CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 4,747	$ 33,044	$ 33,910	$ 66,723
Net unrealized holding gains/(losses) on marketable securities:
Unrealized holding losses, net of tax of $168, $3,771, $1,926 and $463, respectively	(3,391)	(17,719)	(9,089)	(4,702)
Reclassification adjustment for losses included in net income, net of tax of ($7,706), ($1,731), ($7,706) and ($1,731), respectively	26,789	5,636	26,789	5,636
Net unrealized holding gains/(losses) on marketable securities	23,398	(12,083)	17,700	934
Change in fair value of interest rate swaps, net of tax of ($96), ($508), ($726) and ($508), respectively	330	1,737	2,484	1,737
Defined benefit plan:
Actuarial reclassification adjustments for prior period service costs and actuarial gains included in net income, net of tax of $147, $152, $294 and $304, respectively	(388)	(382)	(776)	(764)
Other comprehensive income/(loss)	23,340	(10,728)	19,408	1,907
Total comprehensive income	$ 28,087	$ 22,316	$ 53,318	$ 68,630