Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
COMPREHENSIVE INCOME
Change in fair value of securities available for sale, pre tax amount	$ (3,910)	$ 3,904	$ (1,369)	$ 7,191
Change in fair value of securities available for sale, tax (expense) benefit	1,496	(1,521)	516	(2,837)
Change in fair value of securities available for sale, after tax amount	(2,414)	2,383	(853)	4,354
Net Security Gains Losses Reclassified Into Earnings Before Tax Amount	(315)	(20)	(315)	71
Net Security Gains Losses Reclassified Into Earnings Tax Amount	129	8	129	(29)
Net Security Gains Losses Reclassified Into Earnings Net Of Tax Amount	(186)	(12)	(186)	42
Change in fair value of securities available for sale, pre tax amount	(3,595)	3,924	(1,054)	7,120
Change in fair value of securities available for sale, tax (expense) benefit	1,367	(1,529)	387	(2,808)
Change in fair value of securities available for sale, after tax amount	(2,228)	2,395	(667)	4,312
Change in fair value of cash flow hedges, pre tax amount	(36)	(487)	(603)	(787)
Change in fair value of cash flow hedges, tax (expense) benefit	(3)	200	228	323
Change in fair value of cash flow hedges, after tax amount	(39)	(287)	(375)	(464)
Less: net cash flow hedge losses reclassified into interest on borrowings expense, pre tax amount	(709)	(1,063)	(1,415)	(2,211)
Less: net cash flow hedge losses reclassified into earnings, tax (expense) benefit	288	434	576	903
Less: net cash flow hedge losses reclassified into interest on borrowings expense, after tax	(421)	(629)	(839)	(1,308)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	0	(1,122)		(1,122)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Tax		459		459
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Net of Tax		(663)		(663)
Net change in fair value of cash flow hedges, pre tax amount	673	1,698	812	2,546
Net change in fair value of cash flow hedges, tax (expense) benefit	(291)	(693)	(348)	(1,039)
Net change in fair value of cash flow hedges	382	1,005	464	1,507
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	43	(80)	87	(160)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	(32)	33	(50)	66
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	11	(47)	37	(94)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	60	(11)	121	(22)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax	(24)	4	(49)	8
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax	36	(7)	72	(14)
Amortization of certain costs included in net periodic retirement costs, pre tax amount	128	25	152	50
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit	(52)	(10)	(62)	(20)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	76	15	90	30
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	231	(66)	360	(132)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	(108)	27	(161)	54
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	123	(39)	199	(78)
Total other comprehensive income, pre tax amount	(2,691)	5,556	118	9,534
Total other comprehensive income, tax (expense) benefit	968	(2,195)	(122)	(3,793)
Total other comprehensive income, after tax amount	$ (1,723)	$ 3,361	$ (4)	$ 5,741