Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
COMPREHENSIVE INCOME
Change in fair value of securities available for sale, pre tax amount	$ (1,315)	$ 1,966	$ 8,351	$ 597
Change in fair value of securities available for sale, tax (expense) benefit	499	(755)	(3,248)	(239)
Change in fair value of securities available for sale, after tax amount	(816)	1,211	5,103	358
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, before Tax	0	0	(27)	(315)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, Tax	0	0	11	129
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, Net of Tax	0	0	(16)	(186)
Change in fair value of securities available for sale, pre tax amount	(1,315)	1,966	8,378	912
Change in fair value of securities available for sale, tax (expense) benefit	499	(755)	(3,259)	(368)
Change in fair value of securities available for sale, after tax amount	(816)	1,211	5,119	544
Change in fair value of cash flow hedges, pre tax amount	486	(493)	(852)	(1,096)
Change in fair value of cash flow hedges, tax (expense) benefit	(196)	201	352	429
Change in fair value of cash flow hedges, after tax amount	290	(292)	(500)	(667)
Less: net cash flow hedge losses reclassified into interest on borrowings expense, pre tax amount	648	715	1,949	2,130
Less: net cash flow hedge losses reclassified into earnings, tax (expense) benefit	264	291	796	867
Less: net cash flow hedge losses reclassified into interest on borrowings expense, after tax	384	424	1,153	1,263
Net change in fair value of cash flow hedges, pre tax amount	1,134	222	1,097	1,034
Net change in fair value of cash flow hedges, tax (expense) benefit	(460)	(90)	(444)	(438)
Net change in fair value of cash flow hedges	674	132	653	596
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(28)	50	(84)	137
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	11	(21)	33	(71)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	(17)	29	(51)	66
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	61	61	183	182
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax	(25)	(25)	(75)	(74)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax	36	36	108	108
Amortization of certain costs included in net periodic retirement costs, pre tax amount	69	75	207	227
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit	(29)	(30)	(84)	(92)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	40	45	123	135
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	102	186	306	546
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	(43)	(76)	(126)	(237)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	59	110	180	309
Total other comprehensive income, pre tax amount	(79)	2,374	9,781	2,492
Total other comprehensive income, tax (expense) benefit	(4)	(921)	(3,829)	(1,043)
Total other comprehensive income, after tax amount	$ (83)	$ 1,453	$ 5,952	$ 1,449