CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/ (LOSS) - 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	$ 22,807	$ 24,745	$ 43,179	$ 75,998
Investments available-for-sale:
Net change in unrealized gains/ (losses) on investments available-for-sale	719	(13,609)	(6,984)	7,175
Related income tax (expense)/ benefit	(182)	3,466	1,772	(1,828)
Net investment gains reclassified into earnings	0	0	0	0
Related income tax expense	0	0	0	0
Net effect on other comprehensive income/ (loss)	537	(10,143)	(5,212)	5,347
Investments held-to-maturity:
Amortization of unrealized loss transferred from investments available-for-sale	365	458	736	863
Related income tax benefit	(93)	(117)	(187)	(220)
Net effect on other comprehensive income/ (loss)	272	341	549	643
Defined benefit pension plan:
Amortization of net loss	0	226	0	451
Related income tax benefit	0	(58)	0	(115)
Net effect on other comprehensive income/ (loss)	0	168	0	336
Total other comprehensive income/ (loss)	809	(9,634)	(4,663)	6,326
Comprehensive income	$ 23,616	$ 15,111	$ 38,516	$ 82,324