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Loans and Allowance for Loan Losses - Allowance for Credit Losses (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning Balance $ 70,204,000 $ 58,350,000 $ 67,240,000 $ 58,980,000
Charged-off loans (6,698,000) (5,157,000) (15,367,000) (10,321,000)
Recovery of previously charged-off loans 2,762,000 1,939,000 7,464,000 2,822,000
Provision for loan losses 9,402,000 6,812,000 16,333,000 10,463,000
Ending Balance 75,670,000 61,944,000 75,670,000 61,944,000
Loans acquired with deteriorated credit quality (1)        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning Balance [1]     573,000  
Ending Balance [1] 468,000   468,000  
Commercial real estate - mortgage        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning Balance 22,688,000 14,168,000 21,188,000 13,655,000
Charged-off loans (234,000) (8,000) (962,000) (9,000)
Recovery of previously charged-off loans 58,000 9,000 1,454,000 15,000
Provision for loan losses 2,336,000 1,833,000 3,168,000 2,341,000
Ending Balance 24,848,000 16,002,000 24,848,000 16,002,000
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] 362,000   362,000  
Consumer real estate - mortgage        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning Balance 5,100,000 7,219,000 5,031,000 6,564,000
Charged-off loans (935,000) (206,000) (1,271,000) (268,000)
Recovery of previously charged-off loans 537,000 412,000 1,203,000 582,000
Provision for loan losses 1,151,000 410,000 890,000 957,000
Ending Balance 5,853,000 7,835,000 5,853,000 7,835,000
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] 97,000   97,000  
Construction and land development        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning Balance 10,116,000 4,441,000 8,962,000 3,624,000
Charged-off loans (10,000) 0 (12,000) 0
Recovery of previously charged-off loans 1,010,000 96,000 1,575,000 129,000
Provision for loan losses 132,000 589,000 459,000 1,373,000
Ending Balance 10,984,000 5,126,000 10,984,000 5,126,000
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] 7,000   7,000  
Commercial and industrial        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning Balance 26,648,000 22,912,000 24,863,000 24,743,000
Charged-off loans (1,724,000) (495,000) (4,264,000) (1,653,000)
Recovery of previously charged-off loans 567,000 560,000 1,455,000 702,000
Provision for loan losses 2,847,000 1,258,000 6,284,000 443,000
Ending Balance 28,338,000 24,235,000 28,338,000 24,235,000
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   2,000  
Consumer and other        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning Balance 5,476,000 8,477,000 5,874,000 9,520,000
Charged-off loans (3,795,000) (4,448,000) (8,858,000) (8,391,000)
Recovery of previously charged-off loans 590,000 862,000 1,777,000 1,394,000
Provision for loan losses 2,901,000 2,658,000 6,379,000 5,026,000
Ending Balance 5,172,000 7,549,000 5,172,000 7,549,000
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   0  
Unallocated        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning Balance 176,000 1,133,000 1,322,000 874,000
Charged-off loans 0 0 0 0
Recovery of previously charged-off loans 0 0 0 0
Provision for loan losses 299,000 64,000 847,000 323,000
Ending Balance 475,000 $ 1,197,000 475,000 $ 1,197,000
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.