Other Comprehensive Income (Activity in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Unrealized (losses) gains on securities arising during the period, before tax	$ (934)	$ 5,495	$ (693)	$ 5,636
Unrealized (losses) gains on securities arising during the period, tax	(333)	1,958	(235)	2,010
Unrealized (losses) gains on securities arising during the period, net of tax	(601)	3,537	(458)	3,626
Less: reclassification adjustment for net gains on securities realized in net income, before tax	299	226	214	143
Less: reclassification adjustment for net gains on securities realized in net income, tax	107	81	76	51
Less: reclassification adjustment for net gains on securities realized in net income	192	145	138	92
Net unrealized (losses) gains on securities available for sale, before tax	(1,233)	5,269	(907)	5,493
Net unrealized (losses) gains on securities available for sale, tax	(440)	1,877	(311)	1,959
Net unrealized (losses) gains on securities available for sale, net of tax	(793)	3,392	(596)	3,534
Reclassification adjustment for change in non-credit portion of OTTI realized losses transferred to net income, before tax			124	(21)
Reclassification adjustment for change in non-credit portion of OTTI realized losses transferred to net income, tax			44	(8)
Reclassification adjustment for change in non-credit portion of OTTI realized losses transferred to net income, net of tax	0	0	80	(13)
Unrealized losses on cash flow hedges arising during the period, before tax	(199)	(727)	(320)	(651)
Unrealized losses on cash flow hedges arising during the period, tax	(71)	(259)	(116)	(232)
Unrealized losses on cash flow hedges arising during the period, net of tax	(128)	(468)	(204)	(419)
Less: reclassification adjustment for amount of gains on cash flow hedges realized in net income, before tax	174	190	347	381
Less: reclassification adjustment for amount of gains on cash flow hedges realized in net income, tax	62	68	124	136
Less: reclassification adjustment for amount of gains on cash flow hedges realized in net income, net of tax	112	122	223	245
Net unrealized (losses) gains on cash flow hedges, before tax	(25)	(537)	27	(270)
Net unrealized (losses) gains on cash flow hedges, tax	(9)	(191)	8	(96)
Net unrealized (losses) gains on cash flow hedges, net of tax	(16)	(346)	19	(174)
Defined benefit plan obligation adjustment, before tax	266	93	533	186
Defined benefit plan obligation adjustment, tax	95	33	177	66
Defined benefit plan obligation adjustment, net of tax	171	60	356	120
Total other comprehensive (loss) income, before tax	(992)	4,825	(223)	5,388
Total other comprehensive (loss) income, tax	(354)	1,719	(82)	1,921
Total other comprehensive (loss) income, net of tax	$ (638)	$ 3,106	$ (141)	$ 3,467