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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier One Capital Required for Capital Adequacy $ 200,525 $ 203,314
Common Equity Tier One Capital Required for Capital Adequacy to Average Assets 4.50% 4.50%
Common Equity Tier One Capital $ 600,390 $ 555,644
Tier One Leverage Capital Required for Capital Adequacy $ 285,791 $ 256,216
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 0.040 0.040
Tier One Leverage Capital $ 621,570 $ 576,531
Tier One Leverage Capital to Average Assets 0.087 0.090
Tier One Risk Based Capital Required for Capital Adequacy $ 267,367 $ 271,086
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 0.060 0.060
Tier One Risk Based Capital $ 621,570 $ 576,531
Tier One Risk Based Capital to Risk Weighted Assets 0.139 0.128
Capital Required for Capital Adequacy $ 356,489 $ 361,448
Capital Required for Capital Adequacy to Risk Weighted Assets 0.080 0.080
Capital $ 660,209 $ 633,061
Capital to Risk Weighted Assets 0.148 0.140
Capital Conservation Buffer, Company 6.80%  
Capital Conservation Buffer, Bank 6.70%  
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual 0.135 0.123
Heritage Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier One Capital Required for Capital Adequacy $ 200,408 $ 203,112
Common Equity Tier One Capital Required for Capital Adequacy to Average Assets 4.50% 4.50%
Common Equity Tier One Capital Required to be Well-Capitalized $ 289,478 $ 293,383
Common Equity Tier One Capital Required to be Well Capitalized to Average Assets 6.50% 6.50%
Common Equity Tier One Capital $ 615,820 $ 563,630
Tier One Leverage Capital Required for Capital Adequacy $ 285,657 $ 256,051
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 0.040 0.040
Tier One Leverage Capital Required to be Well Capitalized $ 357,071 $ 320,064
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 0.050 0.050
Tier One Leverage Capital $ 615,820 $ 563,630
Tier One Leverage Capital to Average Assets 0.086 0.088
Tier One Risk Based Capital Required for Capital Adequacy $ 267,210 $ 270,815
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 0.060 0.060
Tier One Risk Based Capital Required to be Well Capitalized $ 356,280 $ 361,087
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 0.080 0.080
Tier One Risk Based Capital $ 615,820 $ 563,630
Tier One Risk Based Capital to Risk Weighted Assets 0.138 0.125
Capital Required for Capital Adequacy $ 356,280 $ 361,087
Capital Required for Capital Adequacy to Risk Weighted Assets 0.080 0.080
Capital Required to be Well Capitalized $ 445,350 $ 451,359
Capital Required to be Well Capitalized to Risk Weighted Assets 0.100 0.100
Capital $ 654,459 $ 620,124
Capital to Risk Weighted Assets 0.147 0.137
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual 0.138 0.125