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Investments (Schedule of Contractual Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Amortized Cost    
Maturing within one year $ 1,204 $ 2,294
Maturing after one year through five years 213,652 241,396
Maturing after five years through ten years 76,629 59,572
Maturing after ten years 50,748 49,674
Fair Value    
Maturing within one year 1,212 2,316
Maturing after one year through five years 216,249 242,493
Maturing after five years through ten years 77,761 59,402
Maturing after ten years 51,294 47,737
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 461,990 424,315
Fair Value 467,688 425,044
U.S Government agencies collateralized by mortgage obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 118,384 70,043
Fair Value 118,610 70,640
Other securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,373 1,336
Fair Value $ 2,562 $ 2,456