Accumulated Other Comprehensive Income Reclassifications out of 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
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other expense	$ 1,088	$ 1,227	$ 3,486	$ 4,542
Income tax expense	3,430	(276)	6,267	(17)
Total, net of tax	(1,517)	(1,773)	(6,559)	(5,842)
Amount Reclassified from AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total, net of tax	1	(21)	5	(466)
Available-for-sale securities [Member] | Amount Reclassified from AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Securities gains, net	0	(34)	0	(754)
Income tax expense	0	13	0	288
Total, net of tax	0	(21)	0	(466)
Interest rate swaps [member] | Amount Reclassified from AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other expense	2	0	8	0
Income tax expense	(1)	0	(3)	0
Total, net of tax	$ 1	$ 0	$ 5	$ 0