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Loans and Allowance for Loan Losses - Allowance for Credit Losses (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance $ 67,240,000 $ 58,980,000
Charged-off loans (8,669,000) (5,162,000)
Recovery of previously charged-off loans 4,702,000 881,000
Provision for loan losses 6,931,000 3,651,000
Ending Balance 70,204,000 58,350,000
Loans acquired with deteriorated credit quality (1)    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance [1] 573,000  
Ending Balance [1] 138,000  
Commercial real estate - mortgage    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance 21,188,000 13,655,000
Charged-off loans (728,000) 0
Recovery of previously charged-off loans 1,396,000 6,000
Provision for loan losses 832,000 507,000
Ending Balance 22,688,000 14,168,000
Commercial real estate - mortgage | Loans acquired with deteriorated credit quality (1)    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance [1] 340,000  
Ending Balance [1] 107,000  
Consumer real estate - mortgage    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance 5,031,000 6,564,000
Charged-off loans (336,000) (61,000)
Recovery of previously charged-off loans 666,000 170,000
Provision for loan losses (261,000) 546,000
Ending Balance 5,100,000 7,219,000
Consumer real estate - mortgage | Loans acquired with deteriorated credit quality (1)    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance [1] 161,000  
Ending Balance [1] 27,000  
Construction and land development    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance 8,962,000 3,624,000
Charged-off loans (2,000) 0
Recovery of previously charged-off loans 565,000 33,000
Provision for loan losses 591,000 784,000
Ending Balance 10,116,000 4,441,000
Construction and land development | Loans acquired with deteriorated credit quality (1)    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance [1] 17,000  
Ending Balance [1] 2,000  
Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance 24,863,000 24,743,000
Charged-off loans (2,540,000) (1,158,000)
Recovery of previously charged-off loans 888,000 140,000
Provision for loan losses 3,437,000 (813,000)
Ending Balance 26,648,000 22,912,000
Commercial and industrial | Loans acquired with deteriorated credit quality (1)    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance [1] 55,000  
Ending Balance [1] 2,000  
Consumer and other    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance 5,874,000 9,520,000
Charged-off loans (5,063,000) (3,943,000)
Recovery of previously charged-off loans 1,187,000 532,000
Provision for loan losses 3,478,000 2,368,000
Ending Balance 5,476,000 8,477,000
Consumer and other | Loans acquired with deteriorated credit quality (1)    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance [1] 0  
Ending Balance [1] 0  
Unallocated    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance 1,322,000 874,000
Charged-off loans 0 0
Recovery of previously charged-off loans 0 0
Provision for loan losses (1,146,000) 259,000
Ending Balance 176,000 $ 1,133,000
Unallocated | Loans acquired with deteriorated credit quality (1)    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning Balance [1]  
Ending Balance [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.