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Allowance for Loan Losses - Activity in Allowance for Losses Disaggregated on Basis of Impairment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period $ 28,483 $ 28,380 $ 28,824 $ 28,594  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs (824) (794) (2,893) (3,520)  
Recoveries 89 91 668 437  
Provision for loan losses for noncovered loans 594 1,078 1,743 3,244  
Balance at the end of period 28,342 28,755 28,342 28,755  
Allowance for loan losses         28,824
Commercial and Industrial
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 11,304 12,178 13,478 9,912  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs (309) (140) (1,791) (2,318)  
Recoveries 43 19 544 164  
Provision for loan losses for noncovered loans 234 1,387 (959) 5,686  
Balance at the end of period 11,272 13,444 11,272 13,444  
Allowance for loan losses         13,478
Owner-occupied Commercial Real Estate
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 4,200 3,725 4,049 4,021  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs (128) (189) (128) (189)  
Recoveries 0 0 0 155  
Provision for loan losses for noncovered loans (9) 345 142 (106)  
Balance at the end of period 4,063 3,881 4,063 3,881  
Allowance for loan losses         4,049
Non-owner Occupied Commercial Real Estate
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 5,685 6,287 5,326 5,369  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs (72) 0 (72) 0  
Recoveries 0 0 0 0  
Provision for loan losses for noncovered loans 163 (31) 522 887  
Balance at the end of period 5,776 6,256 5,776 6,256  
Allowance for loan losses         5,326
One-to-four Family Residential
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 1,155 1,098 1,100 1,221  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs 0 0 0 (52)  
Recoveries 0 0 0 0  
Provision for loan losses for noncovered loans 200 5 255 (66)  
Balance at the end of period 1,355 1,103 1,355 1,103  
Allowance for loan losses         1,100
Real Estate Construction and Land Development: One-to-four Family Residential
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 1,533 2,207 1,720 3,131  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs 0 (423) (345) (423)  
Recoveries 0 0 43 0  
Provision for loan losses for noncovered loans 235 (291) 350 (1,215)  
Balance at the end of period 1,768 1,493 1,768 1,493  
Allowance for loan losses         1,720
Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 1,630 639 953 2,309  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs 0 0 0 (142)  
Recoveries 0 0 0 32  
Provision for loan losses for noncovered loans (926) (19) (249) (1,579)  
Balance at the end of period 704 620 704 620  
Allowance for loan losses         953
Consumer
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 2,175 1,418 1,597 1,761  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs (315) (42) (557) (396)  
Recoveries 46 72 81 86  
Provision for loan losses for noncovered loans 884 64 1,669 61  
Balance at the end of period 2,790 1,512 2,790 1,512  
Allowance for loan losses         1,597
Unallocated
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 801 828 601 870  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for loan losses for noncovered loans (187) (382) 13 (424)  
Balance at the end of period 614 446 614 446  
Allowance for loan losses         601
Noncovered Loans
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 22,369 22,611 22,657 24,242  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs (805) (794) (2,020) (3,480)  
Recoveries 89 91 667 437  
Provision for loan losses for noncovered loans 567 875 916 1,584  
Balance at the end of period 22,220 22,783 22,220 22,783  
Individually evaluated for impairment 3,738   3,738   4,039
Collectively evaluated for impairment 14,503   14,503   14,374
Noncovered Loans | Commercial and Industrial
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 1,759   1,759   2,716
Collectively evaluated for impairment 6,010   6,010   6,727
Noncovered Loans | Owner-occupied Commercial Real Estate
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 463   463   595
Collectively evaluated for impairment 2,094   2,094   2,101
Noncovered Loans | Non-owner Occupied Commercial Real Estate
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 608   608   364
Collectively evaluated for impairment 2,580   2,580   2,516
Noncovered Loans | One-to-four Family Residential
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 195   195   0
Collectively evaluated for impairment 593   593   570
Noncovered Loans | Real Estate Construction and Land Development: One-to-four Family Residential
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 434   434   211
Collectively evaluated for impairment 323   323   429
Noncovered Loans | Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 211   211   0
Collectively evaluated for impairment 407   407   855
Noncovered Loans | Consumer
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 68   68   153
Collectively evaluated for impairment 1,882   1,882   575
Noncovered Loans | Unallocated
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 614   614   601
Covered Loans
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at the beginning of period 6,114 5,769 6,167 4,352  
Schedule of allowance for loan losses on the basis of impairment method          
Charge-offs (19) 0 (873) (40)  
Recoveries 0 0 1 0  
Provision for loan losses for noncovered loans 27 203 827 1,660  
Balance at the end of period 6,122 5,972 6,122 5,972  
Individually evaluated for impairment 623   623   660
Collectively evaluated for impairment 110   110   109
Covered Loans | Commercial and Industrial
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 560   560   629
Collectively evaluated for impairment 16   16   18
Covered Loans | Owner-occupied Commercial Real Estate
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 3   3   7
Covered Loans | Non-owner Occupied Commercial Real Estate
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 63   63   0
Collectively evaluated for impairment 69   69   14
Covered Loans | One-to-four Family Residential
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 0   0   31
Collectively evaluated for impairment 8   8   13
Covered Loans | Real Estate Construction and Land Development: One-to-four Family Residential
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 0   0   0
Covered Loans | Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 0   0   0
Covered Loans | Consumer
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 14   14   57
Covered Loans | Unallocated
         
Schedule of allowance for loan losses on the basis of impairment method          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 0   0   0
Noncovered PCI Loans
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         4,244
Allowance for loan losses 3,979   3,979    
Noncovered PCI Loans | Commercial and Industrial
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         2,294
Allowance for loan losses 2,161   2,161    
Noncovered PCI Loans | Owner-occupied Commercial Real Estate
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         348
Allowance for loan losses 326   326    
Noncovered PCI Loans | Non-owner Occupied Commercial Real Estate
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         359
Allowance for loan losses 334   334    
Noncovered PCI Loans | One-to-four Family Residential
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         216
Allowance for loan losses 205   205    
Noncovered PCI Loans | Real Estate Construction and Land Development: One-to-four Family Residential
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         291
Allowance for loan losses 258   258    
Noncovered PCI Loans | Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         98
Allowance for loan losses 86   86    
Noncovered PCI Loans | Consumer
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         638
Allowance for loan losses 609   609    
Noncovered PCI Loans | Unallocated
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         0
Allowance for loan losses 0   0    
Covered PCI Loans
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         5,398
Allowance for loan losses 5,389   5,389    
Covered PCI Loans | Commercial and Industrial
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         1,094
Allowance for loan losses 766   766    
Covered PCI Loans | Owner-occupied Commercial Real Estate
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         998
Allowance for loan losses 1,177   1,177    
Covered PCI Loans | Non-owner Occupied Commercial Real Estate
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         2,073
Allowance for loan losses 2,122   2,122    
Covered PCI Loans | One-to-four Family Residential
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         270
Allowance for loan losses 354   354    
Covered PCI Loans | Real Estate Construction and Land Development: One-to-four Family Residential
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         789
Allowance for loan losses 753   753    
Covered PCI Loans | Real Estate Construction and Land Development: Five or More Family Residential and Commercial Properties
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         0
Allowance for loan losses 0   0    
Covered PCI Loans | Consumer
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         174
Allowance for loan losses 217   217    
Covered PCI Loans | Unallocated
         
Schedule of allowance for loan losses on the basis of impairment method          
Collectively evaluated for impairment         0
Allowance for loan losses $ 0   $ 0