Securities - Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due within one year	$ 25,078
Due after one year but within five years	176,932
Due after five years but within ten years	87,707
Due after ten years	1,000
Mortgage-backed securities	2,467,839
Amortized Cost	2,758,556	$ 2,662,481
Fair Value
Due within one year	25,036
Due after one year but within five years	171,224
Due after five years but within ten years	72,348
Due after ten years	885
Mortgage-backed securities	2,045,000
Total securities	2,314,493	2,630,414
Amortized Cost
Due within one year	0
Due after one year but within five years	997
Due after five years but within ten years	61,509
Due after ten years	464,044
Mortgage-backed securities	15,150
Amortized Cost	541,700	513,825
Fair Value
Due within one year	0
Due after one year but within five years	873
Due after five years but within ten years	50,726
Due after ten years	366,708
Mortgage-backed securities	14,221
Total securities	$ 432,528	$ 511,699