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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment securities
Within one year	$ 41,366
After one but within five years	142,465
After five but within ten years	13,925
After ten years	15,471
Available for sale securities	213,227
Mortgage-backed securities	57,157
Total	$ 270,384	$ 269,682

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Fair value 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 latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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