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Loans - Schedule of Recorded Investment in Past Due Loans by Class (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans and Leases Receivable Recorded Investment, Past Due      
Loans held for investment $ 7,567,720 $ 5,416,750  
Mortgage loans held for sale 46,635 61,794  
Total loans 7,614,355 5,478,544  
Interest income on non-accrual loans if accrued 3,500 3,400 $ 3,200
Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 3,700 8,700  
Current Loans 2,792,400 1,799,500  
Non-accrual Loans 26,800 26,200  
Loans held for investment 2,822,900 1,834,400  
Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 7,900 1,300  
Current Loans 337,800 202,200  
Non-accrual Loans 3,000 5,000  
Loans held for investment 348,700 208,500  
Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2,100 1,200  
Current Loans 236,400 146,200  
Non-accrual Loans 1,700 500  
Loans held for investment 240,200 147,900  
Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Current Loans 115,600 124,800  
Non-accrual Loans 3,800 800  
Loans held for investment 119,400 125,600  
Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 10,000 2,500  
Current Loans 689,800 473,200  
Non-accrual Loans 8,500 6,300  
Loans held for investment 708,300 482,000  
Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 15,100 6,000  
Current Loans 1,464,100 1,015,000  
Non-accrual Loans 8,200 6,400  
Loans held for investment 1,487,400 1,027,400  
Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 500 600  
Current Loans 154,300 165,300  
Non-accrual Loans 3,400 4,300  
Loans held for investment 158,200 170,200  
Total real estate loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 29,300 17,800  
Current Loans 5,100,600 3,453,000  
Non-accrual Loans 46,900 43,200  
Loans held for investment 5,176,800 3,514,000  
Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 10,300 11,400  
Current Loans 772,600 740,200  
Non-accrual Loans 1,800 800  
Loans held for investment 784,700 752,400  
Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2,200 1,700  
Current Loans 172,600 146,100  
Non-accrual Loans 300 300  
Loans held for investment 175,100 148,100  
Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2,200 1,400  
Current Loans 72,400 68,400  
Non-accrual Loans 0 0  
Loans held for investment 74,600 69,800  
Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 14,700 14,500  
Current Loans 1,017,600 954,700  
Non-accrual Loans 2,100 1,100  
Loans held for investment 1,034,400 970,300  
Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 6,300 4,600  
Current Loans 1,189,500 767,900  
Non-accrual Loans 19,600 25,400  
Loans held for investment 1,215,400 797,900  
Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1,900 1,900  
Current Loans 133,500 128,000  
Non-accrual Loans 800 3,000  
Loans held for investment 136,200 132,900  
Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 300  
Current Loans 4,900 1,300  
Non-accrual Loans 0 0  
Loans held for investment 4,900 1,600  
Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 52,200 39,100  
Current Loans 7,446,100 5,304,900  
Non-accrual Loans 69,400 72,700  
Loans held for investment 7,567,700 5,416,700  
Mortgage loans originated for sale      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Current Loans 46,600 61,800  
Non-accrual Loans 0 0  
Mortgage loans held for sale 46,600    
Total loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 52,200 39,100  
Current Loans 7,492,700 5,366,700  
Non-accrual Loans 69,400 72,700  
Total loans 7,614,300 5,478,500  
Financing Receivables, 30 to 59 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2,900 7,300  
Financing Receivables, 30 to 59 Days Past Due | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 7,300 600  
Financing Receivables, 30 to 59 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2,100 900  
Financing Receivables, 30 to 59 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, 30 to 59 Days Past Due | Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 9,400 1,500  
Financing Receivables, 30 to 59 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 13,300 4,000  
Financing Receivables, 30 to 59 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 300 300  
Financing Receivables, 30 to 59 Days Past Due | Total real estate loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 25,900 13,100  
Financing Receivables, 30 to 59 Days Past Due | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 7,800 8,400  
Financing Receivables, 30 to 59 Days Past Due | Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1,600 1,300  
Financing Receivables, 30 to 59 Days Past Due | Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 900 500  
Financing Receivables, 30 to 59 Days Past Due | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 10,300 10,200  
Financing Receivables, 30 to 59 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 3,900 3,200  
Financing Receivables, 30 to 59 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1,800 1,500  
Financing Receivables, 30 to 59 Days Past Due | Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, 30 to 59 Days Past Due | Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 41,900 28,000  
Financing Receivables, 30 to 59 Days Past Due | Mortgage loans originated for sale      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, 30 to 59 Days Past Due | Total loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 41,900 28,000  
Financing Receivables, 60 to 89 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 500 1,100  
Financing Receivables, 60 to 89 Days Past Due | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 300 400  
Financing Receivables, 60 to 89 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 300  
Financing Receivables, 60 to 89 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due | Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 300 700  
Financing Receivables, 60 to 89 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1,400 1,300  
Financing Receivables, 60 to 89 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 300  
Financing Receivables, 60 to 89 Days Past Due | Total real estate loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2,200 3,400  
Financing Receivables, 60 to 89 Days Past Due | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2,100 2,300  
Financing Receivables, 60 to 89 Days Past Due | Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 500 200  
Financing Receivables, 60 to 89 Days Past Due | Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 600 300  
Financing Receivables, 60 to 89 Days Past Due | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 3,200 2,800  
Financing Receivables, 60 to 89 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1,700 700  
Financing Receivables, 60 to 89 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 100 400  
Financing Receivables, 60 to 89 Days Past Due | Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due | Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 7,200 7,300  
Financing Receivables, 60 to 89 Days Past Due | Mortgage loans originated for sale      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due | Total loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 7,200 7,300  
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 300 300  
Financing Receivables, Equal to Greater than 90 Days Past Due | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 300 300  
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due | Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 300 300  
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 400 700  
Financing Receivables, Equal to Greater than 90 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 200 0  
Financing Receivables, Equal to Greater than 90 Days Past Due | Total real estate loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1,200 1,300  
Financing Receivables, Equal to Greater than 90 Days Past Due | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 400 700  
Financing Receivables, Equal to Greater than 90 Days Past Due | Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 100 200  
Financing Receivables, Equal to Greater than 90 Days Past Due | Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 700 600  
Financing Receivables, Equal to Greater than 90 Days Past Due | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1,200 1,500  
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 700 700  
Financing Receivables, Equal to Greater than 90 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due | Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 300  
Financing Receivables, Equal to Greater than 90 Days Past Due | Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 3,100 3,800  
Financing Receivables, Equal to Greater than 90 Days Past Due | Mortgage loans originated for sale      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due | Total loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due $ 3,100 $ 3,800