Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Securities in an Unrealized Loss Position for Less than 12 Months
Fair Value, AFS and HTM	$ 2,023,736	$ 555,070
Unrealized Losses, AFS and HTM	30,297	2,348
Securities in an Unrealized Loss Position for More than 12 Months
Fair Value, AFS and HTM	487,570	7,003
Unrealized Losses, AFS and HTM	18,031	332
Total
Fair Value, AFS and HTM	2,511,306	562,073
Unrealized Losses, AFS and HTM	48,328	2,680
Government-sponsored enterprise securities
Securities in an Unrealized Loss Position for Less than 12 Months
Fair Value, AFS	21,436	29,812
Unrealized Losses, AFS	522	181
Securities in an Unrealized Loss Position for More than 12 Months
Fair Value, AFS	47,743	0
Unrealized Losses, AFS	2,250	0
Total
Fair Value, AFS	69,179	29,812
Unrealized Losses, AFS	2,772	181
Mortgage-backed securities
Securities in an Unrealized Loss Position for Less than 12 Months
Fair Value, AFS and HTM	1,773,022	497,992
Unrealized Losses, AFS and HTM	25,977	1,957
Securities in an Unrealized Loss Position for More than 12 Months
Fair Value, AFS and HTM	404,484	6,168
Unrealized Losses, AFS and HTM	13,857	167
Total
Fair Value, AFS and HTM	2,177,506	504,160
Unrealized Losses, AFS and HTM	39,834	2,124
Corporate bonds
Securities in an Unrealized Loss Position for Less than 12 Months
Fair Value, AFS	999	3,956
Unrealized Losses, AFS	1	45
Securities in an Unrealized Loss Position for More than 12 Months
Fair Value, AFS	945	835
Unrealized Losses, AFS	55	165
Total
Fair Value, AFS	1,944	4,791
Unrealized Losses, AFS	56	210
State and local governments
Securities in an Unrealized Loss Position for Less than 12 Months
Fair Value, HTM	228,279	23,310
Unrealized Losses, HTM	3,797	165
Securities in an Unrealized Loss Position for More than 12 Months
Fair Value, HTM	34,398	0
Unrealized Losses, HTM	1,869	0
Total
Fair Value, HTM	262,677	23,310
Unrealized Losses, HTM	$ 5,666	$ 165