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Investments (Schedule of Amortized Cost and Estimated Fair Value of Investment Securities) (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]    
Amortized Cost $ 461,990 $ 424,315
Gross Unrealized Gains 7,922 6,130
Gross Unrealized Losses (2,224) (5,401)
Estimated Fair Value 467,688 425,044
U.S. Government agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,464 5,395
Gross Unrealized Gains 6 18
Gross Unrealized Losses (81) (109)
Estimated Fair Value 4,389 5,304
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 359,954 320,223
Gross Unrealized Gains 3,804 3,269
Gross Unrealized Losses (1,644) (2,771)
Estimated Fair Value 362,114 320,721
States and political subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 96,199 97,361
Gross Unrealized Gains 2,923 1,723
Gross Unrealized Losses (499) (2,521)
Estimated Fair Value 98,623 96,563
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,373 1,336
Gross Unrealized Gains 1,189 1,120
Gross Unrealized Losses      
Estimated Fair Value $ 2,562 $ 2,456