Fair Value Measurements (Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance		$ 179,968	$ 149,390
Total gains or losses (realized/unrealized) included in earnings		24,299	43,833
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	[1]	57	(148)
Investment securities called		(1,000)	0
Discount accretion		49	(5)
Purchases of private equity securities		15,220	12,281
Sale / paydown of private equity securities		(41,341)	25,437
Capitalized interest/dividends		362	(44)
Ending balance		177,614	179,968
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		24,799	35,333
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		$ 35	(148)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Investment securities gains (losses), net
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]		Net unrealized gains (losses) on other securities
State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance		$ 1,841	1,984
Total gains or losses (realized/unrealized) included in earnings		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	[1]	57	(148)
Investment securities called		(1,000)	0
Discount accretion		49	5
Purchases of private equity securities		0	0
Sale / paydown of private equity securities		0	0
Capitalized interest/dividends		0	0
Ending balance		947	1,841
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		0	0
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		35	(148)
Private Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance		178,127	147,406
Total gains or losses (realized/unrealized) included in earnings		24,299	43,833
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	[1]	0	0
Investment securities called		0	0
Discount accretion		0	0
Purchases of private equity securities		15,220	12,281
Sale / paydown of private equity securities		(41,341)	(25,437)
Capitalized interest/dividends		362	44
Ending balance		176,667	178,127
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		24,799	35,333
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		$ 0	$ 0

[1] * Included in "net unrealized gains (losses) on securities" in the consolidated statements of comprehensive income.