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Investment Securities Carrying Value (Amortized Cost) and Fair Value by remaining period of contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
AFS Amortized Cost One through five years $ 999    
AFS Amortized Cost Five through ten years 32,553    
AFS Amortized Cost After ten years 81,457    
AFS Fair Value One through five years 1,045    
AFS Fair Value Five through ten years 32,807    
AFS Fair Value After ten years 82,199    
AFS Fair Value 116,051   85,106
AFS Weighted Average Rate One through five years 2.00%    
AFS Weighted Average Rate Five through ten years 1.51%    
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate 2.64%    
AFS Weighted Average Rate Total 2.31%    
Held-to-maturity securities, one through five years, fair value 9    
HTM Amortized Cost Five through ten years 9    
HTM Fair Value Five through ten years 179    
Held-to-maturity Securities, Debt Maturities, One Through Five Years, Weighted Average Rate 2.32%    
Held-to-Maturity Security Amortized Cost Five through Ten years 171    
HTM Fair Value After ten years 9,441    
HTM Weighted Average Rate Five through ten years 4.43%    
Held-to-Maturity Security Amortized Cost through Ten years 8,863    
HTM Weighted Average Rate After ten years 4.32%    
Held-to-maturity Securities, Fair Value 9,629 10,737  
HTM Weighted Average Rate Total 4.32%    
Available-for-sale Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
AFS Fair Value 116,051    
AFS Amortized Cost 115,009   84,740
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment 9,043   11,081
Held-to-maturity Securities, Fair Value $ 9,629   $ 11,774