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Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification and Impairment Evaluation Method (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment $ 67,224,000 $ 63,147,000    
Individually evaluated for impairment 2,666,000 2,198,000    
Total allowance for loan losses 70,204,000 67,240,000 $ 58,350,000 $ 58,980,000
Collectively evaluated for impairment 16,217,680,000 15,531,482,000    
Individually evaluated for impairment 69,466,000 58,979,000    
Loans 16,326,017,000 15,633,116,000    
Loans acquired with deteriorated credit quality (1)        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1] 138,000 573,000    
Loans acquired with deteriorated credit quality 38,871,000 42,655,000    
Commercial real estate - mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 21,817,000 20,753,000    
Individually evaluated for impairment 764,000 95,000    
Total allowance for loan losses 22,688,000 21,188,000 14,168,000 13,655,000
Collectively evaluated for impairment 6,751,222,000 6,630,593,000    
Individually evaluated for impairment 22,773,000 18,214,000    
Loans 6,794,288,000 6,669,610,000    
Commercial real estate - mortgage | Loans acquired with deteriorated credit quality (1)        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1] 107,000 340,000    
Loans acquired with deteriorated credit quality 20,293,000 20,803,000    
Consumer real estate - mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 4,804,000 4,460,000    
Individually evaluated for impairment 269,000 410,000    
Total allowance for loan losses 5,100,000 5,031,000 7,219,000 6,564,000
Collectively evaluated for impairment 2,555,400,000 2,534,996,000    
Individually evaluated for impairment 14,148,000 12,172,000    
Loans 2,580,766,000 2,561,214,000    
Consumer real estate - mortgage | Loans acquired with deteriorated credit quality (1)        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1] 27,000 161,000    
Loans acquired with deteriorated credit quality 11,218,000 14,046,000    
Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 10,103,000 8,879,000    
Individually evaluated for impairment 11,000 66,000    
Total allowance for loan losses 10,116,000 8,962,000 4,441,000 3,624,000
Collectively evaluated for impairment 2,088,919,000 1,896,553,000    
Individually evaluated for impairment 381,000 5,167,000    
Loans 2,095,875,000 1,908,288,000    
Construction and land development | Loans acquired with deteriorated credit quality (1)        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1] 2,000 17,000    
Loans acquired with deteriorated credit quality 6,575,000 6,568,000    
Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 25,234,000 23,181,000    
Individually evaluated for impairment 1,412,000 1,627,000    
Total allowance for loan losses 26,648,000 24,863,000 22,912,000 24,743,000
Collectively evaluated for impairment 4,458,719,000 4,116,677,000    
Individually evaluated for impairment 31,383,000 23,426,000    
Loans 4,490,886,000 4,141,341,000    
Commercial and industrial | Loans acquired with deteriorated credit quality (1)        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1] 2,000 55,000    
Loans acquired with deteriorated credit quality 784,000 1,238,000    
Consumer and other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 5,266,000 5,874,000    
Individually evaluated for impairment 210,000 0    
Total allowance for loan losses 5,476,000 5,874,000 8,477,000 9,520,000
Collectively evaluated for impairment 363,420,000 352,663,000    
Individually evaluated for impairment 781,000 0    
Loans 364,202,000 352,663,000    
Consumer and other | Loans acquired with deteriorated credit quality (1)        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1] 0 0    
Loans acquired with deteriorated credit quality 1,000 0    
Unallocated        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment    
Individually evaluated for impairment    
Total allowance for loan losses 176,000 1,322,000 $ 1,133,000 $ 874,000
Unallocated | Loans acquired with deteriorated credit quality (1)        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1]    
[1] (1) Loans acquired with deteriorated credit quality are recorded at fair value at the time of acquisition. An allowance for loan losses is recorded resulting from subsequent credit deterioration.