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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investment securities
Within one year	$ 74,667
After one but within five years	163,400
After five but within ten years	77,493
After ten years	68,668
Available for sale securities, Amortized Cost	384,228
Mortgage-backed and other amortizing securities	217,042
Available-for-sale, Amortized Cost	601,270	$ 450,454
Within one year	73,596
After one but within five years	154,865
After five but within ten years	71,741
After ten years	59,093
Available for sale securities, Fair Value	359,295
Mortgage-backed and other amortizing securities	203,191
Total	$ 562,486	$ 398,927

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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 sixth through tenth 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).

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