Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS and HTM	$ 5,722	$ 1,117
Unrealized losses, AFS and HTM	137	5
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS and HTM	2,288,497	2,628,150
Unrealized losses, AFS and HTM	502,121	484,839
Total
Fair value, AFS and HTM	2,294,219	2,629,267
Unrealized losses, AFS and HTM	502,258	484,844
U.S. Treasuries
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS	0	0
Unrealized losses, AFS	0	0
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS	0	172,570
Unrealized losses, AFS	0	2,215
Total
Fair Value, AFS	0	172,570
Unrealized losses, AFS	0	2,215
Government-sponsored enterprise securities
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS	0	0
Unrealized losses, AFS	0	0
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS	60,127	60,266
Unrealized losses, AFS	11,840	11,698
Total
Fair Value, AFS	60,127	60,266
Unrealized losses, AFS	11,840	11,698
Mortgage-backed securities
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS and HTM	190	1,117
Unrealized losses, AFS and HTM	1	5
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS and HTM	1,796,740	1,945,830
Unrealized losses, AFS and HTM	398,060	386,553
Total
Fair value, AFS and HTM	1,796,930	1,946,947
Unrealized losses, AFS and HTM	398,061	386,558
Corporate bonds
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS	375	0
Unrealized losses, AFS	51	0
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS	15,716	17,008
Unrealized losses, AFS	785	917
Total
Fair Value, AFS	16,091	17,008
Unrealized losses, AFS	836	917
State and local governments
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, HTM	5,157	0
Unrealized losses, HTM	85	0
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, HTM	415,914	432,476
Unrealized losses, HTM	91,436	83,456
Total
Fair value, HTM	421,071	432,476
Unrealized losses, HTM	$ 91,521	$ 83,456