Accumulated Other Comprehensive Income (Loss) (Reclassification adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ 4,067	$ (6,520)	$ 11,341	$ (2,164)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(245)	0	(245)	0
Other Comprehensive Income (Loss), before Tax	3,670	(6,520)	10,944	(2,164)
Income before federal income tax expense	4,062	5,075	7,516	9,519
Federal income tax expense	655	977	1,092	1,748
NET INCOME	3,407	4,098	6,424	7,771
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(1,121)	2,165	(3,598)	799
Other Comprehensive Income (Loss), Net of Tax	2,549	(4,355)	7,346	(1,365)
Unrealized Holding Gains (Losses) on AFS Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	4,067	(6,520)		(2,164)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(245)	0	(245)	0
Other Comprehensive Income (Loss), before Tax	3,822	(6,520)	11,096	(2,164)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	1,173	(2,165)	3,650
Other Comprehensive Income (Loss), Net of Tax	2,649	(4,355)	7,446	(1,365)
Available-for-sale Securities, Excluding Auction Rate Money Market Preferred and Preferred Stocks [Member] | Unrealized Holding Gains (Losses) on AFS Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	3,695	(6,880)	10,981	(2,354)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	1,173	(2,165)	3,650	(799)
Other Comprehensive Income (Loss), Net of Tax	2,277	(4,715)	7,086	(1,555)
Auction Rate Money Market Preferred and Preferred Stocks [Member] | Unrealized Holding Gains (Losses) on AFS Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	372	360	360	190
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax	$ 372	$ 360	$ 360	$ 190