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Segment Reporting (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
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 $ 18,408 $ 13,359 $ 35,682 $ 25,907  
Income before income taxes 6,837 3,725 12,875 7,273  
Total assets 1,623,342 1,261,936 1,623,342 1,261,936 $ 1,595,432
Capital expenditures 298 436 655 803  
Banking          
Segment Reporting Information [Line Items]          
Net interest income and other income from external customers 16,706 11,821 32,780 23,215  
Income before income taxes 6,213 3,237 12,031 6,675  
Total assets 1,613,462 1,252,723 1,613,462 1,252,723  
Capital expenditures 257 436 614 803  
Insurance          
Segment Reporting Information [Line Items]          
Net interest income and other income from external customers 1,702 1,538 2,902 2,692  
Income before income taxes 624 488 844 598  
Total assets 9,880 9,213 9,880 9,213  
Capital expenditures $ 41 $ 0 $ 41 $ 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