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Investments (Schedule of Investment Securities with Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (605) $ (1,195)
Fair Value, Less Than Twelve Months 103,158 30,459
Gross Unrealized Losses, Over Twelve Months (1,619) (4,206)
Fair Value, Over Twelve Months 93,952 164,320
U.S. Government agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (19) (92)
Fair Value, Less Than Twelve Months 1,260 1,913
Gross Unrealized Losses, Over Twelve Months (62) (17)
Fair Value, Over Twelve Months 1,937 1,920
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (576) (642)
Fair Value, Less Than Twelve Months 99,447 21,747
Gross Unrealized Losses, Over Twelve Months (1,068) (2,129)
Fair Value, Over Twelve Months 68,444 124,317
State and political subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (10) (461)
Fair Value, Less Than Twelve Months 2,451 6,799
Gross Unrealized Losses, Over Twelve Months (489) (2,060)
Fair Value, Over Twelve Months 23,571 38,083
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months      
Fair Value, Less Than Twelve Months      
Gross Unrealized Losses, Over Twelve Months      
Fair Value, Over Twelve Months