Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS and HTM	$ 45,277	$ 478,793
Unrealized losses, AFS and HTM	1,539	33,147
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS and HTM	2,685,694	2,263,197
Unrealized losses, AFS and HTM	498,139	520,099
Total
Fair value, AFS and HTM	2,730,971	2,741,990
Unrealized losses, AFS and HTM	499,678	553,246
U.S. Treasuries
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS	0	168,758
Unrealized losses, AFS	0	5,662
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS	170,109	0
Unrealized losses, AFS	4,401	0
Total
Fair Value, AFS	170,109	168,758
Unrealized losses, AFS	4,401	5,662
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	59,304	57,456
Unrealized losses, AFS	12,655	14,501
Total
Fair Value, AFS	59,304	57,456
Unrealized losses, AFS	12,655	14,501
Mortgage-backed securities
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS and HTM	41,339	221,006
Unrealized losses, AFS and HTM	1,429	18,215
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS and HTM	2,013,372	1,835,958
Unrealized losses, AFS and HTM	389,870	405,557
Total
Fair value, AFS and HTM	2,054,711	2,056,964
Unrealized losses, AFS and HTM	391,299	423,772
Corporate bonds
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS	2,816	40,644
Unrealized losses, AFS	107	947
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS	13,908	886
Unrealized losses, AFS	1,093	114
Total
Fair Value, AFS	16,724	41,530
Unrealized losses, AFS	1,200	1,061
State and local governments
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, HTM	1,122	48,385
Unrealized losses, HTM	3	8,323
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, HTM	429,001	368,897
Unrealized losses, HTM	90,120	99,927
Total
Fair value, HTM	430,123	417,282
Unrealized losses, HTM	$ 90,123	$ 108,250