Borrowings - Customer Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]
Customer repurchase agreements	$ 41,974us-gaap_SecuredDebtRepurchaseAgreements	$ 37,256us-gaap_SecuredDebtRepurchaseAgreements	$ 96,282us-gaap_SecuredDebtRepurchaseAgreements
Weighted average interest rate at year end	0.06%	0.07%	0.07%
Maximum amount outstanding at any month's end	43,266	110,228	117,291
Average amount outstanding during the year	$ 41,048	$ 72,211	$ 106,206
Weighted average interest rate during the year	0.06%	0.06%	0.13%

Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph m

-Subparagraph 1

-Article 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Details

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- Definition

Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 10

-Section 55

-Paragraph 51

-URI http://asc.fasb.org/extlink&oid=45353962&loc=d3e101761-111710

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- Definition

Securities sold under agreement to repurchase average amount outstanding.

+ References

No definition available.

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- Definition

Securities sold under agreement to repurchase maximum amount outstanding.

+ References

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- Definition

Securities sold under agreement to repurchase weighted average interest rate during the year.

+ References

No definition available.

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