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Investment Securities (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Amortized Cost: Due after one year through five years $ 10,667  
Amortized Cost: Due after five years through ten years 19,576  
Amortized Cost: Due after ten years 46,387  
Amortized Cost, Single Maturity Date, Total 76,630  
Fair Value: Due after one year through five years 10,524  
Fair Value: Due after five years through ten years 19,027  
Fair Value: Due after ten years 38,660  
Fair Value: Single Maturity Date, Total 68,211  
Available for sale debt maturities fair value sub total 140,000  
Available For Sale Debt Maturities Amortized Cost Total 149,561  
Available-for-sale Securities, Amortized Cost Basis 149,561 $ 177,070
Available-for-sale Securities 140,000 170,232
Amortized Cost: Due after five years through ten years, Held to maturity 15,738  
Amortized Cost: Due after ten years, Held to maturity 8,630  
Amortized Cost: Total, Held to maturity 24,368  
Fair Value: Due after five years through ten years, Held to maturity 16,250  
Fair Value: Due after ten years, Held to maturity 8,950  
Fair Value: Total, Held to maturity 25,200  
Held-to-maturity Securities 97,169 105,560
Held-to-maturity Securities, Fair Value 97,981 106,742
Residential mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Amortized Cost Basis   14,285
Available-for-sale Securities   14,170
Held-to-maturity Securities 50,384 53,734
Held-to-maturity Securities, Fair Value 50,265 53,912
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Amortized Cost: without Single Maturity Date 52,978  
Fair Value: without Single Maturity Date 52,222  
Available-for-sale Securities, Amortized Cost Basis 52,978 43,780
Available-for-sale Securities 52,222 43,636
Held-to-maturity Securities 17,584 18,078
Held-to-maturity Securities, Fair Value 17,832 18,232
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Amortized Cost: without Single Maturity Date 19,953  
Fair Value: without Single Maturity Date 19,567  
Available-for-sale Securities, Amortized Cost Basis 19,953 9,690
Available-for-sale Securities 19,567 9,610
Held-to-maturity Securities 4,833 6,419
Held-to-maturity Securities, Fair Value $ 4,684 $ 6,297