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Note 7 - Regulatory Capital (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

		June 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.		$	374,893				20.83	%		$	143,980				8.00	%		$	188,980				10.50	%			N/A				N/A
Waterstone Bank			360,341				19.97	%			144,350				8.00	%			189,460				10.50	%			180,441				10.00	%
Tier I Capital (to risk-weighted assets)
Consolidated Waterstone Financial, Inc.			355,948				19.78	%			107,970				6.00	%			152,960				8.50	%			N/A				N/A
Waterstone Bank			341,396				18.92	%			108,270				6.00	%			153,380				8.50	%			144,353				8.00	%
Common Equity Tier 1 Capital (to risk-weighted assets)
Consolidated Waterstone Financial, Inc.			355,948				19.78	%			80,980				4.50	%			125,970				7.00	%			N/A				N/A
Waterstone Bank			341,396				18.92	%			81,200				4.50	%			126,310				7.00	%			117,287				6.50	%
Tier I Capital (to average assets)
Consolidated Waterstone Financial, Inc.			355,948				19.78	%			71,980				4.00	%			N/A				N/A				N/A				N/A
Waterstone Bank			341,396				15.35	%			88,960				4.00	%			N/A				N/A				111,204				5.00	%
State of Wisconsin (to total assets)
Waterstone Bank			341,396				15.13	%			135,390				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

+ Details

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Data Type:	dtr-types:textBlockItemType
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