Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
COMPREHENSIVE INCOME
Change in fair value of securities available for sale, pre tax amount	$ 6,708	$ 2,541
Change in fair value of securities available for sale, tax (expense) benefit	(2,610)	(980)
Change in fair value of securities available for sale, after tax amount	4,098	1,561
Net Security Gains Losses Reclassified Into Earnings Before Tax Amount	29	0
Net Security Gains Losses Reclassified Into Earnings Tax Amount	(12)	0
Net Security Gains Losses Reclassified Into Earnings Net Of Tax Amount	17	0
Change in fair value of securities available for sale, pre tax amount	6,679	2,541
Change in fair value of securities available for sale, tax (expense) benefit	(2,598)	(980)
Change in fair value of securities available for sale, after tax amount	4,081	1,561
Change in fair value of cash flow hedges, pre tax amount	(456)	(567)
Change in fair value of cash flow hedges, tax (expense) benefit	188	231
Change in fair value of cash flow hedges, after tax amount	(268)	(336)
Less: net cash flow hedge losses reclassified into interest on borrowings expense, pre tax amount	(661)	(706)
Less: net cash flow hedge losses reclassified into earnings, tax (expense) benefit	270	288
Less: net cash flow hedge losses reclassified into interest on borrowings expense, after tax	(391)	(418)
Net change in fair value of cash flow hedges, pre tax amount	205	139
Net change in fair value of cash flow hedges, tax (expense) benefit	(82)	(57)
Net change in fair value of cash flow hedges	123	82
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(28)	44
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	11	(18)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	(17)	26
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	(61)	(61)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax	25	25
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax	(36)	(36)
Amortization of certain costs included in net periodic retirement costs, pre tax amount	(69)	(24)
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit	28	10
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	(41)	(14)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	102	129
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	(42)	(53)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	60	76
Total other comprehensive income, pre tax amount	6,986	2,809
Total other comprehensive income, tax (expense) benefit	(2,722)	(1,090)
Total other comprehensive income, after tax amount	$ 4,264	$ 1,719