CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 223,786	$ 222,089	$ 205,531
Unrealized gain (loss) on securities available-for-sale:
Unrealized holding gain (loss) arising during the period	70,084	(371,299)	(30,042)
Reclassification adjustment for (gain) loss included in net income	6,930	(1,194)	(5,674)
Tax effect	(16,173)	78,224	7,502
Net of tax	60,841	(294,269)	(28,214)
Unrealized gain (loss) on cash flow hedges:
Unrealized holding gain (loss) arising during the period	(179)	479	138
Reclassification adjustment for (gain) loss included in net income	15	521	1,044
Tax effect	34	(210)	(248)
Net of tax	(130)	790	934
Net gain (loss) arising during the period
Net gain (loss) arising during the period	3,045	(1,076)	9,482
Reclassification adjustment for amortization of prior service cost	82	82	84
Tax effect	(657)	209	(2,009)
Net of tax	2,470	(785)	7,557
Total other comprehensive income (loss), net of tax	63,181	(294,264)	(19,723)
Comprehensive income (loss)	$ 286,967	$ (72,175)	$ 185,808