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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Amortized Cost: Due after one year through five years $ 16,943  
Amortized Cost: Due after five years through ten years 19,020  
Amortized Cost: Due after ten years 33,482  
Amortized Cost: Sub Total 69,445  
Fair Value: Due after one year through five years 16,534  
Fair Value: Due after five years through ten years 18,053  
Fair Value: Due after ten years 31,248  
Available For Sale Debt Maturities Fair Value Sub Total 65,835  
Available-for-sale Securities, Amortized Cost Basis 148,998 $ 153,552
Available-for-sale Securities 142,303 146,470
Amortized Cost: Due after five years through ten years, Held to maturity 15,946  
Amortized Cost: Due after ten years, Held to maturity 8,420  
Amortized Cost: Total, Held to maturity 24,366  
Fair Value: Due after five years through ten years, Held to maturity 15,934  
Fair Value: Due after ten years, Held to maturity 9,266  
Fair Value: Total, Held to maturity 25,200  
Held-to-maturity securities 90,295 93,632
Held-to-maturity securities, fair value 89,242 95,346
Residential mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity securities 45,297 47,771
Held-to-maturity securities, fair value 43,855 47,442
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 40,450 41,771
Available-for-sale Securities 38,843 40,891
Held-to-maturity securities 16,643 17,288
Held-to-maturity securities, fair value 16,416 17,518
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 39,103 41,298
Available-for-sale Securities 37,625 40,384
Held-to-maturity securities 3,989 4,187
Held-to-maturity securities, fair value $ 3,771 $ 4,118