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Note 7 - Regulatory Capital (Tables)

9 Months Ended

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

X

- 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

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Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_TableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration