 |  |  |  | 10.50 | % |  |  | 180,209 |  |  |  | 10.00 | %
Tier I capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Waterstone Financial, Inc. |  |  | 357,135 |  |  |  | 19.81 | % |  |  | 108,168 |  |  |  | 6.00 | % |  |  | 153,238 |  |  |  | 8.50 | % |  |  | N/A |  |  |  | N/A |
Waterstone Bank |  |  | 346,145 |  |  |  | 19.21 | % |  |  | 108,126 |  |  |  | 6.00 | % |  |  | 153,178 |  |  |  | 8.50 | % |  |  | 144,168 |  |  |  | 8.00 | %
Common Equity Tier 1 Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Waterstone Financial, Inc. |  |  | 357,135 |  |  |  | 19.81 | % |  |  | 81,126 |  |  |  | 4.50 | % |  |  | 126,196 |  |  |  | 7.00 | % |  |  | N/A |  |  |  | N/A |
Waterstone Bank |  |  | 346,145 |  |  |  | 19.21 | % |  |  | 81,094 |  |  |  | 4.50 | % |  |  | 126,147 |  |  |  | 7.00 | % |  |  | 117,136 |  |  |  | 6.50 | %
Tier I Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Waterstone Financial, Inc. |  |  | 357,135 |  |  |  | 16.04 | % |  |  | 89,061 |  |  |  | 4.00 | % |  |  | N/A |  |  |  | N/A |  |  |  | N/A |  |  |  | N/A |
Waterstone Bank |  |  | 346,145 |  |  |  | 15.55 | % |  |  | 89,041 |  |  |  | 4.00 | % |  |  | N/A |  |  |  | N/A |  |  |  | 111,301 |  |  |  | 5.00 | %
State of Wisconsin (to total assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waterstone Bank |  |  | 346,145 |  |  |  | 15.68 | % |  |  | 132,453 |  |  |  | 6.00 | % |  |  | N/A |  |  |  | N/A |  |  |  | N/A |  |  |  | N/A |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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