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) [Roll Forward]
Beginning balance			$ (7,475)	[1]	$ (17,605)
Other comprehensive income before reclassifications			(2,578)		8,142
Amounts reclassified from accumulated other comprehensive income			4		(445)
Other comprehensive income (loss), net of tax	$ (3,913)	$ 4,405	(2,574)		7,697
Ending balance	(10,049)	(9,908)	(10,049)		(9,908)
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			(2,515)		8,372
Amounts reclassified from accumulated other comprehensive income			0		(445)
Other comprehensive income (loss), net of tax			(2,515)		7,927
Ending balance	(5,532)	(6,549)	(5,532)		(6,549)
Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(324)		0
Other comprehensive income before reclassifications			(63)		(230)
Amounts reclassified from accumulated other comprehensive income			4		0
Other comprehensive income (loss), net of tax			(59)		(230)
Ending balance	(383)	(230)	(383)		(230)
Defined benefit plan items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(4,134)		(3,129)
Other comprehensive income before reclassifications			0		0
Amounts reclassified from accumulated other comprehensive income			0		0
Other comprehensive income (loss), net of tax			0		0
Ending balance	$ (4,134)	$ (3,129)	$ (4,134)		$ (3,129)

[1] Derived from audited consolidated financial statements