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Stock-based Compensation and Employee Benefits - (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense $ 200,000 $ 200,000   $ 400,000
Unrecognized compensation expense 800,000   $ 800,000  
Unrecognized compensation cost, weighted-average period, years     2 years 4 months 24 days  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)     65,990  
Weighted average grant-date fair value, Granted (in dollars per share)     $ 33.43  
Stock based compensation expense 800,000 $ 700,000 $ 1,400,000  
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)     $ 11.28  
Unrecognized compensation expense 300,000   $ 300,000  
Unrecognized compensation cost, weighted-average period, years     1 year 10 months 24 days  
Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)     49,758  
Weighted average grant-date fair value, Granted (in dollars per share)     $ 33.22  
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)     49,758 91,342
Unrecognized compensation expense $ 4,500,000   $ 4,500,000  
Unrecognized compensation cost, weighted-average period, years     2 years 1 month 6 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)     $ 34.04  
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)     $ 32.06  
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)     5,373  
Shares available for issuance 360,963   360,963  
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  
Minimum | Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [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  
Maximum | Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [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%