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REGULATORY CAPITAL REQUIREMENTS - Schedule of Capital and Capital Ratios (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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HomeStreet Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 leverage capital (to average assets) | $ 814,719 | $ 822,891
Tier 1 leverage capital (to average assets), ratio | 0.0850 | 0.0863
Tier 1 leverage capital (to average assets), required for capital adequacy purposes | $ 383,482 | $ 381,506
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 | $ 479,352 | $ 476,883
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) | $ 814,719 | $ 822,891
Common equity tier 1 capital (to risk-weighted assets), ratio | 0.1279 | 0.1192
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy | $ 286,569 | $ 310,582
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 | $ 413,933 | $ 448,618
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) | $ 814,719 | $ 822,891
Tier 1 risk-based capital (to risk-weighted assets), ratio | 0.1279 | 0.1192
Tier 1 risk-based capital (to risk-weighted assets), required for capital adequacy | $ 382,092 | $ 414,109
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 | $ 509,456 | $ 552,146
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) | $ 858,992 | $ 868,993
Total risk-based capital (to risk-weighted assets), ratio | 0.1349 | 0.1259
Total risk-based capital (to risk-weighted assets), required for capital adequacy | $ 509,456 | $ 552,146
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 | $ 636,820 | $ 690,182
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) | $ 675,440 | $ 693,112
Tier 1 leverage capital (to average assets), ratio | 0.0704 | 0.0725
Tier 1 leverage capital (to average assets), required for capital adequacy purposes | $ 383,696 | $ 382,467
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) | $ 615,440 | $ 633,112
Common equity tier 1 capital (to risk-weighted assets), ratio | 0.0966 | 0.0872
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy | $ 286,709 | $ 326,876
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) | $ 675,440 | $ 693,112
Tier 1 risk-based capital (to risk-weighted assets), ratio | 0.1060 | 0.0954
Tier 1 risk-based capital (to risk-weighted assets), required for capital adequacy | $ 382,279 | $ 435,834
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) | $ 818,075 | $ 837,828
Total risk-based capital (to risk-weighted assets), ratio | 0.1284 | 0.1153
Total risk-based capital (to risk-weighted assets), required for capital adequacy | $ 509,705 | $ 581,112
Total risk-based capital (to risk-weighted assets), required for capital adequacy, ratio | 0.080 | 0.080

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