Deposits - Time deposit maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deposits Disclosure [Line Items]
Time deposits	$ 1,773,430	$ 1,280,000
Carrying values of securities pledged as collateral	354,600	359,200
Scheduled maturities for time deposits:
2018	5,183,279
2019	635,279
2020	31,059
2021	1,828
2022 and thereafter	19,179
Time deposits	5,870,624	4,274,663
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	$ 336,800	$ 337,700

[Line Items] for Deposits Disclosure [Table]

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Minimum Eligible Collateral Pledged on Outstanding Deposits Percentage

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- Definition

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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The fair value of available-for-sale securities that serve as collateral for borrowings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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-Publisher SEC
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-Section V
-Paragraph D-E

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

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-Name Accounting Standards Codification
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