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Investment securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2023
Summary of significant accounting policies |  |  |
Net unrealized losses on available-for-sale securities | $ 43,500 | $ 52,000 |
Deferred income taxes on available-for-sale securities | 12,000 | 14,300 |
Proceeds from sale of available-for-sale investment securities | 65,600 |  |
Net gain on available-for-sale securities | 81 |  |
Allowance for credit loss on available-for-sale debt securities | 0 | $ 0 |
Allowance for credit loss on held-to-maturity | $ 0 |  | $ 0

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