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Segment Reporting (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting [Abstract]      
Number of reporting segments | segment 2    
Segment Reporting Information [Line Items]      
Net interest income and other income from external customers $ 17,274 $ 12,548  
Income before income taxes 6,038 3,548  
Total assets 1,611,015 1,241,725 $ 1,595,432
Capital expenditures 357 367  
Banking      
Segment Reporting Information [Line Items]      
Net interest income and other income from external customers 16,074 11,394  
Income before income taxes 5,818 3,438  
Total assets 1,601,028 1,232,035  
Capital expenditures 357 367  
Insurance      
Segment Reporting Information [Line Items]      
Net interest income and other income from external customers 1,200 1,154  
Income before income taxes 220 110  
Total assets 9,987 9,690  
Capital expenditures $ 0 $ 0  
Core deposit intangibles      
Segment Reporting Information [Line Items]      
Amortization period 10 years    
Minimum | Customer lists      
Segment Reporting Information [Line Items]      
Amortization period 8 years    
Maximum | Customer lists      
Segment Reporting Information [Line Items]      
Amortization period 13 years