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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities |  |
Within one year | $ 34,591 |
After one but within five years | 183,827 |
After five but within ten years | 53,597 |
After ten years | 73,329 |
Available for sale securities, Amortized Cost | 345,344 |
Mortgage-backed and other amortizing securities | 103,037 |
Available-for-sale, Amortized Cost | 448,381 | $ 450,454
Within one year | 33,607 |
After one but within five years | 169,269 |
After five but within ten years | 46,456 |
After ten years | 61,782 |
Available for sale securities, Fair Value | 311,114 |
Mortgage-backed and other amortizing securities | 83,299 |
Total | $ 394,413 | $ 398,927

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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