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Securities (Narrative) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Asset backed securities pledged to secure certain deposits $ 39,500,000    
Asset backed securities pledged as collateral 2,000,000    
Amount 127,728,000   $ 121,234,000
Amortized cost, held to maturity 93,941,000   84,506,000
Amortized cost, available for sale     38,300,000
Other than temporary impairment charges 0 $ 0  
Held-to-maturity securities, debt maturities, fair value 94,665,000   84,915,000
Losses (gains) on sales of HTM investment securities 1,000 (16,000)  
Recognized net gain (loss) on sale of securities (1,000) 24,000  
Gains on sales of AFS investment securities   8,000  
Securities held to maturity (HTM), at amortized cost 94,665,000   84,915,000
Securities available for sale (AFS), at fair value 38,989,000   $ 41,939,000
Held-to-maturity securities sold $ 68,000    
Asset Backed Securities Issued By GSEs [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Percentage of asset backed securities in investment portfolio 99.00%   99.00%
Available for sale securities average life 3 years 10 months 28 days   3 years 7 months 28 days
Available for sale securities, average duration 3 years 7 months 24 days   3 years 4 months 28 days
Held to maturity securities average life 4 years 1 month 13 days   3 years 4 months 24 days
Held to maturity securities, average duration 3 years 10 months 10 days   3 years 2 months 16 days
Gross unrealized losses, available for sale $ 384,000   $ 830,000
Held-To-Maturity Securities [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Held-to-maturity securities, debt maturities, fair value 94,700,000   $ 84,900,000
Losses (gains) on sales of HTM investment securities   (16,000)  
Securities held to maturity (HTM), at amortized cost   3,200,000  
Held-To-Maturity Securities [Member] | Asset Backed Securities Issued By Others [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amount $ 1,200,000    
Held to maturity securities average life 3 years 10 months 21 days   4 years 3 months 7 days
Held to maturity securities, average duration 3 years 2 months 5 days   3 years 7 months 13 days
Amortized cost, held to maturity     $ 1,500,000
Held-to-maturity securities, debt maturities, fair value     1,300,000
Losses (gains) on sales of HTM investment securities $ 106,000   $ 112,000
Held-To-Maturity Securities [Member] | Asset Backed Securities Issued By GSEs [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Held to maturity securities average life 3 years 9 months 22 days   3 years 2 months 23 days
Held to maturity securities, average duration 3 years 6 months 18 days   3 years 4 days
Amortized cost, held to maturity $ 92,000,000   $ 82,200,000
Held-to-maturity securities, debt maturities, fair value     35,600,000
Gross unrealized gain (loss) on securities (379,000)   (625,000)
Available-For-Sale Securities [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amount   2,100,000  
Gains on sales of AFS investment securities   $ 8,000  
Securities available for sale (AFS), at fair value $ 39,000,000   $ 41,900,000
Available-For-Sale Securities [Member] | Asset Backed Securities Issued By GSEs [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Available for sale securities average life 4 years 2 months 27 days   3 years 9 months 7 days
Available for sale securities, average duration 3 years 10 months 28 days   3 years 5 months 16 days
Amortized cost, held to maturity $ 32,800,000    
Unrealized Loss [Member] | Held-To-Maturity Securities [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Held-to-maturity securities, debt maturities, fair value 25,800,000   $ 36,900,000
Unrealized Loss [Member] | Held-To-Maturity Securities [Member] | Mortgage-Backed Securities, Issued By Private Enterprises [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Held-to-maturity securities, debt maturities, fair value 24,700,000    
Unrealized Loss [Member] | Held-To-Maturity Securities [Member] | Mortgage Backed Securities Issued By Others [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Held-to-maturity securities, debt maturities, fair value 1,100,000    
Unrealized Loss [Member] | Available-For-Sale Securities [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Securities available for sale (AFS), at fair value $ 18,400,000   $ 27,200,000