The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9

Name:	us-gaap_NoninterestIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Derivatives - Net Gains/(Losses) Recorded in Noninterest Income Relating to Instruments Not Designated as Hedges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Noninterest income	$ 2,905us-gaap_NoninterestIncome	$ 4,174us-gaap_NoninterestIncome	$ 3,438us-gaap_NoninterestIncome	$ 3,224us-gaap_NoninterestIncome	$ 4,124us-gaap_NoninterestIncome	$ 3,548us-gaap_NoninterestIncome	$ 6,384us-gaap_NoninterestIncome	$ 5,693us-gaap_NoninterestIncome	$ 13,741us-gaap_NoninterestIncome	$ 19,749us-gaap_NoninterestIncome	$ 22,731us-gaap_NoninterestIncome
Interest Rate Caps [Member] \| Not Designated as Hedging Instrument [Member]
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Noninterest income									$ (366)	$ 110