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Regulatory Capital Requirements - Schedule of Capital Ratios (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 capital ratio 0.120 0.129
Leverage ratio 0.100 0.100
Tier 1 capital ratio 0.124 0.133
Total capital ratio 0.133 0.141
Banking Regulation, Tier 1 Risk-Based Capital, Actual $ 698,412 $ 704,839
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual 676,354 683,074
Banking Regulation, Tier 1 Leverage Capital, Actual 698,412 704,839
Banking Regulation, Total Capital, Actual 749,854 750,945
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 450,307 425,084
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum 337,730 318,813
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum 253,298 239,110
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum 278,910 281,673
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum 562,884 531,355
Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum 450,307 425,084
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum 365,874 345,381
Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum $ 348,637 $ 352,092
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.080 0.080
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.060 0.060
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.045 0.045
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum 0.040 0.040
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.100 0.100
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum 0.080 0.080
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum 0.065 0.065
Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum 0.050 0.050
Heritage Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 capital ratio 0.123 0.129
Leverage ratio 0.099 0.098
Tier 1 capital ratio 0.123 0.129
Total capital ratio 0.132 0.138
Banking Regulation, Tier 1 Risk-Based Capital, Actual $ 690,780 $ 686,273
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual 690,780 686,273
Banking Regulation, Tier 1 Leverage Capital, Actual 690,780 686,273
Banking Regulation, Total Capital, Actual 742,222 732,379
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 450,002 424,808
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum 337,502 318,606
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum 253,126 238,954
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum 278,749 281,539
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum 562,503 531,009
Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum 450,002 424,808
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum 365,627 345,156
Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum $ 348,436 $ 351,923
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.080 0.080
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.060 0.060
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum 0.045 0.045
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum 0.040 0.040
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum 0.100 0.100
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum 0.080 0.080
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum 0.065 0.065
Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum 0.050 0.050