Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	$ 6,387	$ (2,999)	$ 2,890	$ (5,263)
Other Comprehensive Income (Loss) Before Reclassification	(5,794)	2,996	(1,996)	5,408
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(170)	(159)	(471)	(307)
Total Other Comprehensive Income (Loss)	(5,964)	2,837	(2,467)	5,101
Accumulated other comprehensive income, Ending Balance	423	(162)	423	(162)
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	6,455	(2,967)	2,958	(5,231)
Other Comprehensive Income (Loss) Before Reclassification	(5,794)	2,996	(1,996)	5,408
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(170)	(159)	(471)	(307)
Total Other Comprehensive Income (Loss)	(5,964)	2,837	(2,467)	5,101
Accumulated other comprehensive income, Ending Balance	491	(130)	491	(130)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	0	0	0	0
Other Comprehensive Income (Loss) Before Reclassification	0	0	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0	0	0
Total Other Comprehensive Income (Loss)	0	0	0	0
Accumulated other comprehensive income, Ending Balance	0	0	0	0
Postretirement Benefit Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	(68)	(32)	(68)	(32)
Other Comprehensive Income (Loss) Before Reclassification	0	0	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0	0	0
Total Other Comprehensive Income (Loss)	0	0	0	0
Accumulated other comprehensive income, Ending Balance	$ (68)	$ (32)	$ (68)	$ (32)