Deposits - Time deposit maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deposits Disclosure [Line Items]
Time deposits	$ 1,856,715	$ 1,770,000
Carrying values of securities pledged as collateral	340,900	354,600
Scheduled maturities for time deposits:
2018	5,050,023
2019	75,275
2020	14,110
2021	19,260
2022 and thereafter	302
Time deposits	5,158,970	5,870,624
California State Treasurer
Deposits Disclosure [Line Items]
Time deposits	$ 300,000
Required eligible collateral pledge on outstanding deposits, minimum percentage	110.00%
Carrying values of securities pledged as collateral	$ 333,200	$ 336,800

[Line Items] for Deposits Disclosure [Table]

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Minimum Eligible Collateral Pledged on Outstanding Deposits Percentage

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Time Deposits, $250,000 or More

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Amount of time deposits maturing in the fifth fiscal year following the latest fiscal year, and all years following the fifth fiscal year. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of time deposits maturing in the fourth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of time deposits maturing in the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of time deposits maturing in the third fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of time deposits maturing in the second fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of time deposit liabilities, including certificates of deposit.

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