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BUSINESS COMBINATION - Shares and Ownership (Details)	Sep. 02, 2025 USD ($) $ / shares shares
Mechanics Bank Acquisition
Business Combination [Line Items]
Share issued (in shares)	221,179,736
Share ownership ratio (as a percent)	9,000
Business combination, price per share (in dollars per share) | $ / shares	$ 13.87
Purchase price consideration | $	$ 265,803,348
Mechanics Bank Acquisition | Mechanics Bancorp
Business Combination [Line Items]
Voting equity interest after merger	100.00%
Mechanics Bank Acquisition | Voting Common Stock
Business Combination [Line Items]
Business combination, fixed exchange ratio	3,301.092
Mechanics Bank Acquisition | Nonvoting Common Stock
Business Combination [Line Items]
Business combination, fixed exchange ratio	330.1092
Mechanics Bank Acquisition | Common Class B
Business Combination [Line Items]
Business combination, fixed exchange ratio	330.1092
Legacy Homestreet, Inc. Shareholders | Mechanics Bancorp
Business Combination [Line Items]
Voting equity interest after merger	8.66%
Legacy Homestreet, Inc. Shareholders | Mechanics Bank Acquisition
Business Combination [Line Items]
Share issued (in shares)	19,163,904
Legacy Homestreet, Inc. Shareholders | Mechanics Bank Acquisition | Voting Common Stock
Business Combination [Line Items]
Share issued (in shares)	18,920,808
Legacy Homestreet, Inc. Shareholders | Mechanics Bank Acquisition | Voting Common Stock | Performance Shares
Business Combination [Line Items]
Share issued (in shares)	243,096
Legacy Mechanics Bank Shareholders | Mechanics Bancorp
Business Combination [Line Items]
Voting equity interest after merger	91.34%
Legacy Mechanics Bank Shareholders | Mechanics Bank Acquisition
Business Combination [Line Items]
Share issued (in shares)	60,859
Legacy Mechanics Bank Shareholders | Mechanics Bank Acquisition | Voting Common Stock
Business Combination [Line Items]
Share issued (in shares)	60,859
Legacy Mechanics Bank Shareholders | Mechanics Bank Acquisition | Voting Common Stock | Performance Shares
Business Combination [Line Items]
Share issued (in shares)	0
Legacy Mechanics Bank Shareholders | Mechanics Bank Acquisition | Nonvoting Common Stock
Business Combination [Line Items]
Share issued (in shares)	3,376
Legacy Mechanics Bank Shareholders | Mechanics Bank Acquisition | Common Stock
Business Combination [Line Items]
Share issued (in shares)	202,015,832

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