Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Changes in fair value of securities available for sale, before tax		$ 1,736	$ (144)	$ 5,274	$ 2,621
Changes in fair value of securities available for sale, tax		642	(53)	1,951	970
Changes in fair value of securities available for sale		1,094	(91)	3,323	1,651
Net gains on securities reclassified into earnings, before tax		0	0	0	0
Net gains on securities reclassified into earnings, tax		0	0	0	0
Net gains on securities reclassified into earnings		0	0	0	0
Net change in fair value of securities available for sale, before tax		1,736	(144)	5,274	2,621
Net change in fair value of securities available for sale, tax		642	(53)	1,951	970
Net change in fair value of securities available for sale		1,094	(91)	3,323	1,651
Change in fair value of cash flow hedges, before tax		(237)	(15)	(1,064)	(129)
Change in fair value of cash flow hedges, tax		(83)	(11)	(361)	(35)
Change in fair value of cash flow hedges		(154)	(4)	(703)	(94)
Net cash flow hedge losses reclassified into earnings, before tax	[1]	224	0	539	0
Net cash flow hedge losses reclassified into earnings, tax	[1]	83	0	200	0
Net cash flow hedge losses reclassified into earnings	[1]	141	0	339	0
Net change in fair value of cash flow hedges, before tax		(13)	(15)	(525)	(129)
Net change in fair value of cash flow hedges, tax		0	(11)	(161)	(35)
Net change in fair value of cash flow hedges		(13)	(4)	(364)	(94)
Defined benefit plan obligation adjustment, before tax		0	263	(407)	789
Defined benefit plan obligation adjustment, tax		0	97	(150)	292
Defined benefit plan obligation adjustment		0	166	(257)	497
Amortization of net actuarial losses, before tax	[2]	355	0	1,105	0
Amortization of net actuarial losses, tax	[2]	134	0	411	0
Amortization of net actuarial losses	[2]	221	0	694	0
Amortization of net prior service credits, before tax	[2]	(6)	0	(17)	0
Amortization of net prior service credits, tax	[2]	(2)	0	(7)	0
Amortization of net prior service credits	[2]	(4)	0	(10)	0
Net change in defined benefit plan obligations, before tax		349	263	681	789
Net change in defined benefit plan obligations, tax		132	97	254	292
Net change in defined benefit plan obligations		217	166	427	497
Total other comprehensive income (loss), before tax		2,072	104	5,430	3,281
Total other comprehensive income (loss), tax		774	33	2,044	1,227
Total other comprehensive income (loss), net of tax		$ 1,298	$ 71	$ 3,386	$ 2,054

[1] The pre-tax amounts are included in interest expense on Federal Home Loan Bank advances, interest expense on junior subordinated debentures and interest and fees on loans in the Unaudited Consolidated Statements of Income.

[2] The pre-tax amounts are included in salaries and employee benefits expense in the Unaudited Consolidated Statements of Income.