Accumulated Other Comprehensive Income (Loss) (Reclassification Adjustment Details) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on investment securities	$ 0	$ 126
Total before tax	4,216	4,480
Provision for income taxes	(880)	(1,077)
Reclassification adjustments, Net of tax	3,336	3,403
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustments, Net of tax	(67)	61
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains on Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on investment securities		126
Total before tax		126
Provision for income taxes		(44)
Reclassification adjustments, Net of tax		82
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Compensation and benefits	(103)	(32)
Total before tax	(103)	(32)
Provision for income taxes	36	11
Reclassification adjustments, Net of tax	$ (67)	$ (21)