Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 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		$ 2,902	$ 2,187	$ 3,538	$ 2,765
Changes in fair value of securities available for sale, tax		1,074	809	1,309	1,023
Changes in fair value of securities available for sale		1,828	1,378	2,229	1,742
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		2,902	2,187	3,538	2,765
Net change in fair value of securities available for sale, tax		1,074	809	1,309	1,023
Net change in fair value of securities available for sale		1,828	1,378	2,229	1,742
Change in fair value of cash flow hedges, before tax		(853)	10	(827)	(114)
Change in fair value of cash flow hedges, tax		(292)	34	(278)	(24)
Change in fair value of cash flow hedges		(561)	(24)	(549)	(90)
Net cash flow hedge losses reclassified into earnings, before tax	[1]	180	0	316	0
Net cash flow hedge losses reclassified into earnings, tax	[1]	67	0	117	0
Net cash flow hedge losses reclassified into earnings	[1]	113	0	199	0
Net change in fair value of cash flow hedges, before tax		(673)	10	(511)	(114)
Net change in fair value of cash flow hedges, tax		(225)	34	(161)	(24)
Net change in fair value of cash flow hedges		(448)	(24)	(350)	(90)
Defined benefit plan obligation adjustment, before tax		(407)	0	(407)	0
Defined benefit plan obligation adjustment, tax		(150)	0	(150)	0
Defined benefit plan obligation adjustment		(257)	0	(257)	0
Amortization of net actuarial losses, before tax	[2]	406	269	750	538
Amortization of net actuarial losses, tax	[2]	149	99	276	198
Amortization of net actuarial losses	[2]	257	170	474	340
Amortization of net prior service credits, before tax	[2]	(5)	(6)	(11)	(12)
Amortization of net prior service credits, tax	[2]	(1)	(1)	(3)	(3)
Amortization of net prior service credits	[2]	(4)	(5)	(8)	(9)
Net change in defined benefit plan obligations, before tax		(6)	263	332	526
Net change in defined benefit plan obligations, tax		(2)	98	123	195
Net change in defined benefit plan obligations		(4)	165	209	331
Total other comprehensive income (loss), before tax		2,223	2,460	3,359	3,177
Total other comprehensive income (loss), tax		847	941	1,271	1,194
Total other comprehensive income (loss), net of tax		$ 1,376	$ 1,519	$ 2,088	$ 1,983

[1] The pre-tax amounts are included in interest expense on Federal Home Loan Bank advances and interest expense on junior subordinated debentures 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.