Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
COMPREHENSIVE INCOME
Change in fair value of securities available for sale, pre tax amount	$ 1,966	$ (1,322)	$ 597	$ 5,869
Change in fair value of securities available for sale, tax (expense) benefit	(755)	512	(239)	(2,325)
Change in fair value of securities available for sale, after tax amount	1,211	(810)	358	3,544
Net Security Gains Losses Reclassified Into Earnings Before Tax Amount	0	67	(315)	138
Net Security Gains Losses Reclassified Into Earnings Tax Amount	0	(27)	129	(56)
Net Security Gains Losses Reclassified Into Earnings Net Of Tax Amount	0	40	(186)	82
Change in fair value of securities available for sale, pre tax amount	1,966	(1,389)	912	5,731
Change in fair value of securities available for sale, tax (expense) benefit	(755)	539	(368)	(2,269)
Change in fair value of securities available for sale, after tax amount	1,211	(850)	544	3,462
Change in fair value of cash flow hedges, pre tax amount	(493)	252	(1,096)	(535)
Change in fair value of cash flow hedges, tax (expense) benefit	201	(103)	429	220
Change in fair value of cash flow hedges, after tax amount	(292)	149	(667)	(315)
Less: net cash flow hedge losses reclassified into interest on borrowings expense, pre tax amount	(715)	(726)	(2,130)	(2,937)
Less: net cash flow hedge losses reclassified into earnings, tax (expense) benefit	291	297	867	1,200
Less: net cash flow hedge losses reclassified into interest on borrowings expense, after tax	(424)	(429)	(1,263)	(1,737)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	0	0		(1,122)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Tax		0		459
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Net of Tax		0		(663)
Net change in fair value of cash flow hedges, pre tax amount	222	978	1,034	3,524
Net change in fair value of cash flow hedges, tax (expense) benefit	(90)	(400)	(438)	(1,439)
Net change in fair value of cash flow hedges	132	578	596	2,085
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	50	(80)	137	(240)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	(21)	32	(71)	98
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	29	(48)	66	(142)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	61	(10)	182	(32)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax	(25)	5	(74)	13
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax	36	(5)	108	(19)
Amortization of certain costs included in net periodic retirement costs, pre tax amount	75	26	227	76
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit	(30)	(11)	(92)	(31)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	45	15	135	45
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), before Tax		(2)		(2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), Tax		1		1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), Net of Tax		(1)		(1)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	186	(66)	546	(198)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	(76)	27	(237)	81
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	110	(39)	309	(117)
Total other comprehensive income, pre tax amount	2,374	(477)	2,492	9,057
Total other comprehensive income, tax (expense) benefit	(921)	166	(1,043)	(3,627)
Total other comprehensive income, after tax amount	$ 1,453	$ (311)	$ 1,449	$ 5,430