Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ (7,475)	[1]	$ (17,605)
Other comprehensive income before reclassifications			457		8,032
Amounts reclassified from accumulated other comprehensive income			5		(466)
Other comprehensive income (loss), net of tax	$ 3,036	$ (131)	462		7,566
Ending balance	(7,013)	(10,039)	(7,013)		(10,039)
Unrealized Gains (Losses) on Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(3,017)		(14,476)
Other comprehensive income before reclassifications			1,043		8,050
Amounts reclassified from accumulated other comprehensive income			0		(466)
Other comprehensive income (loss), net of tax			1,043		7,584
Ending balance	(1,974)	(6,892)	(1,974)		(6,892)
Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(324)		0
Other comprehensive income before reclassifications			(521)		(18)
Amounts reclassified from accumulated other comprehensive income			5		0
Other comprehensive income (loss), net of tax			(516)		(18)
Ending balance	(840)	(18)	(840)		(18)
Defined Benefit Plan Items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(4,134)		(3,129)
Other comprehensive income before reclassifications			(65)		0
Amounts reclassified from accumulated other comprehensive income			0		0
Other comprehensive income (loss), net of tax			(65)		0
Ending balance	$ (4,199)	$ (3,129)	$ (4,199)		$ (3,129)

[1] Derived from audited consolidated financial statements