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REGULATORY CAPITAL REQUIREMENTS - Schedule of Capital and Capital Ratios (Details) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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HomeStreet Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 leverage capital | $ 727,753 | $ 712,533
Tier 1 leverage capital to average assets, ratio | 0.1011 | 0.0979
Tier 1 leverage capital required for capital adequacy purposes | $ 287,990 | $ 291,114
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 | $ 359,988 | $ 363,893
Tier 1 leverage capital required to be categorized as well capitalized, ratio | 0.050 | 0.050
Common equity risk-based capital | $ 727,753 | $ 712,533
Common equity risk-based capital to risk weighted assets, ratio | 12.87% | 13.51%
Common equity risk-based capital required for capital adequacy | $ 254,442 | $ 237,307
Common equity risk-based capital required for capital adequacy, ratio | 4.50% | 4.50%
Common equity capital required to be well capitalized | $ 367,527 | $ 342,777
Common equity risk-based capital required to be well capitalized, ratio | 6.50% | 6.50%
Tier 1 risk-based capital | $ 727,753 | $ 712,533
Tier 1 risk-based capital to risk weighted assets, ratio | 0.1287 | 0.1351
Tier 1 risk-based capital required for capital adequacy | $ 339,256 | $ 316,410
Tier 1 risk-based capital required for capital adequacy, ratio | 0.060 | 0.060
Tier 1 risk-based capital required to be well capitalized | $ 452,341 | $ 421,880
Tier 1 risk-based capital required to be well capitalized, ratio | 0.080 | 0.080
Total risk-based capital | $ 778,723 | $ 778,479
Capital to risk weighted assets, ratio | 0.1377 | 0.1476
Total capital required for capital adequacy | $ 452,341 | $ 421,880
Total capital required for capital adequacy, ratio | 0.080 | 0.080
Total capital required to be well capitalized | $ 565,426 | $ 527,350
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 | $ 723,232 | $ 709,655
Tier 1 leverage capital to average assets, ratio | 0.0994 | 0.0965
Tier 1 leverage capital required for capital adequacy purposes | $ 291,098 | $ 294,211
Tier 1 leverage capital required for capital adequacy purposes, ratio | 0.040 | 0.040
Common equity risk-based capital | $ 663,232 | $ 649,655
Common equity risk-based capital to risk weighted assets, ratio | 10.84% | 11.67%
Common equity risk-based capital required for capital adequacy | $ 275,281 | $ 250,537
Common equity risk-based capital required for capital adequacy, ratio | 4.50% | 4.50%
Tier 1 risk-based capital | $ 723,232 | $ 709,655
Tier 1 risk-based capital to risk weighted assets, ratio | 0.1182 | 0.1275
Tier 1 risk-based capital required for capital adequacy | $ 367,041 | $ 334,050
Tier 1 risk-based capital required for capital adequacy, ratio | 0.060 | 0.060
Total risk-based capital | $ 774,695 | $ 779,254
Capital to risk weighted assets, ratio | 0.1266 | 0.1400
Total capital required for capital adequacy | $ 489,388 | $ 445,400
Total capital required for capital adequacy, ratio | 0.080 | 0.080

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