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Investment Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |
AFS accrued interest | $ 1,000 |  |
HTM, at amortized cost (fair value $352,454 and $348,505) | 396,784 |  | $ 399,494
HTM accrued interest | 2,200 |  |
Available-for-sale securities pledged as collateral | 376,200 |  | 338,800
Net gains | 0 | $ 0 |
FHLB |  |  |
Schedule of Investments [Line Items] |  |  |
Letter of credit outstanding, amount | $ 183,500 |  | $ 189,000

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