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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Amortized Cost: Due after one year through five years $ 15,865  
Amortized Cost: Due after five years through ten years 20,553  
Amortized Cost: Due after ten years 34,212  
Amortized Cost: Sub Total 70,630  
Fair Value: Due after one year through five years 15,759  
Fair Value: Due after five years through ten years 20,193  
Fair Value: Due after ten years 29,499  
Available For Sale Debt Maturities Fair Value Sub Total 65,451  
Available-for-sale Securities, Amortized Cost Basis 155,419 $ 149,561
Available-for-sale Securities 149,160 140,000
Amortized Cost: Due after five years through ten years, Held to maturity 15,841  
Amortized Cost: Due after ten years, Held to maturity 8,510  
Amortized Cost: Total, Held to maturity 24,351  
Fair Value: Due after five years through ten years, Held to maturity 16,450  
Fair Value: Due after ten years, Held to maturity 9,836  
Fair Value: Total, Held to maturity 26,286  
Held-to-maturity securities 95,975 97,169
Held-to-maturity securities, fair value 98,183 97,981
Residential mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity securities 50,019 50,384
Held-to-maturity securities, fair value 49,957 50,265
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 42,417 52,978
Available-for-sale Securities 41,823 52,222
Held-to-maturity securities 17,364 17,584
Held-to-maturity securities, fair value 17,749 17,832
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 42,372 19,953
Available-for-sale Securities 41,886 19,567
Held-to-maturity securities 4,241 4,833
Held-to-maturity securities, fair value $ 4,191 $ 4,684