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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Amortized Cost: Due after one year through five years $ 10,657  
Amortized Cost: Due after five years through ten years 18,268  
Amortized Cost: Due after ten years 34,551  
Amortized Cost: Sub Total 63,476  
Fair Value: Due after one year through five years 10,544  
Fair Value: Due after five years through ten years 17,872  
Fair Value: Due after ten years 29,418  
Available For Sale Debt Maturities Fair Value Sub Total 57,834  
Available-for-sale Securities, Amortized Cost Basis 135,746 $ 149,561
Available-for-sale Securities 129,198 140,000
Amortized Cost: Due after five years through ten years, Held to maturity 15,806  
Amortized Cost: Due after ten years, Held to maturity 8,510  
Amortized Cost: Total, Held to maturity 24,316  
Fair Value: Due after five years through ten years, Held to maturity 16,380  
Fair Value: Due after ten years, Held to maturity 9,802  
Fair Value: Total, Held to maturity 26,182  
Held-to-maturity securities 98,354 97,169
Held-to-maturity securities, fair value 100,365 97,981
Residential mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity securities 52,064 50,384
Held-to-maturity securities, fair value 51,860 50,265
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 42,854 52,978
Available-for-sale Securities 42,343 52,222
Held-to-maturity securities 17,437 17,584
Held-to-maturity securities, fair value 17,847 17,832
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 29,416 19,953
Available-for-sale Securities 29,021 19,567
Held-to-maturity securities 4,537 4,833
Held-to-maturity securities, fair value $ 4,476 $ 4,684