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Investment Securities (Held-to-maturity Securities by Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investments [Abstract]      
Federal income tax rate 35.00% 34.30% 34.00%
Schedule of Held-to-maturity Securities [Line Items]      
Debt securities, maturing within 1 year, amortized cost $ 0    
Debt securities, maturing 1 to 5 years, amortized cost 0    
Debt securities, maturing 5 to 10 years, amortized cost 885    
Debt securities, maturing over 10 years, amortized cost 44,390    
Debt securities, total amortized cost 45,275 16,301  
Debt securities, maturing within 1 year, fair value 0    
Debt securities, maturing 1 to 5 years, fair value 0    
Debt securities, maturing 5 to 10 years, fair value 901    
Debt securities, maturing over 10 years, fair value 46,223    
Debt securities, total fair value 47,124    
Held-to-maturity securities, maturing within 1 year, average yield 0.00%    
Held-to-maturity securities, maturing 1 to 5 years, average yield 0.00%    
Held-to-maturity securities, maturing 6 to 10 years, average yield 2.61%    
Held-to-maturity securities, maturing over 10 years, average yield 2.88%    
Held-to-maturity securities, total average yield 2.87%    
States and political subdivisions
     
Schedule of Held-to-maturity Securities [Line Items]      
Debt securities, maturing within 1 year, amortized cost 0    
Debt securities, maturing 1 to 5 years, amortized cost 0    
Debt securities, maturing 5 to 10 years, amortized cost 339    
Debt securities, maturing over 10 years, amortized cost 3,521    
Debt securities, total amortized cost 3,860 3,525  
Debt securities, maturing within 1 year, fair value 0    
Debt securities, maturing 1 to 5 years, fair value 0    
Debt securities, maturing 5 to 10 years, fair value 343    
Debt securities, maturing over 10 years, fair value 3,907    
Debt securities, total fair value 4,250    
Residential mortgage-backed securities
     
Schedule of Held-to-maturity Securities [Line Items]      
Debt securities, maturing within 1 year, amortized cost 0    
Debt securities, maturing 1 to 5 years, amortized cost 0    
Debt securities, maturing 5 to 10 years, amortized cost 546    
Debt securities, maturing over 10 years, amortized cost 32,948    
Debt securities, total amortized cost 33,494 12,776  
Debt securities, maturing within 1 year, fair value 0    
Debt securities, maturing 1 to 5 years, fair value 0    
Debt securities, maturing 5 to 10 years, fair value 558    
Debt securities, maturing over 10 years, fair value 34,002    
Debt securities, total fair value 34,560    
Commercial mortgage-backed securities
     
Schedule of Held-to-maturity Securities [Line Items]      
Debt securities, maturing within 1 year, amortized cost 0    
Debt securities, maturing 1 to 5 years, amortized cost 0    
Debt securities, maturing 5 to 10 years, amortized cost 0    
Debt securities, maturing over 10 years, amortized cost 7,921    
Debt securities, total amortized cost 7,921    
Debt securities, maturing within 1 year, fair value 0    
Debt securities, maturing 1 to 5 years, fair value 0    
Debt securities, maturing 5 to 10 years, fair value 0    
Debt securities, maturing over 10 years, fair value 8,314    
Debt securities, total fair value $ 8,314