Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated other comprehensive income (loss), beginning balance	$ (23,510)
Net other comprehensive income (loss)	(4,799)	$ 472	$ (10,058)
Reclassification of income tax effects due to the adoption of ASU 2018-02		0
Accumulated other comprehensive income (loss), ending balance	(28,309)	(23,510)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	(7,534)	(6,825)	1,051
Other comprehensive income (loss) before reclassifications, net of tax	(9,228)	621	(7,876)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0
Net other comprehensive income (loss)	(9,228)	621	(7,876)
Reclassification of income tax effects due to the adoption of ASU 2018-02		(1,330)
Accumulated other comprehensive income (loss), ending balance	(16,762)	(7,534)	(6,825)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(428)	(300)	(43)
Other comprehensive income (loss) before reclassifications, net of tax	488	(551)	(257)
Amounts reclassified from accumulated other comprehensive income, net of tax	131	499	0
Net other comprehensive income (loss)	619	(52)	(257)
Reclassification of income tax effects due to the adoption of ASU 2018-02		(76)
Accumulated other comprehensive income (loss), ending balance	191	(428)	(300)
Defined Benefit Pension Plan Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(15,548)	(12,632)	(10,707)
Other comprehensive income (loss) before reclassifications, net of tax	2,369	(741)	(2,588)
Amounts reclassified from accumulated other comprehensive income, net of tax	1,441	644	663
Net other comprehensive income (loss)	3,810	(97)	(1,925)
Reclassification of income tax effects due to the adoption of ASU 2018-02		(2,819)
Accumulated other comprehensive income (loss), ending balance	(11,738)	(15,548)	(12,632)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(23,510)	(19,757)	(9,699)
Other comprehensive income (loss) before reclassifications, net of tax	(6,371)	(671)	(10,721)
Amounts reclassified from accumulated other comprehensive income, net of tax	1,572	1,143	663
Net other comprehensive income (loss)	(4,799)	472	(10,058)
Reclassification of income tax effects due to the adoption of ASU 2018-02		(4,225)
Accumulated other comprehensive income (loss), ending balance	$ (28,309)	$ (23,510)	$ (19,757)