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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands		3 Months Ended	6 Months Ended
	Sep. 02, 2025 USD ($)	Jun. 30, 2026 USD ($) branch	Jun. 30, 2026 USD ($) branch	May 01, 2026 USD ($)
Business Combination [Line Items]
Number of banking branches \| branch		166	166
Purchased seasoned loan, allowance for credit losses	$ 20,300
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Fannie Mae Delegated Underwriting and Servicing
Business Combination [Line Items]
Aggregate cash consideration				$ 125,800
Gain on disposal		$ 911	$ 911
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Fannie Mae Delegated Underwriting and Servicing \| Multifamily
Business Combination [Line Items]
Approximate amount of the DUS portfolio				25,300
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Fannie Mae Delegated Underwriting and Servicing \| DUS License
Business Combination [Line Items]
Sale of DUS business line				100,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Unpaid Principal Balance, Serviced By Fannie Mae \| Multifamily
Business Combination [Line Items]
Approximate amount of the DUS portfolio				$ 1,700,000
Mechanics Bancorp \| Legacy Mechanics Bank Shareholders
Business Combination [Line Items]
Economic equity interest after merger	91.70%
Voting equity interest after merger	91.30%
Mechanics Bancorp \| Legacy Homestreet, Inc. Shareholders
Business Combination [Line Items]
Economic equity interest after merger	8.30%
Voting equity interest after merger	8.70%