Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Securities in an Unrealized Loss Position for Less than Twelve Months
Fair value, AFS and HTM	$ 1,218	$ 1,117
Unrealized losses, AFS and HTM	49	5
Securities in an Unrealized Loss Position for More than Twelve Months
Fair value, AFS and HTM	2,345,110	2,628,150
Unrealized losses, AFS and HTM	405,058	484,839
Total
Fair value, AFS and HTM	2,346,328	2,629,267
Unrealized losses, AFS and HTM	405,107	484,844
U.S. Treasuries
Securities in an Unrealized Loss Position for Less than Twelve Months
Fair value, AFS		0
Unrealized losses, AFS		0
Securities in an Unrealized Loss Position for More than Twelve Months
Fair value, AFS		172,570
Unrealized losses, AFS		2,215
Total
Fair Value, AFS		172,570
Unrealized losses, AFS		2,215
Government-sponsored enterprise securities
Securities in an Unrealized Loss Position for Less than Twelve Months
Fair value, AFS	0	0
Unrealized losses, AFS	0	0
Securities in an Unrealized Loss Position for More than Twelve Months
Fair value, AFS	62,872	60,266
Unrealized losses, AFS	9,096	11,698
Total
Fair Value, AFS	62,872	60,266
Unrealized losses, AFS	9,096	11,698
Mortgage-backed securities
Securities in an Unrealized Loss Position for Less than Twelve Months
Fair value, AFS and HTM	318	1,117
Unrealized losses, AFS and HTM	0	5
Securities in an Unrealized Loss Position for More than Twelve Months
Fair value, AFS and HTM	1,835,466	1,945,830
Unrealized losses, AFS and HTM	322,445	386,553
Total
Fair value, AFS and HTM	1,835,784	1,946,947
Unrealized losses, AFS and HTM	322,445	386,558
Corporate bonds
Securities in an Unrealized Loss Position for Less than Twelve Months
Fair value, AFS	380	0
Unrealized losses, AFS	49	0
Securities in an Unrealized Loss Position for More than Twelve Months
Fair value, AFS	13,654	17,008
Unrealized losses, AFS	346	917
Total
Fair Value, AFS	14,034	17,008
Unrealized losses, AFS	395	917
State and local governments
Securities in an Unrealized Loss Position for Less than Twelve Months
Fair value, HTM	520	0
Unrealized losses, HTM	0	0
Securities in an Unrealized Loss Position for More than Twelve Months
Fair value, HTM	433,118	432,476
Unrealized losses, HTM	73,171	83,456
Total
Fair value, HTM	433,638	432,476
Unrealized losses, HTM	$ 73,171	$ 83,456