Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021		Mar. 31, 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		$ (17,525)		$ 16,740
Changes in fair value of available for sale debt securities, tax		(4,206)		3,934
Changes in fair value of available for sale debt securities		(13,319)		12,806
Change in fair value of cash flow hedges, before tax		109		(1,402)
Change in fair value of cash flow hedges, tax		26		(330)
Change in fair value of cash flow hedges		83		(1,072)
Net cash flow hedge losses reclassified into earnings, before tax		281	[1]	29	[2]
Net cash flow hedge losses reclassified into earnings, tax		67	[1]	7	[2]
Net cash flow hedge losses reclassified into earnings		214	[1]	22	[2]
Net change in fair value of cash flow hedges, before tax		390		(1,373)
Net change in fair value of cash flow hedges, tax		93		(323)
Net change in fair value of cash flow hedges		297		(1,050)
Amortization of net actuarial losses, before tax	[3]	545		536
Amortization of net actuarial losses, tax	[3]	138		126
Amortization of net actuarial losses	[3]	407		410
Total other comprehensive income (loss), before tax		(16,590)		15,903
Total other comprehensive income (loss), tax		(3,975)		3,737
Total other comprehensive income (loss), net of tax		$ (12,615)		$ 12,166

[1] The pre-tax amounts for the three months ended March 31, 2021 are included in interest expense on FHLB advances.

[2] The pre-tax amounts for the three months ended March 31, 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.