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Derivatives - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Derivative [Line Items] |  |  |  |  |
Termination value of derivatives in net liability position | $ 0.0 |  | $ 0.0 |  |
Interest rate lock commitments notional value |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 39.0 |  | 39.0 |  | $ 13.8
Forward contract notional value |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 39.7 |  | 39.7 |  | 17.7
Not designated as hedging instrument | Interest rate swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 544.7 |  | 544.7 |  | 464.9
Derivative fee income from non-designated hedges | 0.3 | $ 0.4 | 1.2 | $ 0.7 |
Fair value hedges | Designated as hedging instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedged Loans |  |  | 470.0 |  | 469.4
Cumulative fair value hedge adjustment |  |  | (16.1) |  | 22.6
Fair value hedges | Designated as hedging instrument | Interest rate swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 355.6 |  | 355.6 |  | 351.0
Cumulative fair value hedge adjustment |  |  | (18.8) |  | $ 25.7
Cash flow hedges | Designated as hedging instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 200.0 |  | 200.0 |  |
Reclassification of accumulated other comprehensive income during the next 12 months |  |  | $ 1.0 |  |

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- Definition The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-6 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
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