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Loans and Loans Held for Sale - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
contract
tdr
loan
Jun. 30, 2016
tdr
loan
Jun. 30, 2017
USD ($)
contract
tdr
loan
Jun. 30, 2016
USD ($)
tdr
loan
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, net of unearned income $ 4,500   $ 4,500   $ 5,200
Loans, net of discount related to purchase accounting adjustments 4,900   4,900   7,100
Loans receivable, net $ 5,780,939   5,780,939   $ 5,615,212
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)         7.00%
Increase in loans held for sale during the period     $ 19,300    
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status     6 months    
Number of troubled debt restructuring loans returned back to accruing status | tdr 1 0 1 0  
Amount of troubled debt restructuring loans returned to accruing status $ 2,000   $ 2,000    
Number of loans modified not considered to be troubled debt restructuring | contract     12    
Loans modified not considered to be troubled debt restructuring     $ 11,800    
Commitment to lend additional funds on troubled debt restructuring $ 600   $ 600    
Minimum period of loan payment defaults following restructure for TDRs to be in default     90 days    
Number of troubled debt restructuring loans that defaulted | loan 0 0 0    
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of commercial loans in total portfolio loans 78.00%   78.00%   78.00%
Commercial Loans $ 4,492,679   $ 4,492,679   $ 4,355,395
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of) 7.00%   7.00%   7.00%
Increase in loans held for sale during the period     $ 18,000    
Number of loans held-for-sale sold during period | contract     3    
Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net $ 2,664,642   $ 2,664,642   $ 2,498,476
Number of loans modified not considered to be troubled debt restructuring | contract     3    
Loans modified not considered to be troubled debt restructuring     $ 1,400    
Commercial Real Estate | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial Loans 2,664,642   2,664,642   2,498,476
Commercial and Industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net $ 1,401,283   $ 1,401,283   1,401,035
Number of loans modified not considered to be troubled debt restructuring | contract 2   9    
Loans modified not considered to be troubled debt restructuring $ 3,900   $ 10,400    
Commercial and Industrial | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial Loans 1,401,283   1,401,283   1,401,035
Commercial Construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net 426,754   426,754   455,884
Number of troubled debt restructuring loans that defaulted | loan       1  
Recorded investment of troubled debt restructuring loans that defaulted       $ 600  
Commercial Construction | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial Loans 426,754   426,754   455,884
Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net 706,143   706,143   701,982
Commercial Real Estate and Commercial Construction | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial Loans $ 3,100,000   $ 3,100,000   $ 3,000,000
Combined percentage of commercial real estate and commercial construction in total commercial loans 69.00%   69.00%   68.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans 54.00%   54.00%   53.00%
Concentration risk percentage of commercial real estate and commercial construction     0.00%   0.00%
Out of market exposure of combined portfolio (percent) 5.30%   5.30%   5.20%
Percentage of total loans out-of-state excluding contiguous states 2.80%   2.80%   2.70%
Integrity Bancshares, Inc.          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net $ 443,000   $ 443,000   $ 543,000
Decrease in acquired loans during the period        
Integrity Bancshares, Inc. | Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net 231,000   231,000   273,000
Integrity Bancshares, Inc. | Commercial and Industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net 109,000   109,000   141,000
Integrity Bancshares, Inc. | Commercial Construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net 18,700   18,700   33,000
Integrity Bancshares, Inc. | Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net 64,400   64,400   74,000
Integrity Bancshares, Inc. | Home Equity, Installment and Other Consumer Construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net $ 19,900   $ 19,900   $ 22,000