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Redemption of Long-term Debt (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Penalty on prepayment of debt | $ 0 |  | $ 2,210 |  | $ 205 | $ 2,539
Federal Home Loan Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Penalty on prepayment of debt |  |  | 2,210 | $ 329 |  |
Prepayment of debt |  |  | $ 38,886 | $ 3,483 |  |
Subordinated notes | Heritage Financial Statutory Trust One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate amount of debt |  | $ 10,515 |  |  |  |
Principal amount of debt |  | 10,310 |  |  |  |
Prepayment penalty |  | $ 205 |  |  |  |

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- Definition The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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