Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			0 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended
	Sep. 30, 2014 Defined Benefit Pension Plan	Sep. 30, 2013 Defined Benefit Pension Plan	Sep. 30, 2014 Defined Benefit Pension Plan	Sep. 30, 2013 Defined Benefit Pension Plan	Sep. 30, 2014 Post-Retirement Medical Plan	Sep. 30, 2013 Post-Retirement Medical Plan	Sep. 30, 2014 Post-Retirement Medical Plan	Sep. 30, 2013 Post-Retirement Medical Plan	Aug. 29, 2014 Post-Retirement Medical Plan J.P. Morgan Retirement Plan Services (RPS) plan_participant	Aug. 29, 2014 Post-Retirement Medical Plan J.P. Morgan Retirement Plan Services (RPS) Other liabilities with an offsetting decrease to AOCI	Aug. 29, 2014 Post-Retirement Medical Plan J.P. Morgan Retirement Plan Services (RPS) Other liabilities with an offsetting increase to goodwill	Sep. 30, 2014 Supplemental Executive Retirement Plan	Sep. 30, 2013 Supplemental Executive Retirement Plan	Sep. 30, 2014 Supplemental Executive Retirement Plan	Sep. 30, 2013 Supplemental Executive Retirement Plan	Aug. 01, 2014 Supplemental Executive Retirement Plan	Sep. 30, 2014 Supplemental Executive Retirement Plan Other liabilities with an offsetting decrease to AOCI
Components of net periodic cost (benefit):
Service cost	$ 1,364	$ 1,627	$ 3,713	$ 4,146	$ 327	$ 246	$ 739	$ 710				$ 30	$ 251	$ 440	$ 752
Interest cost	5,824	5,328	17,301	15,673	171	138	431	384				503	637	1,896	1,911
Expected return on plan assets	(7,328)	(6,317)	(21,966)	(18,375)	0	0	0	0				0	0	0	0
Amortization of unrecognized prior service costs (benefits)	12	13	38	38	(427)	(413)	(1,280)	(1,237)				234	233	700	699
Amortization of losses (gains) from earlier periods	885	4,212	2,174	12,001	(77)	(55)	(337)	(262)				165	325	350	975
Settlement	0	0	0	0	0	0	0	0				2,666	0	2,666	0
Net periodic cost (benefit)	757	4,863	1,260	13,483	(6)	(84)	(447)	(405)				3,598	1,446	6,052	4,337
Expected Employer contribution for the year ended December 31, 2014			10,717				524							16,917
Payments to plan	6,003	14,624	10,717	16,649	178	109	393	391				14,255	915	16,044	2,775
Settlement of projected benefit obligation (percent)																21.00%
Increase before tax to other liabilities										1,368	3,311						1,955
Reclassification of loss before tax to earnings from accumulated other comprehensive income												$ 2,666
Discount rate (percent)									4.07%							4.12%
Number of eligible participants of plan (individuals)									980