Other Comprehensive Income (Activity in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 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	$ (339)	$ (482)	$ (1,032)	$ 5,252
Unrealized (losses) gains on securities arising during the period, tax	(121)	(172)	(356)	1,937
Unrealized (losses) gains on securities arising during the period, net of tax	(218)	(310)	(676)	3,315
Less: reclassification adjustment for net gains on securities realized in net income, before tax	0	0	214	143
Less: reclassification adjustment for net gains on securities realized in net income, tax	0	0	76	51
Less: reclassification adjustment for net gains on securities realized in net income	0	0	138	92
Net unrealized (losses) gains on securities available for sale, before tax	(339)	(482)	(1,246)	5,109
Net unrealized (losses) gains on securities available for sale, tax	(121)	(172)	(432)	1,886
Net unrealized (losses) gains on securities available for sale, net of tax	(218)	(310)	(814)	3,223
Reclassification adjustment for change in non-credit portion of OTTI realized losses transferred to net income, before tax	0	44	124	39
Reclassification adjustment for change in non-credit portion of OTTI realized losses transferred to net income, tax	0	(57)	44	(49)
Reclassification adjustment for change in non-credit portion of OTTI realized losses transferred to net income, net of tax	0	101	80	88
Unrealized losses on cash flow hedges arising during the period, before tax	(198)	(774)	(518)	(1,425)
Unrealized losses on cash flow hedges arising during the period, tax	(71)	(276)	(187)	(508)
Unrealized losses on cash flow hedges arising during the period, net of tax	(127)	(498)	(331)	(917)
Less: reclassification adjustment for amount of gains on cash flow hedges realized in net income, before tax	176	191	523	572
Less: reclassification adjustment for amount of gains on cash flow hedges realized in net income, tax	63	68	187	204
Less: reclassification adjustment for amount of gains on cash flow hedges realized in net income, net of tax	113	123	336	368
Net unrealized (losses) gains on cash flow hedges, before tax	(22)	(583)	5	(853)
Net unrealized (losses) gains on cash flow hedges, tax	(8)	(208)	0	(304)
Net unrealized (losses) gains on cash flow hedges, net of tax	(14)	(375)	5	(549)
Defined benefit plan obligation adjustment, before tax	266	27	799	281
Defined benefit plan obligation adjustment, tax	95	(33)	272	100
Defined benefit plan obligation adjustment, net of tax	171	60	527	181
Total other comprehensive (loss) income, before tax	(95)	(994)	(318)	4,576
Total other comprehensive (loss) income, tax	(34)	(470)	(116)	1,633
Total other comprehensive (loss) income, net of tax	$ (61)	$ (524)	$ (202)	$ 2,943