Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB
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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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- Definition

Percentage of vesting of share-based compensation awards.

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Stock-Based Compensation (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average grant date fair value (usd per share)			$ 8.58
Stock-based compensation expense	$ 2.2	$ 2.0	$ 7.4	$ 6.5
Stock-based compensation amortization expense unrecognized	$ 16.9		$ 16.9
Average remaining vesting, years			3 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded during the period	0	0	431,000	313,000
Incentive stock option's maximum term, years			3 years
Performance Shares \| Growth in Tangible Book Value per Share Plus Dividends
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights as a percentage			75.00%
Performance Shares \| Total Shareholder Return as Compared to Our Peer Group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights as a percentage			25.00%
Non-Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded during the period			534,000	492,000
Award vesting rights as a percentage			33.33%
Non-Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive stock option's maximum term, years			3 years
Non-Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive stock option's maximum term, years			6 years
2009 Employee Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	2,200,000		2,200,000
2016 Employee Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	8,300,000		8,300,000