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Deposits - Composition of Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Noninterest-bearing Deposit Liabilities [Abstract]
Noninterest-bearing deposits	$ 5,204,787	$ 3,846,436
Interest-bearing deposits:
Investment checking	460,972	433,971
Money market	2,236,018	1,517,050
Savings	393,769	364,049
Time deposits	531,944	385,347
Total deposits	$ 8,827,490	$ 6,546,853
Noninterest-bearing deposits, percentage of total deposits	58.96%	58.75%
Investment checking, percentage of total deposits	5.22%	6.63%
Money market, percentage of total deposits	25.33%	23.17%
Savings, percentage of total deposits	4.46%	5.56%
Time deposits, percentage of total deposits	6.03%	5.89%
Percentage of deposit, total	100.00%	100.00%

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Investment checking deposits.

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- Definition

Percentage of interest and non-interest bearing domestic deposits.

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- Definition

Percentage of non-interest-bearing domestic deposits to deposits demand.

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- Definition

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.

+ References

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)
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- Definition

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.

+ References

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)
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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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Percentage of interest-bearing domestic checking demand deposit liabilities to total deposit liabilities.

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Percentage of interest-bearing domestic money market demand account deposit liabilities to total deposit liabilities.

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Percentage of interest-bearing domestic savings deposit liabilities to total deposit liabilities.

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Percentage of interest-bearing domestic time deposit liabilities to total deposit liabilities.

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- Definition

Amount of time deposit liabilities, including certificates of deposit.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
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