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REGULATORY CAPITAL REQUIREMENTS - Schedule of Capital and Capital Ratios (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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HomeStreet Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 leverage capital | $ 822,891 | $ 727,753
Tier 1 leverage capital to average assets, ratio | 0.0863 | 0.1011
Tier 1 leverage capital required for capital adequacy purposes | $ 381,506 | $ 287,990
Tier 1 leverage capital required for capital adequacy purposes, ratio | 0.040 | 0.040
Tier 1 leverage capital required to be categorized as well capitalized | $ 476,883 | $ 359,988
Tier 1 leverage capital required to be categorized as well capitalized, ratio | 0.050 | 0.050
Common equity risk-based capital | $ 822,891 | $ 727,753
Common equity risk-based capital to risk weighted assets, ratio | 0.1192 | 0.1287
Common equity risk-based capital required for capital adequacy | $ 310,582 | $ 254,442
Common equity risk-based capital required for capital adequacy, ratio | 0.045 | 0.045
Common equity capital required to be well capitalized | $ 448,618 | $ 367,527
Common equity risk-based capital required to be well capitalized, ratio | 0.065 | 0.065
Tier 1 risk-based capital | $ 822,891 | $ 727,753
Tier 1 risk-based capital to risk weighted assets, ratio | 0.1192 | 0.1287
Tier 1 risk-based capital required for capital adequacy | $ 414,109 | $ 339,256
Tier 1 risk-based capital required for capital adequacy, ratio | 0.060 | 0.060
Tier 1 risk-based capital required to be well capitalized | $ 552,146 | $ 452,341
Tier 1 risk-based capital required to be well capitalized, ratio | 0.080 | 0.080
Total risk-based capital | $ 868,993 | $ 778,723
Capital to risk weighted assets, ratio | 0.1259 | 0.1377
Total capital required for capital adequacy | $ 552,146 | $ 452,341
Total capital required for capital adequacy, ratio | 0.080 | 0.080
Total capital required to be well capitalized | $ 690,182 | $ 565,426
Total capital 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 | $ 693,112 | $ 723,232
Tier 1 leverage capital to average assets, ratio | 0.0725 | 0.0994
Tier 1 leverage capital required for capital adequacy purposes | $ 382,467 | $ 291,098
Tier 1 leverage capital required for capital adequacy purposes, ratio | 0.040 | 0.040
Common equity risk-based capital | $ 633,112 | $ 663,232
Common equity risk-based capital to risk weighted assets, ratio | 0.0872 | 0.1084
Common equity risk-based capital required for capital adequacy | $ 326,876 | $ 275,281
Common equity risk-based capital required for capital adequacy, ratio | 0.045 | 0.045
Tier 1 risk-based capital | $ 693,112 | $ 723,232
Tier 1 risk-based capital to risk weighted assets, ratio | 0.0954 | 0.1182
Tier 1 risk-based capital required for capital adequacy | $ 435,834 | $ 367,041
Tier 1 risk-based capital required for capital adequacy, ratio | 0.060 | 0.060
Total risk-based capital | $ 837,828 | $ 774,695
Capital to risk weighted assets, ratio | 0.1153 | 0.1266
Total capital required for capital adequacy | $ 581,112 | $ 489,388
Total capital required for capital adequacy, ratio | 0.080 | 0.080

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