Accumulated Other Comprehensive Income (Loss) (Components of unrealized holding gains on AFS securities) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on AFS securities arising during the period		$ (6,708)	$ (22,815)	$ (5,736)	$ (56,413)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	0	67	0
Tax effect	[1]	1,394	4,788	1,266	11,687
Unrealized gains (losses), net of tax		(5,314)	(18,027)	(4,537)	(44,726)
Unrealized Holding Gains (Losses) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on AFS securities arising during the period		(6,708)	(22,815)	(5,736)	(56,413)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	0	(67)	0
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax		(6,708)	(22,815)	(5,803)	(56,413)
Tax effect		1,394	4,788	1,266	11,687
Unrealized gains (losses), net of tax		(5,314)	(18,027)	(4,537)	(44,726)
Unrealized Holding Gains (Losses) on AFS Securities [Member] | Auction Rate Money Market Preferred and Preferred Stocks [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on AFS securities arising during the period		(67)	(18)	228	(763)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	0	0	0
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax		(67)	(18)	228	(763)
Tax effect		0	0	0	0
Unrealized gains (losses), net of tax		(67)	(18)	228	(763)
Unrealized Holding Gains (Losses) on AFS Securities [Member] | All Other AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on AFS securities arising during the period		(6,641)	(22,797)	(5,964)	(55,650)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	0	(67)	0
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax		(6,641)	(22,797)	(6,031)	(55,650)
Tax effect		1,394	4,788	1,266	11,687
Unrealized gains (losses), net of tax		(5,247)	(18,009)	(4,765)	(43,963)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses), net of tax		$ 0	$ 0	$ 0	$ 0

[1] See “Note 9 – Accumulated Other Comprehensive Income” for tax effect reconciliation.