Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Changes in fair value of available for sale debt securities, before tax		$ (65,078)	$ (17,525)
Changes in fair value of available for sale debt securities, tax		(15,618)	(4,206)
Changes in fair value of available for sale debt securities, net of tax		(49,460)	(13,319)
Changes in fair value of cash flow hedges, before tax		(13,201)	109
Changes in fair value of cash flow hedges, tax		(3,168)	26
Change in fair value of cash flow hedges , net of tax		(10,033)	83
Net cash flow hedge (gains) losses reclassified into earnings, before tax	[1]	(399)	281
Net cash flow hedge (gains) losses reclassified into earnings, tax		(97)	67
Net cash flow hedge (gains) losses reclassified into earnings, net of tax		(302)	214
Net change in fair value of cash flow hedges, before tax		(13,600)	390
Net change in fair value of cash flow hedges, tax		(3,265)	93
Net change in fair value of cash flow hedges, net of tax		(10,335)	297
Amortization of net actuarial losses, before tax	[2]	428	545
Amortization of net actuarial losses, tax		103	138
Amortization of net actuarial losses, net of tax		325	407
Total other comprehensive income (loss), before tax		(78,250)	(16,590)
Total other comprehensive income (loss), tax		(18,780)	(3,975)
Total other comprehensive income (loss), net of tax		$ (59,470)	$ (12,615)

[1] The pre-tax amounts for the three months ended March 31, 2022 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 are included in other expenses in the Unaudited Consolidated Statements of Income.