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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier One Capital Required for Capital Adequacy $ 203,314 $ 211,110
Common Equity Tier One Capital Required for Capital Adequacy to Average Assets 4.50% 4.50%
Common Equity Tier One Capital $ 555,644 $ 541,154
Common Equity Tier One Capital to Average Assets 12.30% 11.50%
Tier One Leverage Capital Required for Capital Adequacy $ 256,216 $ 212,578
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 0.040 0.040
Tier One Leverage Capital $ 576,531 $ 561,749
Tier One Leverage Capital to Average Assets 0.090 0.106
Tier One Risk Based Capital Required for Capital Adequacy $ 271,086 $ 281,479
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 0.060 0.060
Tier One Risk Based Capital $ 576,531 $ 561,749
Tier One Risk Based Capital to Risk Weighted Assets 0.128 0.120
Capital Required for Capital Adequacy $ 361,448 $ 375,306
Capital Required for Capital Adequacy to Risk Weighted Assets 0.080 0.080
Capital $ 633,061 $ 598,226
Capital to Risk Weighted Assets 0.140 0.128
Capital Conservation Buffer, Company 6.00%  
Capital Conservation Buffer, Bank 5.70%  
Heritage Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier One Capital Required for Capital Adequacy $ 203,112 $ 211,017
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 $ 293,383 $ 304,803
Common Equity Tier One Capital Required to be Well Capitalized to Average Assets 6.50% 6.50%
Common Equity Tier One Capital $ 563,630 $ 538,560
Common Equity Tier One Capital to Average Assets 12.50% 11.50%
Tier One Leverage Capital Required for Capital Adequacy $ 256,051 $ 211,187
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 0.040 0.040
Tier One Leverage Capital Required to be Well Capitalized $ 320,064 $ 263,984
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 0.050 0.050
Tier One Leverage Capital $ 563,630 $ 538,560
Tier One Leverage Capital to Average Assets 0.088 0.102
Tier One Risk Based Capital Required for Capital Adequacy $ 270,815 $ 281,356
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 $ 361,087 $ 375,142
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 0.080 0.080
Tier One Risk Based Capital $ 563,630 $ 538,560
Tier One Risk Based Capital to Risk Weighted Assets 0.125 0.115
Capital Required for Capital Adequacy $ 361,087 $ 375,142
Capital Required for Capital Adequacy to Risk Weighted Assets 0.080 0.080
Capital Required to be Well Capitalized $ 451,359 $ 468,927
Capital Required to be Well Capitalized to Risk Weighted Assets 0.100 0.100
Capital $ 620,124 $ 575,037
Capital to Risk Weighted Assets 0.137 0.123