Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021		Sep. 30, 2020
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Changes in fair value of available for sale debt securities, before tax		$ (4,127)		$ (4,582)		$ (16,212)		$ 9,794
Changes in fair value of available for sale debt securities, tax		(990)		(1,077)		(3,890)		2,301
Changes in fair value of available for sale debt securities, net of tax		(3,137)		(3,505)		(12,322)		7,493
Changes in fair value of cash flow hedges, before tax		(288)		(146)		(21)		(1,994)
Changes in fair value of cash flow hedges, tax		(69)		(39)		(5)		(473)
Change in fair value of cash flow hedges , net of tax		(219)		(107)		(16)		(1,521)
Net cash flow hedge gains (losses) reclassified into earnings, before tax		(243)	[1]	344	[2]	(27)	[1]	829	[2]
Net cash flow hedge gains (losses) reclassified into earnings, tax		(59)	[1]	83	[2]	(7)	[1]	196	[2]
Net cash flow hedge gains (losses) reclassified into earnings, net of tax		(184)	[1]	261	[2]	(20)	[1]	633	[2]
Net change in fair value of cash flow hedges, before tax		(531)		198		(48)		(1,165)
Net change in fair value of cash flow hedges, tax		(128)		44		(12)		(277)
Net change in fair value of cash flow hedges, net of tax		(403)		154		(36)		(888)
Amortization of net actuarial losses, before tax	[3]	711		535		2,133		1,606
Amortization of net actuarial losses, tax	[3]	171		125		512		377
Amortization of net actuarial losses, net of tax	[3]	540		410		1,621		1,229
Total other comprehensive income (loss), before tax		(3,947)		(3,849)		(14,127)		10,235
Total other comprehensive income (loss), tax		(947)		(908)		(3,390)		2,401
Total other comprehensive income (loss), net of tax		$ (3,000)		$ (2,941)		$ (10,737)		$ 7,834

[1] The pre-tax amounts for the three months ended September 30, 2021 are included in interest expense on FHLB advances and interest and fees on loans in the Unaudited Consolidated Statements of Income.

[2] The pre-tax amounts for the three months ended September 30, 2020 are included in interest expense on FHLB advances, interest expense on junior subordinated debentures and interest and fees on loans in the Unaudited Consolidated Statements of Income.

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