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Stock-based Compensation and Employee Benefits - (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 5,073,073   5,073,073  
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]        
Stock based compensation expense $ 200,000 $ 200,000 $ 400,000 $ 300,000
Unrecognized compensation expense 900,000   $ 900,000  
Unrecognized compensation cost, weighted-average period, years     2 years 3 months 18 days  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)     110,685  
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)     $ 18.92  
Stock based compensation expense 700,000 $ 700,000 $ 1,400,000 $ 1,200,000
Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)     84,091  
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)     $ 19.61  
Unrecognized compensation expense 2,500,000   $ 2,500,000  
Unrecognized compensation cost, weighted-average period, years     1 year 11 months 16 days  
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)     $ 11.28  
Unrecognized compensation expense 200,000   $ 200,000  
Unrecognized compensation cost, weighted-average period, years     2 years 8 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)     $ 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  
Unrecognized compensation expense $ 1,200,000   $ 1,200,000  
Unrecognized compensation cost, weighted-average period, years     2 years 8 months 12 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)     $ 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)     $ 16.52  
Employee Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 400,000   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)     10,458  
Shares available for issuance 375,057   375,057  
Minimum | Stock options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year  
Share Based Compensation Arrangement By Share Based Payment Award Options Granted Contractual Term     7 years  
Minimum | Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award 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]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years  
Share Based Compensation Arrangement By Share Based Payment Award Options Granted Contractual Term     10 years  
Maximum | Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award 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%