Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
COMPREHENSIVE INCOME
Change in fair value of securities available for sale, pre tax amount	$ 3,016	$ (3,910)	$ 9,666	$ (1,369)
Change in fair value of securities available for sale, tax (expense) benefit	(1,161)	1,496	(3,747)	516
Change in fair value of securities available for sale, after tax amount	1,855	(2,414)	5,919	(853)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, before Tax	2	(315)	(27)	(315)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, Tax	(1)	129	11	129
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, Net of Tax	1	(186)	(16)	(186)
Change in fair value of securities available for sale, pre tax amount	3,014	(3,595)	9,693	(1,054)
Change in fair value of securities available for sale, tax (expense) benefit	(1,160)	1,367	(3,758)	387
Change in fair value of securities available for sale, after tax amount	1,854	(2,228)	5,935	(667)
Change in fair value of cash flow hedges, pre tax amount	(882)	(36)	(1,338)	(603)
Change in fair value of cash flow hedges, tax (expense) benefit	360	(3)	548	228
Change in fair value of cash flow hedges, after tax amount	(522)	(39)	(790)	(375)
Less: net cash flow hedge losses reclassified into interest on borrowings expense, pre tax amount	(640)	(709)	(1,301)	(1,415)
Less: net cash flow hedge losses reclassified into earnings, tax (expense) benefit	262	288	532	576
Less: net cash flow hedge losses reclassified into interest on borrowings expense, after tax	(378)	(421)	(769)	(839)
Net change in fair value of cash flow hedges, pre tax amount	(242)	673	(37)	812
Net change in fair value of cash flow hedges, tax (expense) benefit	98	(291)	16	(348)
Net change in fair value of cash flow hedges	(144)	382	(21)	464
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(28)	43	(56)	87
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	11	(32)	22	(50)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	(17)	11	(34)	37
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	(61)	(60)	(122)	(121)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax	25	24	50	49
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax	(36)	(36)	(72)	(72)
Amortization of certain costs included in net periodic retirement costs, pre tax amount	(69)	(128)	(138)	(152)
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit	27	52	55	62
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	42	76	83	90
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	102	231	204	360
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	(41)	(108)	(83)	(161)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	61	123	121	199
Total other comprehensive income, pre tax amount	2,874	(2,691)	9,860	118
Total other comprehensive income, tax (expense) benefit	(1,103)	968	(3,825)	(122)
Total other comprehensive income, after tax amount	$ 1,771	$ (1,723)	$ 6,035	$ (4)