Securities - Schedule of Fair Value of Available for Sale Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
AFS securities
Due in one year or less, Amortized Cost	$ 1,573	$ 213
Due in one year or less, Fair value	1,542	209
Due after one year to five years, Amortized Cost	803,533	651,654
Due after one year to five years, Fair value	735,119	603,469
Due after five to ten years, Amortized Cost	289,429	446,531
Due after five to ten years, Fair value	248,270	391,693
Due after ten years, Amortized Cost	3,984,518	4,063,506
Due after ten years, Fair value	3,302,654	3,412,150
Amortized Cost	5,079,053	5,161,904
Fair Value	4,287,585	4,407,521
HTM securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	136,819	80,014
Due after one year to five years, Fair value	122,886	72,952
Due after five to ten years, Amortized Cost	57,326	114,955
Due after five to ten years, Fair value	49,147	101,551
Due after ten years, Amortized Cost	249,688	254,752
Due after ten years, Fair value	221,157	230,319
Amortized Cost	443,833	449,721
Fair Value	393,190	404,822
Total
Due in one year or less, Amortized Cost	1,573	213
Due in one year or less, Fair value	1,542	209
Due after one year to five years, Amortized Cost	940,352	731,668
Due after one year to five years, Fair value	858,005	676,421
Due after five to ten years, Amortized Cost	346,755	561,486
Due after five to ten years, Fair value	297,417	493,244
Due after ten years, Amortized Cost	4,234,206	4,318,258
Due after ten years, Fair value	3,523,811	3,642,469
Amortized Cost	5,522,886	5,611,625
Fair Value	4,680,775	4,812,343
Government-sponsored residential mortgage-backed securities
AFS securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	30,954	29,288
Due after one year to five years, Fair value	29,662	28,188
Due after five to ten years, Amortized Cost	16,728	22,735
Due after five to ten years, Fair value	15,359	21,235
Due after ten years, Amortized Cost	3,181,429	3,250,142
Due after ten years, Fair value	2,638,606	2,731,215
Amortized Cost	3,229,111	3,302,165
Fair Value	2,683,627	2,780,638
HTM securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	0	0
Due after one year to five years, Fair value	0	0
Due after five to ten years, Amortized Cost	0	0
Due after five to ten years, Fair value	0	0
Due after ten years, Amortized Cost	249,688	254,752
Due after ten years, Fair value	221,157	230,319
Amortized Cost	249,688	254,752
Fair Value	221,157	230,319
Government-sponsored commercial mortgage-backed securities
AFS securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	405,958	256,229
Due after one year to five years, Fair value	366,117	234,725
Due after five to ten years, Amortized Cost	227,433	379,749
Due after five to ten years, Fair value	189,114	327,198
Due after ten years, Amortized Cost	682,495	690,051
Due after ten years, Fair value	551,552	562,453
Amortized Cost	1,315,886	1,326,029
Fair Value	1,106,783	1,124,376
HTM securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	136,819	80,014
Due after one year to five years, Fair value	122,886	72,952
Due after five to ten years, Amortized Cost	57,326	114,955
Due after five to ten years, Fair value	49,147	101,551
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	194,145	194,969
Fair Value	172,033	174,503
U.S. Agency bonds
AFS securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	236,761	236,454
Due after one year to five years, Fair value	215,238	216,011
Due after five to ten years, Amortized Cost	0	0
Due after five to ten years, Fair value	0	0
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	236,761	236,454
Fair Value	215,238	216,011
U.S. Treasury securities
AFS securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	99,610	99,552
Due after one year to five years, Fair value	95,085	95,152
Due after five to ten years, Amortized Cost	0	0
Due after five to ten years, Fair value	0	0
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	99,610	99,552
Fair Value	95,085	95,152
State and municipal bonds and obligations
AFS securities
Due in one year or less, Amortized Cost	1,573	213
Due in one year or less, Fair value	1,542	209
Due after one year to five years, Amortized Cost	30,250	30,131
Due after one year to five years, Fair value	29,017	29,393
Due after five to ten years, Amortized Cost	45,268	44,047
Due after five to ten years, Fair value	43,797	43,260
Due after ten years, Amortized Cost	120,594	123,313
Due after ten years, Fair value	112,496	118,482
Amortized Cost	197,685	197,704
Fair Value	$ 186,852	$ 191,344