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Investment Securities - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |  |  |
Available-for-sale Securities Pledged as Collateral | $ 392,300,000 |  | $ 392,300,000 |  | $ 244,800,000
Gain on sales of investment securities | 0 | $ 79,000 | 0 | $ 79,000 |
FHLB |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Letter of credit outstanding, amount | $ 265,300,000 |  | $ 265,300,000 |  | $ 450,900,000

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