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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 ($)
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment $ 72,399,000   $ 63,147,000      
Individually evaluated for impairment 2,328,000   2,198,000      
Total allowance for loan losses 75,670,000 $ 70,204,000 67,240,000 $ 61,944,000 $ 58,350,000 $ 58,980,000
Collectively evaluated for impairment 16,926,358,000   15,531,482,000      
Individually evaluated for impairment 80,832,000   58,979,000      
Loans 17,042,853,000   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] 468,000   573,000      
Loans acquired with deteriorated credit quality 35,663,000   42,655,000      
Commercial real estate - mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 23,394,000   20,753,000      
Individually evaluated for impairment 1,092,000   95,000      
Total allowance for loan losses 24,848,000 22,688,000 21,188,000 16,002,000 14,168,000 13,655,000
Collectively evaluated for impairment 6,965,272,000   6,630,593,000      
Individually evaluated for impairment 39,268,000   18,214,000      
Loans 7,024,639,000   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] 362,000   340,000      
Loans acquired with deteriorated credit quality 20,099,000   20,803,000      
Consumer real estate - mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 5,323,000   4,460,000      
Individually evaluated for impairment 433,000   410,000      
Total allowance for loan losses 5,853,000 5,100,000 5,031,000 7,835,000 7,219,000 6,564,000
Collectively evaluated for impairment 2,671,404,000   2,534,996,000      
Individually evaluated for impairment 17,593,000   12,172,000      
Loans 2,699,399,000   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] 97,000   161,000      
Loans acquired with deteriorated credit quality 10,402,000   14,046,000      
Construction and land development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 10,944,000   8,879,000      
Individually evaluated for impairment 33,000   66,000      
Total allowance for loan losses 10,984,000 10,116,000 8,962,000 5,126,000 4,441,000 3,624,000
Collectively evaluated for impairment 2,127,279,000   1,896,553,000      
Individually evaluated for impairment 1,737,000   5,167,000      
Loans 2,133,646,000   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] 7,000   17,000      
Loans acquired with deteriorated credit quality 4,630,000   6,568,000      
Commercial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 27,748,000   23,181,000      
Individually evaluated for impairment 588,000   1,627,000      
Total allowance for loan losses 28,338,000 26,648,000 24,863,000 24,235,000 22,912,000 24,743,000
Collectively evaluated for impairment 4,799,396,000   4,116,677,000      
Individually evaluated for impairment 21,371,000   23,426,000      
Loans 4,821,299,000   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 532,000   1,238,000      
Consumer and other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 4,990,000   5,874,000      
Individually evaluated for impairment 182,000   0      
Total allowance for loan losses 5,172,000 5,476,000 5,874,000 7,549,000 8,477,000 9,520,000
Collectively evaluated for impairment 363,007,000   352,663,000      
Individually evaluated for impairment 863,000   0      
Loans 363,870,000   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 0   0      
Unallocated            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment        
Individually evaluated for impairment        
Total allowance for loan losses 475,000 $ 176,000 1,322,000 $ 1,197,000 $ 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.