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Investment securities - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)
Value of common stock | $	$ 14,777	$ 14,798
Visa Class A stock
Conversion ratio of common stock	1.6228
Shares to be issued following resolution of Visa litigation	72,997
Visa Class B stock
Shares held	44,982

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The conversion ratio of common stock if such stock is convertible.

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The number of shares that will be issued following resolution of Visa litigation.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Balance held at close of period in number of shares.

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