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Investments (Amortized cost and fair values of investments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale Securities [Abstract]    
Amortized Cost $ 274,339 $ 214,581
Cumulative Non-Credit OTTI (Losses) Recognized in OCI (1,661) (2,011)
Gross Unrealized Gains 9,016 7,393
Gross Unrealized Losses (1,525) (924)
Fair Value/ Carrying Value 280,169 219,039
Held-to-maturity Securities, Unclassified [Abstract]    
Carrying Value/ Amortized Cost 14,826 16,143
Fair Value 16,344  
U.S. treasury securities and obligations of U.S. government agencies
   
Available-for-sale Securities [Abstract]    
Amortized Cost   21
Cumulative Non-Credit OTTI (Losses) Recognized in OCI   0
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value/ Carrying Value   21
State and municipal securities
   
Available-for-sale Securities [Abstract]    
Amortized Cost 60,984 35,352
Cumulative Non-Credit OTTI (Losses) Recognized in OCI 0 0
Gross Unrealized Gains 2,823 1,791
Gross Unrealized Losses (158) (8)
Fair Value/ Carrying Value 63,649 37,135
Held-to-maturity Securities, Unclassified [Abstract]    
Carrying Value/ Amortized Cost 14,826 16,143
Cumulative Non-Credit OTTI Losses Recognized in OCI 0 0
Gross Unrealized Gains 1,518 1,328
Gross Unrealized Losses 0 0
Fair Value 16,344 17,471
Mortgage-backed securities - Agency Pass Throughs
   
Available-for-sale Securities [Abstract]    
Amortized Cost 71,821 59,436
Cumulative Non-Credit OTTI (Losses) Recognized in OCI 0 0
Gross Unrealized Gains 2,224 2,252
Gross Unrealized Losses (652) (126)
Fair Value/ Carrying Value 73,393 61,562
SBA Pools
   
Available-for-sale Securities [Abstract]    
Amortized Cost 19,962  
Cumulative Non-Credit OTTI (Losses) Recognized in OCI 0  
Gross Unrealized Gains 359  
Gross Unrealized Losses 0  
Fair Value/ Carrying Value 20,321  
Agency Securities | CMO's
   
Available-for-sale Securities [Abstract]    
Amortized Cost 110,683 103,349
Cumulative Non-Credit OTTI (Losses) Recognized in OCI 0 0
Gross Unrealized Gains 2,209 2,526
Gross Unrealized Losses (328) (328)
Fair Value/ Carrying Value 112,564 105,547
Non-Agency (investment grade ) | CMO's
   
Available-for-sale Securities [Abstract]    
Amortized Cost   5,934
Cumulative Non-Credit OTTI (Losses) Recognized in OCI   0
Gross Unrealized Gains   389
Gross Unrealized Losses   0
Fair Value/ Carrying Value   6,323
Non-Agency (below investment grade) | CMO's
   
Available-for-sale Securities [Abstract]    
Amortized Cost 10,889 10,489
Cumulative Non-Credit OTTI (Losses) Recognized in OCI (1,661) (2,011)
Gross Unrealized Gains 1,401 435
Gross Unrealized Losses (387) (462)
Fair Value/ Carrying Value $ 10,242 $ 8,451