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REGULATORY CAPITAL REQUIREMENTS - Schedule of Capital and Capital Ratios (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
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