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Loans and Loans Held for Sale - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income on loans and leases receivable   $ 5,300 $ 5,200
Net unamortized discount related to purchase accounting fair value adjustments   3,300 2,800
Loans receivable, net   $ 5,949,019 $ 5,765,934
Number of commitments to lend additional funds | loan   6  
Commitment to lend additional funds   $ 11,600  
Number of TDRs returned back to accruing status | loan   0 1
Financial receivable trouble debt restructuring reclassified to accruing trouble debt restructuring status     $ 2,000
Minimum period of loan payment defaults following restructure for TDRs to be in default   90 days  
Number of TDRs defaulted that were restructured within the last 12 months prior to defaulting | loan   4 0
Financial receivable defaulted trouble debt restructuring loans restructured within twelve months prior to defaulting   $ 4,400  
Increase in nonperforming assets   24,800  
Nonperforming assets   49,165 $ 24,407
Increase in other real estate   $ 2,600  
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of commercial loans in total portfolio loans   79.00% 78.00%
Loans recorded investment   $ 4,672,445 $ 4,503,594
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   2,921,832 2,685,994
Commercial real estate | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans recorded investment   2,921,832 2,685,994
Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   $ 1,493,416 1,433,266
Number of nonperforming, impaired loans paid off during the period | loan   3  
Balance of nonperforming, impaired loans paid off during the period   $ 23,600  
Commercial and industrial | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans recorded investment   1,493,416 1,433,266
Commercial construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   257,197 384,334
Commercial construction | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans recorded investment   257,197 384,334
Residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   $ 726,679 $ 698,774
CRE and Commercial Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Out-of-state exposure of combined portfolio   5.40% 5.20%
CRE and Commercial Construction | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans recorded investment   $ 3,200,000 $ 3,100,000
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   0.00% 0.00%
Maximum concentration of commercial real estate and commercial construction portfolio in loans   14.00% 14.00%
Percentage of total loans out-of-state excluding contiguous states   2.90% 2.80%
Integrity Bancshares, Inc.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   $ 312,300 $ 386,600
Integrity Bancshares, Inc. | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   180,400 208,500
Integrity Bancshares, Inc. | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   73,400 92,200
Integrity Bancshares, Inc. | Commercial construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   6,600 11,100
Integrity Bancshares, Inc. | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   38,700 57,500
Integrity Bancshares, Inc. | Home Equity, Installment and Other Consumer Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   $ 13,200 $ 17,300
Land      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Increase in other real estate $ 2,500