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Loans and Loans Held for Sale - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 03, 2017
USD ($)
contract
Mar. 31, 2017
USD ($)
contract
loan
Mar. 31, 2016
USD ($)
loan
Dec. 31, 2015
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, net of unearned income   $ 5,600     $ 5,200
Loans, net of discount related to purchase accounting adjustments   6,000     7,100
Loans receivable, net   5,761,181     $ 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   $ 10,600      
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status   6 months      
Commitment to lend additional funds on troubled debt restructuring   $ 500      
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      
Subsequent Event          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase in loans held for sale during the period $ 11,300        
Number of loans held-for-sale sold during period | contract 2        
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of commercial loans in total portfolio loans   78.00%      
Commercial Loans   $ 4,492,232     $ 4,355,395
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)   7.00%     7.00%
Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   $ 2,614,724     $ 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   $ 1,500      
Commercial Real Estate | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial Loans   2,614,724     2,498,476
Commercial And Industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   $ 1,422,297     1,401,035
Number of loans modified not considered to be troubled debt restructuring | contract   7      
Loans modified not considered to be troubled debt restructuring   $ 6,500      
Commercial And Industrial | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial Loans   1,422,297     1,401,035
Commercial Construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   455,211     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   455,211     455,884
Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   700,610     701,982
Commercial Real Estate and Commercial Construction | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial Loans   $ 3,100,000     $ 3,000,000
Combined percentage of commercial real estate and commercial construction in total commercial loans   68.00%     68.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans   53.00%     53.00%
Concentration risk percentage of commercial real estate and commercial construction   0.00%   0.00%  
Out of market exposure of combined portfolio (percent)   5.20%     5.20%
Percentage of total loans out-of-state excluding contiguous states   2.80%     2.70%
Integrity Bancshares, Inc.          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   $ 488,000     $ 543,000
Integrity Bancshares, Inc. | Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   251,000     273,000
Integrity Bancshares, Inc. | Commercial And Industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   118,000     141,000
Integrity Bancshares, Inc. | Commercial Construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   29,200     33,000
Integrity Bancshares, Inc. | Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   68,500     74,000
Integrity Bancshares, Inc. | Home Equity, Installment and Other Consumer Construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, net   $ 21,300     $ 22,000