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Allowance for Loan Losses - Summary of Loans Based on Method for Determining Allowance (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans $ 5,997,147   $ 5,193,187      
Allowance for loan losses 33,706 $ 31,995 29,126 $ 27,046 $ 24,513 $ 22,880
New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 5,523,071   4,610,763      
Allowance for loan losses 28,510     19,579    
Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 474,076   582,424      
Allowance for loan losses 1,926     2,299    
Total real estate loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 4,765,392   4,166,072      
Total real estate loans | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 66   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 4,330,691   3,632,563      
Loans - Recorded Investment, ASC 310-30 Loans 4,330,757   3,632,563      
Allowance for Credit Loss, Individually Evaluated for Impairment 66   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 19,361   16,547      
Total real estate loans | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 8,224   8,705      
Loans - Recorded Investment, Collectively Evaluated for Impairment 182,887   208,237      
Allowance for Credit Loss, Individually Evaluated for Impairment 1,013   1,228      
Allowance for Credit Loss, Collectively Evaluated for Impairment 854   978      
Commercial real estate            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 1,437,270   1,301,754      
Allowance for loan losses 9,745 9,454 8,450 9,652 9,296 8,206
Commercial real estate | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 1,209,762   998,141      
Loans - Recorded Investment, ASC 310-30 Loans 1,209,762   998,141      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 6,696   5,468      
Allowance for loan losses 6,696     5,692    
Commercial real estate | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 4,923   5,282      
Loans - Recorded Investment, Collectively Evaluated for Impairment 39,757   50,703      
Allowance for Credit Loss, Individually Evaluated for Impairment 731   829      
Allowance for Credit Loss, Collectively Evaluated for Impairment 204   255      
Allowance for loan losses 935     1,375    
Owner-occupied commercial real estate            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 590,814   545,829      
Allowance for loan losses 2,252 2,281 2,243 1,548 1,252 1,020
Owner-occupied commercial real estate | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 571,558   524,728      
Loans - Recorded Investment, ASC 310-30 Loans 571,558   524,728      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 1,912   1,780      
Allowance for loan losses 1,912     1,494    
Owner-occupied commercial real estate | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 2,127   2,244      
Loans - Recorded Investment, Collectively Evaluated for Impairment 17,129   18,857      
Allowance for Credit Loss, Individually Evaluated for Impairment 282   399      
Allowance for Credit Loss, Collectively Evaluated for Impairment 58   64      
Allowance for loan losses 340     54    
1-4 single family residential            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 2,033,060   1,666,288      
Allowance for loan losses 7,439 7,309 6,425 5,744 5,213 4,740
1-4 single family residential | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 1,923,092   1,541,255      
Loans - Recorded Investment, ASC 310-30 Loans 1,923,092   1,541,255      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 7,099   6,067      
Allowance for loan losses 7,099     5,139    
1-4 single family residential | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 267   263      
Loans - Recorded Investment, Collectively Evaluated for Impairment 74,301   83,848      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 282   332      
Allowance for loan losses 282     335    
Construction, land and development            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 614,249   571,849      
Allowance for loan losses 3,763 3,415 3,404 3,024 2,312 2,456
Construction, land and development | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 582,615   537,494      
Loans - Recorded Investment, ASC 310-30 Loans 582,615   537,494      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 3,378   3,040      
Allowance for loan losses 3,378     2,175    
Construction, land and development | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 6,338   6,338      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 37   36      
Allowance for loan losses 37     56    
Home equity loans and lines of credit            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 89,999   80,352      
Allowance for loan losses 615 499 483 563 398 355
Home equity loans and lines of credit | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 66   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 43,664   30,945      
Loans - Recorded Investment, ASC 310-30 Loans 43,730   30,945      
Allowance for Credit Loss, Individually Evaluated for Impairment 66   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 276   192      
Allowance for loan losses 342     131    
Home equity loans and lines of credit | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 907   916      
Loans - Recorded Investment, Collectively Evaluated for Impairment 45,362   48,491      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 273   291      
Allowance for loan losses 273     432    
Total other loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 1,231,755   1,027,115      
Total other loans | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 1,192,314   978,200      
Loans - Recorded Investment, ASC 310-30 Loans 1,192,314   978,200      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 9,083   7,198      
Total other loans | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 877   877      
Loans - Recorded Investment, Collectively Evaluated for Impairment 7,364   8,865      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 59   64      
Commercial and industrial            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 1,224,573   1,018,898      
Allowance for loan losses 9,465 8,580 7,665 6,059 5,705 5,745
Commercial and industrial | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 1,187,788   972,803      
Loans - Recorded Investment, ASC 310-30 Loans 1,187,788   972,803      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 9,044   7,152      
Allowance for loan losses 9,044     4,885    
Commercial and industrial | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 877   877      
Loans - Recorded Investment, Collectively Evaluated for Impairment 6,924   8,435      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 55   60      
Allowance for loan losses 55     41    
Consumer            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 7,182   8,217      
Allowance for loan losses 427 $ 457 456 456 $ 337 $ 358
Consumer | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 4,526   5,397      
Loans - Recorded Investment, ASC 310-30 Loans 4,526   5,397      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 39   46      
Allowance for loan losses 39     63    
Consumer | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, Individually Evaluated for Impairment 0   0      
Loans - Recorded Investment, Collectively Evaluated for Impairment 440   430      
Allowance for Credit Loss, Individually Evaluated for Impairment 0   0      
Allowance for Credit Loss, Collectively Evaluated for Impairment 4   4      
Allowance for loan losses 4     6    
ASC 310-30 Loans | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 274,724   355,740      
Allowance for loan losses 3,270     5,168    
ASC 310-30 Loans | Total real estate loans | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | Total real estate loans | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 243,524   316,567      
Allowance for loan losses 2,520   2,252      
ASC 310-30 Loans | Commercial real estate | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | Commercial real estate | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 182,828   247,628      
Allowance for loan losses 2,114   1,898 2,585    
ASC 310-30 Loans | Owner-occupied commercial real estate | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | Owner-occupied commercial real estate | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0 0    
ASC 310-30 Loans | 1-4 single family residential | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | 1-4 single family residential | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 35,400   40,922      
Allowance for loan losses 58   26 270    
ASC 310-30 Loans | Construction, land and development | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | Construction, land and development | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 25,296   28,017      
Allowance for loan losses 348   328 793    
ASC 310-30 Loans | Home equity loans and lines of credit | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | Home equity loans and lines of credit | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0 0    
ASC 310-30 Loans | Total other loans | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | Total other loans | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 31,200   39,173      
Allowance for loan losses 750   859      
ASC 310-30 Loans | Commercial and industrial | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | Commercial and industrial | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 28,984   36,783      
Allowance for loan losses 366   453 1,133    
ASC 310-30 Loans | Consumer | New Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 0   0      
Allowance for loan losses 0   0      
ASC 310-30 Loans | Consumer | Acquired Loans            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Loans - Recorded Investment, ASC 310-30 Loans 2,216   2,390      
Allowance for loan losses $ 384   $ 406 $ 387