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Deposits (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Deposits Disclosure [Line Items]
Time Deposits, $250,000 or More	$ 1,810,000,000	$ 1,770,000,000
Securities pledged as collateral	0
California State Treasurer
Deposits Disclosure [Line Items]
Time Deposits, $250,000 or More	300,000,000.0	300,000,000
Securities pledged as collateral	333,700,000	336,800,000
Brokered deposits	1,480,000,000	1,570,000,000
Money market and NOW accounts | California State Treasurer
Deposits Disclosure [Line Items]
Brokered deposits	266,900,000	370,400,000
Time deposits | California State Treasurer
Deposits Disclosure [Line Items]
Brokered deposits	$ 1,210,000,000	$ 1,200,000,000

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[Line Items] for Deposits Disclosure [Table]

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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