Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Changes in fair value of available for sale debt securities, before tax		$ (43,139)		$ (61,931)		$ (38,703)		$ (174,302)
Changes in fair value of available for sale debt securities, tax		10,354		14,864		9,289		41,833
Changes in fair value of available for sale debt securities, net of tax		(32,785)		(47,067)		(29,414)		(132,469)
Changes in fair value of cash flow hedges, before tax		2,196		(10,250)		4,938		(27,394)
Changes in fair value of cash flow hedges, tax		(527)		2,460		(1,185)		6,574
Change in fair value of cash flow hedges , net of tax		1,669		(7,790)		3,753		(20,820)
Net cash flow hedge (gains) losses reclassified into earnings, before tax		1,533	[1]	1,075	[1]	6,043	[2]	709	[2]
Net cash flow hedge (gains) losses reclassified into earnings, tax		(369)		(258)		(1,451)		(170)
Net cash flow hedge (gains) losses reclassified into earnings, net of tax		1,164		817		4,592		539
Net change in fair value of cash flow hedges, before tax		3,729		(9,175)		10,981		(26,685)
Net change in fair value of cash flow hedges, tax		(896)		2,202		(2,636)		6,404
Net change in fair value of cash flow hedges, net of tax		2,833		(6,973)		8,345		(20,281)
Amortization of net actuarial losses, before tax	[3]	59		428		178		1,284
Amortization of net actuarial losses, tax		(14)		(102)		(43)		(308)
Amortization of net actuarial losses, net of tax		45		326		135		976
Total other comprehensive income (loss), before tax		(39,351)		(70,678)		(27,544)		(199,703)
Total other comprehensive income (loss), tax		9,444		16,964		6,610		47,929
Net other comprehensive income (loss)		(29,907)		(53,714)		(20,934)		(151,774)
Interest Income
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Net cash flow hedge (gains) losses reclassified into earnings, before tax		2,200		1,100		7,100		561
Interest Expense
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Net cash flow hedge (gains) losses reclassified into earnings, before tax		$ (631)		$ (3)		$ (1,000)		$ 148

[1] For the three months ended September 30, 2023 and 2022, the pre-tax amounts reclassified into earnings in the Unaudited Consolidated Statements of Income include reductions of $2.2 million and $1.1 million, respectively, in interest and fees on loans, as well as reductions of $631 thousand and $3 thousand, respectively, in FHLB interest expense.

[2] For the nine months ended September 30, 2023 and 2022, the pre-tax amounts reclassified into earnings in the Unaudited Consolidated Statements of Income include reductions of $7.1 million and $561 thousand, respectively, in interest and fees on loans, as well as a reduction of $1.0 million and an increase of $148 thousand, respectively, in FHLB interest expense.

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