Deposits - Composition of Deposits (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Noninterest-bearing deposits
Demand deposits	$ 2,866,365us-gaap_DemandDepositAccounts	$ 2,562,980us-gaap_DemandDepositAccounts
Interest-bearing deposits
Savings deposits	1,962,086us-gaap_DepositsSavingsDeposits	1,646,111us-gaap_DepositsSavingsDeposits
Time deposits	776,207us-gaap_TimeDeposits	681,540us-gaap_TimeDeposits
Total deposits	$ 5,604,658us-gaap_Deposits	$ 4,890,631us-gaap_Deposits
Demand deposits, percentage of total deposits	51.10%	52.40%
Savings deposits, percentage of total deposits	35.00%	33.70%
Time deposits, percentage of total deposits	13.90%	13.90%
Percentage of deposit, total	100.00%	100.00%

Percentage of interest and non-interest bearing domestic deposits.

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.

+ References

+ Details

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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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9

+ Details

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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

+ Details

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- Details

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- Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

+ Details

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