Assumed dividend yield prior to initial public offering.

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Number Of Simulation For Valuing Market Vesting Component Of Restricted Stock

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- Definition

Represents the performance period over which a performance results are measured, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Percentage of award based on specified performance condition.

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- Definition

The maximum value of shares, which an employee can purchase per calendar year.

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Share Based Compensation Arrangement By Share Based Payment Award Options Granted Contractual Term

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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No definition available.

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Percentage of initial target of share-based compensation awards.

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Award Other Than An Option or Stock Appreciation Right Granted

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Option or Stock Appreciation Right Granted

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No definition available.

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- Definition

Term Of Geometric Brownian Motion Used For Simulating Equity Prices

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No definition available.

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- Definition

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.

+ References

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

Aggregate dividends declared during the period for each share of common stock outstanding.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-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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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

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 highest quantity of shares an employee can purchase under the plan per period.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

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No definition available.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock-based Compensation and Employee Benefits - (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) item $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	5,588,905
Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Option or Stock Appreciation Right Granted	1
Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Award Other Than An Option or Stock Appreciation Right Granted	3.25
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed dividend yield prior to initial public offering \| $ / shares	$ 0.00
Stock based compensation expense \| $	$ 700,000	$ 700,000	$ 1,200,000
Unrecognized compensation expense \| $	$ 600,000
Unrecognized compensation cost, weighted-average period, years	1 year 10 months 24 days
Stock options [Member] \| NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage	33.33%	33.33%	33.33%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	122,992
Share Based Compensation Arrangement By Share Based Payment Award Options Granted Contractual Term	10 years
Weighted average grant-date fair value, Granted (in dollars per share) \| $ / shares	$ 19.15
Number Of Simulation For Valuing Market Vesting Component Of Restricted Stock \| item	100,000
Term Of Geometric Brownian Motion Used For Simulating Equity Prices	10 years
Stock based compensation expense \| $	$ 2,600,000	$ 2,600,000	$ 2,300,000
Market-based stock awards \| NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	26,594
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period	5 years
Weighted average grant-date fair value, Granted (in dollars per share) \| $ / shares	$ 11.28
Unrecognized compensation expense \| $	$ 300,000
Unrecognized compensation cost, weighted-average period, years	2 years 2 months 12 days
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	91,342
Weighted average grant-date fair value, Granted (in dollars per share) \| $ / shares	$ 18.22
Performance stock units \| NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	91,342
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period	3 years
Unrecognized compensation expense \| $	$ 1,000,000
Unrecognized compensation cost, weighted-average period, years	2 years 4 months 24 days
Performance stock units \| NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member] \| EPS target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards based on performance type	60.00%
Weighted average grant-date fair value, Granted (in dollars per share) \| $ / shares	$ 19.56
Performance stock units \| NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member] \| TSR target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards based on performance type	40.00%
Weighted average grant-date fair value, Granted (in dollars per share) \| $ / shares	$ 16.52
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	400,000
Maximum stock purchases by employees, value \| $	$ 25,000
Maximum stock purchases by employees (in shares)	2,000
Discount on purchase of common stock (as a percent)	90.00%
Offering period for employee stock purchases	6 months
Employees purchased shares under the ESPP (in shares)	19,178
Shares available for issuance	366,337
Minimum \| Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Share Based Compensation Arrangement By Share Based Payment Award Options Granted Contractual Term	7 years
Common Stock, Dividends, Per Share, Declared \| $ / shares	$ 0.05
Minimum \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum \| Performance stock units \| NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of initial target awards	0.00%
Maximum \| Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Share Based Compensation Arrangement By Share Based Payment Award Options Granted Contractual Term	10 years
Common Stock, Dividends, Per Share, Declared \| $ / shares	$ 0.07
Maximum \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum \| Performance stock units \| NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of initial target awards	150.00%