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Deposits - Composition of Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Noninterest-bearing Deposit Liabilities [Abstract]
Noninterest-bearing deposits	$ 3,846,436	$ 3,673,541
Interest-bearing deposits:
Investment checking	433,971	407,058
Money market	1,517,050	1,504,021
Savings	364,049	342,236
Time deposits	385,347	382,824
Total deposits	$ 6,546,853	$ 6,309,680
Noninterest-bearing deposits, percentage of total deposits	58.75%	58.22%
Investment checking, percentage of total deposits	6.63%	6.45%
Money market, percentage of total deposits	23.17%	23.84%
Savings, percentage of total deposits	5.56%	5.42%
Time deposits, percentage of total deposits	5.89%	6.07%
Percentage of deposit, total	100.00%	100.00%

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- Definition

Investment checking deposits.

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- Definition

Percentage of interest and non-interest bearing domestic deposits.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-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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- 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://www.xbrl.org/2003/role/presentationRef
-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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

Percentage of interest-bearing domestic checking demand deposit liabilities to total deposit liabilities.

+ References

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- Definition

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

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- Definition

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

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- Definition

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.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section V
-Paragraph D-E

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