Investments (Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities) (Details) (Available-for-Sale Securities [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014 security	Dec. 31, 2013 security
Schedule of Available-for-sale Securities [Line Items]
Number of securities	41	58
Fair Value	$ 282,082	$ 321,936
Less than 12 months	341	15,243
More than 12 months	8,005	415
Total Unrealized Losses	8,346	15,658
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities	14	15
Fair Value	140,716	139,466
Less than 12 months		8,222
More than 12 months	3,757
Total Unrealized Losses	3,757	8,222
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities		12
Fair Value		11,680
Less than 12 months		156
Total Unrealized Losses		156
Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities	26	30
Fair Value	140,189	169,377
Less than 12 months	341	6,865
More than 12 months	4,076	127
Total Unrealized Losses	4,417	6,992
Trust Preferred [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities	1	1
Fair Value	1,177	1,413
More than 12 months	172	288
Total Unrealized Losses	$ 172	$ 288