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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Amortized Cost: Due after one year through five years $ 15,858  
Amortized Cost: Due after five years through ten years 20,741  
Amortized Cost: Due after ten years 35,022  
Amortized Cost: Sub Total 71,621  
Fair Value: Due after one year through five years 15,497  
Fair Value: Due after five years through ten years 19,904  
Fair Value: Due after ten years 31,286  
Available For Sale Debt Maturities Fair Value Sub Total 66,687  
Available-for-sale Securities, Amortized Cost Basis 153,281 $ 153,552
Available-for-sale Securities 145,604 146,470
Amortized Cost: Due after five years through ten years, Held to maturity 15,911  
Amortized Cost: Due after ten years, Held to maturity 8,510  
Amortized Cost: Total, Held to maturity 24,421  
Fair Value: Due after five years through ten years, Held to maturity 16,027  
Fair Value: Due after ten years, Held to maturity 9,342  
Fair Value: Total, Held to maturity 25,369  
Held-to-maturity securities 91,878 93,632
Held-to-maturity securities, fair value 91,335 95,346
Residential mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity securities 46,312 47,771
Held-to-maturity securities, fair value 45,108 47,442
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 41,431 41,771
Available-for-sale Securities 40,028 40,891
Held-to-maturity securities 17,090 17,288
Held-to-maturity securities, fair value 16,990 17,518
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 40,229 41,298
Available-for-sale Securities 38,889 40,384
Held-to-maturity securities 4,055 4,187
Held-to-maturity securities, fair value $ 3,868 $ 4,118