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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Amortized intangible assets [Abstract]      
Gross carrying value [1] $ 3,545   $ 3,516
Accumulated amortization [1] (1,689)   (1,563)
Net carrying value [1] 1,856   1,953
Unamortized intangible assets [Abstract]      
Goodwill 23,296   23,296
Actual and Estimated Future Amortization Expense [Abstract]      
Amortization expense 126 $ 123  
Estimated Amortization Expense [Abstract]      
Remaining 2018 354    
2019 412    
2020 317    
2021 256    
2022 200    
MSRs [Member]      
Amortized intangible assets [Abstract]      
Gross carrying value [1] 1,634   1,605
Accumulated amortization [1] (961)   (912)
Net carrying value [1] 673   693
Actual and Estimated Future Amortization Expense [Abstract]      
Amortization expense 49 47  
Estimated Amortization Expense [Abstract]      
Remaining 2018 135    
2019 153    
2020 120    
2021 91    
2022 67    
Core Deposit Intangibles [Member]      
Amortized intangible assets [Abstract]      
Gross carrying value [1] 1,786   1,786
Accumulated amortization [1] (655)   (586)
Net carrying value [1] 1,131   1,200
Actual and Estimated Future Amortization Expense [Abstract]      
Amortization expense 69 68  
Estimated Amortization Expense [Abstract]      
Remaining 2018 196    
2019 230    
2020 197    
2021 165    
2022 133    
Covenant not to Compete [Member]      
Amortized intangible assets [Abstract]      
Gross carrying value [1] 125   125
Accumulated amortization [1] (73)   (65)
Net carrying value [1] 52   $ 60
Actual and Estimated Future Amortization Expense [Abstract]      
Amortization expense 8 $ 8  
Estimated Amortization Expense [Abstract]      
Remaining 2018 23    
2019 29    
2020 0    
2021 0    
2022 $ 0    
[1] Excludes fully amortized intangible assets.