Investment Securities, Securities Held-to-Maturity (Details) - USD ($) $ in Thousands		Jun. 30, 2024		Dec. 31, 2023		Dec. 31, 2022
Book Values, Estimated Fair Values and Unrealized Gains and Losses of Investments Classified as Held-to-maturity [Abstract]
Amortized cost		$ 794,797		$ 817,688
Gross unrecognized gains		48		137
Gross unrecognized losses		156,127		146,240
Fair value		638,718		671,585
Allowance for credit losses		450		450		$ 393
Mortgage-backed Securities [Member]
Book Values, Estimated Fair Values and Unrealized Gains and Losses of Investments Classified as Held-to-maturity [Abstract]
Amortized cost	[1]	646,404		664,728
Gross unrecognized gains	[1]	0		30
Gross unrecognized losses	[1]	141,259		132,043
Fair value	[1]	505,145		532,715
Allowance for credit losses		0	[1]	0	[1]	0
Collateralized Mortgage Obligations [Member]
Book Values, Estimated Fair Values and Unrealized Gains and Losses of Investments Classified as Held-to-maturity [Abstract]
Amortized cost	[1]	71,182		74,170
Gross unrecognized gains	[1]	0		0
Gross unrecognized losses	[1]	14,306		14,017
Fair value	[1]	56,876		60,153
Allowance for credit losses		0	[1]	0	[1]	0
Municipal Securities [Member]
Book Values, Estimated Fair Values and Unrealized Gains and Losses of Investments Classified as Held-to-maturity [Abstract]
Amortized cost		77,211		78,790
Gross unrecognized gains		48		107
Gross unrecognized losses		562		180
Fair value		76,697		78,717
Allowance for credit losses		$ 450		$ 450		$ 393

[1] All mortgage-backed securities and collateralized mortgage obligations were issued by an agency or government sponsored entity of the U.S. Government.