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Non-Covered Loans and Allowance for Non-Covered Loan Losses (Details 7) (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
Changes in the allowance for loan losses          
Balance, beginning of period     $ 33,241    
Provision for loan losses 4,033 10,658 12,808 34,952  
Balance, end of period 39,027   39,027    
Loan portfolio distributed by portfolio segment and impairment methodology          
Total loans 3,768,843   3,768,843   3,514,646
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Total loans 39,027   39,027    
Originated loans
         
Allowance for loan losses          
Rolling period considered for average net loss rate to calculate historical loss factors     3 years    
Weighted average loss rate for recent four quarters (as a percent)     120.00%    
Weighted average loss rate for oldest four quarters (as a percent)     80.00%    
Originated loans | Minimum
         
Loan portfolio distributed by portfolio segment and impairment methodology          
Loans individually evaluated for impairment 500   500    
Non-covered loans
         
Changes in the allowance for loan losses          
Balance, beginning of period 36,431 26,237 33,241 3,409  
Provision for loan losses 4,186 10,658 9,657 34,952  
Loans charged off (2,120) (3,800) (6,082) (8,061)  
Recoveries on charged off loans 530 85 2,211 2,880  
Balance, end of period 39,027 33,180 39,027 33,180  
Loan portfolio distributed by portfolio segment and impairment methodology          
Loans individually evaluated for impairment 10,587   10,587   2,758
Loans collectively evaluated for impairment 3,704,873   3,704,873   3,411,496
Total loans 3,768,843   3,768,843   3,514,646
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Loans individually evaluated for impairment 421   421   421
Loans collectively evaluated for impairment 33,318   33,318   29,683
Total loans 39,027 33,180 39,027 33,180  
Non-covered loans | Commercial and Industrial
         
Changes in the allowance for loan losses          
Balance, beginning of period 18,062 13,806 16,865 1,845  
Provision for loan losses 2,302 8,879 5,876 22,519  
Loans charged off (1,976) (3,220) (5,707) (7,314)  
Recoveries on charged off loans 457 42 1,811 2,457  
Balance, end of period 18,845 19,507 18,845 19,507  
Loan portfolio distributed by portfolio segment and impairment methodology          
Loans individually evaluated for impairment 8,354   8,354   2,273
Loans collectively evaluated for impairment 1,652,518   1,652,518   1,598,177
Total loans 1,677,389   1,677,389   1,637,266
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Loans individually evaluated for impairment 421   421   421
Loans collectively evaluated for impairment 15,439   15,439   13,724
Total loans 18,845 19,507 18,845 19,507  
Non-covered loans | Real estate
         
Changes in the allowance for loan losses          
Balance, beginning of period 9,998 5,339 8,331 977  
Provision for loan losses 1,064 1,776 2,689 6,033  
Loans charged off (28) (53) (100) (149)  
Recoveries on charged off loans 31 26 145 227  
Balance, end of period 11,065 7,088 11,065 7,088  
Loan portfolio distributed by portfolio segment and impairment methodology          
Loans individually evaluated for impairment 1,450   1,450   373
Loans collectively evaluated for impairment 1,580,755   1,580,755   1,417,630
Total loans 1,606,718   1,606,718   1,457,253
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Loans collectively evaluated for impairment 9,347   9,347   7,953
Total loans 11,065 7,088 11,065 7,088  
Non-covered loans | Construction and Land Development
         
Changes in the allowance for loan losses          
Balance, beginning of period 8,086 7,050 7,957 582  
Provision for loan losses 395 6 361 6,323  
Loans charged off   (524)   (524)  
Recoveries on charged off loans 18 2 181 153  
Balance, end of period 8,499 6,534 8,499 6,534  
Loan portfolio distributed by portfolio segment and impairment methodology          
Loans individually evaluated for impairment 783   783   112
Loans collectively evaluated for impairment 418,735   418,735   344,622
Total loans 429,216   429,216   364,551
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Loans collectively evaluated for impairment 8,335   8,335   7,918
Total loans 8,499 6,534 8,499 6,534  
Non-covered loans | Consumer
         
Changes in the allowance for loan losses          
Balance, beginning of period 285 42 88 5  
Provision for loan losses 425 (3) 731 77  
Loans charged off (116) (3) (275) (74)  
Recoveries on charged off loans 24 15 74 43  
Balance, end of period 618 51 618 51  
Loan portfolio distributed by portfolio segment and impairment methodology          
Loans collectively evaluated for impairment 52,865   52,865   51,067
Total loans 55,520   55,520   55,576
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Loans collectively evaluated for impairment 197   197   88
Total loans 618 51 618 51  
Non-covered loans | Acquired loans without credit impairment
         
Allowance for loan losses          
Additional allowance recorded when allowance is less than remaining fair value of discount     0    
Non-covered loans | PCI loans
         
Changes in the allowance for loan losses          
Balance, beginning of period         3,137
Balance, end of period 5,288   5,288   3,137
Loan portfolio distributed by portfolio segment and impairment methodology          
Total loans 53,383   53,383   100,392
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Total loans 5,288   5,288   3,137
Non-covered loans | PCI loans | Commercial and Industrial
         
Changes in the allowance for loan losses          
Balance, beginning of period         2,720
Balance, end of period 2,985   2,985   2,720
Loan portfolio distributed by portfolio segment and impairment methodology          
Total loans 16,517   16,517   36,816
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Total loans 2,985   2,985   2,720
Non-covered loans | PCI loans | Real estate
         
Changes in the allowance for loan losses          
Balance, beginning of period         378
Balance, end of period 1,718   1,718   378
Loan portfolio distributed by portfolio segment and impairment methodology          
Total loans 24,513   24,513   39,250
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Total loans 1,718   1,718   378
Non-covered loans | PCI loans | Construction and Land Development
         
Changes in the allowance for loan losses          
Balance, beginning of period         39
Balance, end of period 164   164   39
Loan portfolio distributed by portfolio segment and impairment methodology          
Total loans 9,698   9,698   19,817
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Total loans 164   164   39
Non-covered loans | PCI loans | Consumer
         
Changes in the allowance for loan losses          
Balance, end of period 421   421    
Loan portfolio distributed by portfolio segment and impairment methodology          
Total loans 2,655   2,655   4,509
Allowance for loan losses distributed by portfolio segment and impairment methodology          
Total loans 421   421    
Non-covered loans | Acquired loans
         
Allowance for loan losses          
Carryover of the allowance for loan losses recorded     $ 0