Derivatives and Hedging Activities (Offsetting Disclosure for Derivative Contracts) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Offsetting Disclosure for Derivative Contracts [Line Items]
Offsetting disclosure, derivative asset, fair value, gross	$ 29,839	$ 9,164	$ 1,731
Offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
Offsetting disclosure, net amount, derivative asset, falir value	29,839	9,164	1,731
Offseting disclosure, netting adjustment, derivative asset, fair value	(79)	(187)	(463)
Offsetting disclosure, collateral value, derivative asset	0	(238)	(115)
Offsetting disclosure, net amount total, derivative asset, fair value	29,760	8,739	1,153
Offsetting disclosure, derivative liability, fair value, gross	90,475	52,333	50,955
Offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
Offsetting disclosure, net amount, derivative liability, falir value	90,475	52,333	50,955
Offseting disclosure, netting adjustment, derivative liability, fair value	(79)	(187)	(463)
Offsetting disclosure, collateral value, derivative liability	(90,396)	(52,146)	(50,492)
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	29,760	8,739	1,153
Offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
Offsetting disclosure, net amount, derivative asset, falir value	29,760	8,739	1,153
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	29,760	8,739	1,153
Offsetting disclosure, derivative liability, fair value, gross	2,772	3,536	5,104
Offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
Offsetting disclosure, net amount, derivative liability, falir value	2,772	3,536	5,104
Offseting disclosure, netting adjustment, derivative liability, fair value	0	0	0
Offsetting disclosure, collateral value, derivative liability	(2,772)	(3,536)	(5,104)
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	3	155	414
Offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
Offsetting disclosure, net amount, derivative asset, falir value	3	155	414
Offseting disclosure, netting adjustment, derivative asset, fair value	(3)	(155)	(414)
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	87,572	48,765	45,802
Offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
Offsetting disclosure, net amount, derivative liability, falir value	87,572	48,765	45,802
Offseting disclosure, netting adjustment, derivative liability, fair value	(3)	(155)	(414)
Offsetting disclosure, collateral value, derivative liability	(87,569)	(48,610)	(45,388)
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	76	270	164
Offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
Offsetting disclosure, net amount, derivative asset, falir value	76	270	164
Offseting disclosure, netting adjustment, derivative asset, fair value	(76)	(32)	(49)
Offsetting disclosure, collateral value, derivative asset	0	(238)	(115)
Offsetting disclosure, net amount total, derivative asset, fair value	0	0	0
Offsetting disclosure, derivative liability, fair value, gross	131	32	49
Offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
Offsetting disclosure, net amount, derivative liability, falir value	131	32	49
Offseting disclosure, netting adjustment, derivative liability, fair value	(76)	(32)	(49)
Offsetting disclosure, collateral value, derivative liability	(55)	0	0
Offsetting disclosure, net amount total, derivative liability, fair value	$ 0	$ 0	$ 0