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Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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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

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