Derivatives and Hedging Activities (Offsetting Disclosure for Derivative Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Offsetting Disclosure for Derivative Contracts [Line Items]
offsetting disclosure, derivative asset, fair value, gross	$ 22,765	$ 9,164	$ 12,974
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	22,765	9,164	12,974
offseting disclosure, netting adjustment, derivative asset, fair value	(47)	(187)	(114)
offsetting disclosure, collateral value, derivative asset	0	(238)	(172)
offsetting disclosure, net amount total, derivative asset, fair value	22,718	8,739	12,688
offsetting disclosure, derivative liability, fair value, gross	78,478	52,333	65,190
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	78,478	52,333	65,190
offseting disclosure, netting adjustment, derivative liability, fair value	(47)	(187)	(114)
offsetting disclosure, collateral value, derivative liability	(78,431)	(52,146)	(65,076)
offsetting disclosure, net amount total, derivative liability, fair value	0	0	0
Designated as Hedging Instrument | Interest Rate Swap
Offsetting Disclosure for Derivative Contracts [Line Items]
offsetting disclosure, derivative asset, fair value, gross	22,718	8,739	12,688
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	22,718	8,739	12,688
offseting disclosure, netting adjustment, derivative asset, fair value	0	0	0
offsetting disclosure, collateral value, derivative asset	0	0	0
offsetting disclosure, net amount total, derivative asset, fair value	22,718	8,739	12,688
offsetting disclosure, derivative liability, fair value, gross	3,238	3,536	6,063
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	3,238	3,536	6,063
offseting disclosure, netting adjustment, derivative liability, fair value	0	0	0
offsetting disclosure, collateral value, derivative liability	(3,238)	(3,536)	(6,063)
offsetting disclosure, net amount total, derivative liability, fair value	0	0	0
Not Designated as Hedging Instrument | Interest Rate Swap
Offsetting Disclosure for Derivative Contracts [Line Items]
offsetting disclosure, derivative asset, fair value, gross	20	155	67
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	20	155	67
offseting disclosure, netting adjustment, derivative asset, fair value	(20)	(155)	(67)
offsetting disclosure, collateral value, derivative asset	0	0	0
offsetting disclosure, net amount total, derivative asset, fair value	0	0	0
offsetting disclosure, derivative liability, fair value, gross	75,119	48,765	59,080
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	75,119	48,765	59,080
offseting disclosure, netting adjustment, derivative liability, fair value	(20)	(155)	(67)
offsetting disclosure, collateral value, derivative liability	(75,099)	(48,610)	(59,013)
offsetting disclosure, net amount total, derivative liability, fair value	0	0	0
Not Designated as Hedging Instrument | Foreign Exchange Contract
Offsetting Disclosure for Derivative Contracts [Line Items]
offsetting disclosure, derivative asset, fair value, gross	27	270	219
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	27	270	219
offseting disclosure, netting adjustment, derivative asset, fair value	(27)	(32)	(47)
offsetting disclosure, collateral value, derivative asset	0	(238)	(172)
offsetting disclosure, net amount total, derivative asset, fair value	0	0	0
offsetting disclosure, derivative liability, fair value, gross	121	32	47
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	121	32	47
offseting disclosure, netting adjustment, derivative liability, fair value	(27)	(32)	(47)
offsetting disclosure, collateral value, derivative liability	(94)	0	0
offsetting disclosure, net amount total, derivative liability, fair value	$ 0	$ 0	$ 0