Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Changes in fair value of securities available for sale, before tax		$ 636	$ 578
Changes in fair value of securities available for sale, tax		235	214
Changes in fair value of securities available for sale		401	364
Net gains on securities reclassified into earnings, before tax		0	0
Net gains on securities reclassified into earnings, tax		0	0
Net gains on securities reclassified into earnings		0	0
Net change in fair value of securities available for sale, before tax		636	578
Net change in fair value of securities available for sale, tax		235	214
Net change in fair value of securities available for sale		401	364
Change in fair value of cash flow hedges, before tax		26	(124)
Change in fair value of cash flow hedges, tax		14	(58)
Change in fair value of cash flow hedges		12	(66)
Net cash flow hedge losses reclassified into earnings, before tax	[1]	136	0
Net cash flow hedge losses reclassified into earnings, tax		50	0
Net cash flow hedge losses reclassified into earnings		86	0
Net change in fair value of cash flow hedges, before tax		162	(124)
Net change in fair value of cash flow hedges, tax		64	(58)
Net change in fair value of cash flow hedges		98	(66)
Defined benefit plan obligation adjustment, before tax		0	0
Defined benefit plan obligation adjustment, tax		0	0
Defined benefit plan obligation adjustment		0	0
Amortization of net actuarial losses, before tax	[2]	344	(6)
Amortization of net actuarial losses, tax		127	(2)
Amortization of net actuarial losses		217	(4)
Amortization of net prior service credits, before tax	[2]	(6)	269
Amortization of net prior service credits, tax		(2)	99
Amortization of net prior service credits		(4)	170
Net change in defined benefit plan obligations, before tax		338	263
Net change in defined benefit plan obligations, tax		125	97
Net change in defined benefit plan obligations		213	166
Total other comprehensive income (loss), before tax		1,136	717
Total other comprehensive income (loss), tax		424	253
Total other comprehensive income, net of tax		$ 712	$ 464

[1] The pre-tax amount is included in interest expense on Federal Home Loan Bank advances in the Consolidated Statements of Income.

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