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REGULATORY CAPITAL REQUIREMENTS - Schedule of Capital and Capital Ratios (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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HomeStreet Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 leverage capital (to average assets) | $ 678,869 | $ 814,719
Tier 1 leverage capital (to average assets), ratio | 0.0730 | 0.0850
Tier 1 leverage capital (to average assets), required for capital adequacy purposes | $ 372,132 | $ 383,482
Tier 1 leverage capital (to average assets), required for capital adequacy purposes, ratio | 0.040 | 0.040
Tier 1 leverage capital (to average assets), required to be categorized as well capitalized | $ 465,165 | $ 479,352
Tier 1 leverage capital (to average assets), required to be categorized as well capitalized, ratio | 0.050 | 0.050
Common equity tier 1 capital (to risk-weighted assets) | $ 678,869 | $ 814,719
Common equity tier 1 capital (to risk-weighted assets), ratio | 0.1227 | 0.1279
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy | $ 249,000 | $ 286,569
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy, ratio | 0.045 | 0.045
Common equity tier 1 capital (to risk-weighted assets), required to be well capitalized | $ 359,667 | $ 413,933
Common equity tier 1 capital (to risk-weighted assets), required to be well capitalized, ratio | 0.065 | 0.065
Tier 1 risk-based capital (to risk-weighted assets) | $ 678,869 | $ 814,719
Tier 1 risk-based capital (to risk-weighted assets), ratio | 0.1227 | 0.1279
Tier 1 risk-based capital (to risk-weighted assets), required for capital adequacy | $ 332,001 | $ 382,092
Tier 1 risk-based capital (to risk-weighted assets), required for capital adequacy, ratio | 0.060 | 0.060
Tier 1 risk-based capital (to risk-weighted assets), required to be well capitalized | $ 442,667 | $ 509,456
Tier 1 risk-based capital (to risk-weighted assets), required to be well capitalized, ratio | 0.080 | 0.080
Total risk-based capital (to risk-weighted assets) | $ 720,498 | $ 858,992
Total risk-based capital (to risk-weighted assets), ratio | 0.1302 | 0.1349
Total risk-based capital (to risk-weighted assets), required for capital adequacy | $ 442,667 | $ 509,456
Total risk-based capital (to risk-weighted assets), required for capital adequacy, ratio | 0.080 | 0.080
Total risk-based capital (to risk-weighted assets), required to be well capitalized | $ 553,334 | $ 636,820
Total risk-based capital (to risk-weighted assets), required to be well capitalized, ratio | 0.100 | 0.100
HomeStreet, Inc. |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 leverage capital (to average assets) | $ 537,057 | $ 675,440
Tier 1 leverage capital (to average assets), ratio | 0.0577 | 0.0704
Tier 1 leverage capital (to average assets), required for capital adequacy purposes | $ 372,319 | $ 383,696
Tier 1 leverage capital (to average assets), required for capital adequacy purposes, ratio | 0.040 | 0.040
Common equity tier 1 capital (to risk-weighted assets) | $ 477,057 | $ 615,440
Common equity tier 1 capital (to risk-weighted assets), ratio | 0.0862 | 0.0966
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy | $ 249,109 | $ 286,709
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy, ratio | 0.045 | 0.045
Tier 1 risk-based capital (to risk-weighted assets) | $ 537,057 | $ 675,440
Tier 1 risk-based capital (to risk-weighted assets), ratio | 0.0970 | 0.1060
Tier 1 risk-based capital (to risk-weighted assets), required for capital adequacy | $ 332,145 | $ 382,279
Tier 1 risk-based capital (to risk-weighted assets), required for capital adequacy, ratio | 0.060 | 0.060
Total risk-based capital (to risk-weighted assets) | $ 677,225 | $ 818,075
Total risk-based capital (to risk-weighted assets), ratio | 0.1223 | 0.1284
Total risk-based capital (to risk-weighted assets), required for capital adequacy | $ 442,860 | $ 509,705
Total risk-based capital (to risk-weighted assets), required for capital adequacy, ratio | 0.080 | 0.080

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