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Deposits (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Deposits Disclosure [Line Items]
Time Deposits, $250,000 or More	$ 1,690,000,000	$ 1,850,000,000
Securities pledged as collateral	325,000,000.0	376,100,000
Brokered deposits	720,600,000	1,140,000,000
Noninterest bearing	5,427,174,000	4,814,254,000
Money market and NOW accounts	5,009,419,000	5,232,413,000
Savings deposits	305,326,000	300,770,000
Time deposits	3,559,350,000	3,986,475,000
Total deposits	$ 14,301,269,000	$ 14,333,912,000
Percent of total deposit balance, by type	100.00%	100.00%
Money market and NOW accounts
Deposits Disclosure [Line Items]
Brokered deposits	$ 376,600,000	$ 735,000,000.0
Percent of total deposit balance, by type	35.00%	36.00%
Time deposit accounts
Deposits Disclosure [Line Items]
Brokered deposits	$ 344,000,000.0	$ 400,600,000
Noninterest Bearing Demand Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	38.00%	34.00%
Savings Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	2.00%	2.00%
Bank Time Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	25.00%	28.00%
California State Treasurer
Deposits Disclosure [Line Items]
Time Deposits, $250,000 or More		$ 300,000,000.0
Required eligible collateral pledge on outstanding deposits, minimum percentage	110.00%
Securities pledged as collateral	$ 319,300,000	$ 368,200,000

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[Line Items] for Deposits Disclosure [Table]

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Minimum Eligible Collateral Pledged on Outstanding Deposits Percentage

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Percent Of Total Deposits Balance

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Time Deposits, $250,000 or More

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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-Topic 942
-SubTopic 210
-Section S99
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Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts. Also includes amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written.

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Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).

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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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The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

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Amount of time deposit liabilities, including certificates of deposit.

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