Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Change in fair value of securities available for sale, before tax		$ (12,063)		$ 986		$ (12,502)
Change in fair value of securities available for sale, tax		(2,835)		365		(4,626)
Change is fair value of securities available for sale		(9,228)		621		(7,876)
Net (gains) losses on securities classified into earnings, before tax		0		0		0
Net (gains) losses on securities classified into earnings, tax		0		0		0
Net (gains) losses on securities classified into earnings		0		0		0
Net change in fair value of securities available for sale, before tax		(12,063)		986		(12,502)
Net change in fair value of securities available for sale, tax		(2,835)		365		(4,626)
Net change in fair value of securities available for sale		(9,228)		621		(7,876)
Net change in fair value of cash flow hedges, before tax		639		(774)		(403)
Net change in fair value of cash flow hedges, tax		151		(223)		(146)
Change in fair value of cash flow hedges		488		(551)		(257)
Net cash flow hedge losses reclassified into earnings, before tax		170	[1]	792	[1]	0
Net cash flow hedge losses reclassified into earnings, tax		39	[1]	293	[1]	0
Net cash flow hedge losses reclassified into earnings		131	[1]	499	[1]	0
Change in fair value of cash flow hedges, before tax		809		18		(403)
Change in fair value of cash flow hedges, tax		190		70		(146)
Net change in fair value of cash flow hedges		619		(52)		(257)
Defined benefit plan obligation adjustment, before tax		3,098		(1,591)		(4,106)
Defined benefit plan obligation adjustment, tax		729		(594)		(1,518)
Defined benefit plan obligation adjustment		2,369		(997)		(2,588)
Amortization of net actuarial losses, before tax	[2]	1,907		1,461		1,075
Amortization of net actuarial losses, tax	[2]	448		546		397
Amortization of net actuarial losses	[2]	1,459		915		678
Amortization of net prior service credits, before tax	[2]	(24)		(24)		(24)
Amortization of net prior service credits, tax	[2]	(6)		(9)		(9)
Amortization of net prior service credits	[2]	(18)		(15)		(15)
Net change in defined benefit plan obligations, before tax		4,981		(154)		(3,055)
Net change in defined benefit plan obligations, tax		1,171		(57)		(1,130)
Net change in defined benefit plan obligations		3,810		(97)		(1,925)
Total other comprehensive income (loss), before tax		(6,273)		850		(15,960)
Total other comprehensive income (loss), tax		(1,474)		378		(5,902)
Total other comprehensive (loss) income, net of tax		(4,799)		472		(10,058)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Total other comprehensive (loss) income, net of tax		$ (9,228)		$ 621		$ (7,876)

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

[2] The pre-tax amounts are included in other expenses in the Consolidated Statements of Income.