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Fair Value - Fair Value Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available for sale securities:    
Available for sale securities, at fair value $ 217,870 $ 221,176
Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member]    
Available for sale securities:    
Available for sale securities, at fair value 1,820 1,920
Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value 1,820 1,920
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]    
Available for sale securities:    
Available for sale securities, at fair value 100,061 120,599
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value 100,061 120,599
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member]    
Available for sale securities:    
Available for sale securities, at fair value 103,489 85,863
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member] | Level 2 [Member]    
Available for sale securities:    
Available for sale securities, at fair value 103,489 85,863
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]    
Available for sale securities:    
Available for sale securities, at fair value 12,500 12,794
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] | Level 1 [Member]    
Available for sale securities:    
Available for sale securities, at fair value $ 12,500 $ 12,794