CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 23,401	$ 24,278
Change in available-for-sale and transferred securities:
Unrealized holding gain (loss) on securities available-for-sale arising during the period	(15,389)	26,793
Reclassification adjust for amortization of unrealized losses on securities transferred to held-to-maturity	496	491
Reclassification adjustment for (gains) losses included in net income	46	(16)
Net securities gain (loss) activity during the period	(14,847)	27,268
Tax effect	3,118	(5,726)
Net of tax amount	(11,729)	21,542
Defined benefit pension plans:
Amortization of net actuarial loss	15	15
Net gain activity during the period	15	15
Tax effect	(4)	(4)
Net of tax amount	11	11
Total other comprehensive income (loss), net of tax	(11,718)	21,553
Comprehensive income	$ 11,683	$ 45,831