Securities - Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due within one year	$ 177,290
Due after one year but within five years	10,000
Due after five years but within ten years	78,135
Due after ten years	1,000
Mortgage-backed securities	2,323,674
Amortized Cost	2,590,099	$ 2,758,556
Fair Value
Due within one year	174,976
Due after one year but within five years	8,602
Due after five years but within ten years	67,018
Due after ten years	999
Mortgage-backed securities	1,937,784
Total securities	2,189,379	2,314,493
Amortized Cost
Due within one year	0
Due after one year but within five years	1,998
Due after five years but within ten years	129,097
Due after ten years	390,498
Mortgage-backed securities	12,085
Amortized Cost	533,678	541,700
Fair Value
Due within one year	0
Due after one year but within five years	1,797
Due after five years but within ten years	110,785
Due after ten years	325,594
Mortgage-backed securities	11,447
Total securities	$ 449,623	$ 432,528