Securities - Summary Of Fair Value Of Securities By Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
AFS securities
Due in one year or less, Amortized Cost	$ 213	$ 1,512
Due in one year or less, Fair value	209	1,494
Due after one year to five years, Amortized Cost	651,654	1,211,778
Due after one year to five years, Fair value	603,469	1,074,080
Due after five to ten years, Amortized Cost	446,531	1,643,641
Due after five to ten years, Fair value	391,693	1,430,761
Due after ten years, Amortized Cost	4,063,506	4,968,504
Due after ten years, Fair value	3,412,150	4,184,443
Amortized Cost	5,161,904	7,825,435
Fair Value	4,407,521	6,690,778
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	80,014	0
Due after one year to five years, Fair value	72,952	0
Due after five to ten years, Amortized Cost	114,955	200,154
Due after five to ten years, Fair value	101,551	176,883
Due after ten years, Amortized Cost	254,752	276,493
Due after ten years, Fair value	230,319	246,343
Amortized Cost	449,721	476,647
Fair Value	404,822	423,226
Total
Due in one year or less, Amortized Cost	213	1,512
Due in one year or less, Fair value	209	1,494
Due after one year to five years, Amortized Cost	731,668	1,211,778
Due after one year to five years, Fair value	676,421	1,074,080
Due after five to ten years, Amortized Cost	561,486	1,843,795
Due after five to ten years, Fair value	493,244	1,607,644
Due after ten years, Amortized Cost	4,318,258	5,244,997
Due after ten years, Fair value	3,642,469	4,430,786
Amortized Cost	5,611,625	8,302,082
Fair Value	4,812,343	7,114,004
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	29,288	21,221
Due after one year to five years, Fair value	28,188	20,284
Due after five to ten years, Amortized Cost	22,735	727,908
Due after five to ten years, Fair value	21,235	648,132
Due after ten years, Amortized Cost	3,250,142	4,106,634
Due after ten years, Fair value	2,731,215	3,443,492
Amortized Cost	3,302,165	4,855,763
Fair Value	2,780,638	4,111,908
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	254,752	276,493
Due after ten years, Fair value	230,319	246,343
Amortized Cost	254,752	276,493
Fair Value	230,319	246,343
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	256,229	191,762
Due after one year to five years, Fair value	234,725	171,992
Due after five to ten years, Amortized Cost	379,749	649,659
Due after five to ten years, Fair value	327,198	556,641
Due after ten years, Amortized Cost	690,051	728,698
Due after ten years, Fair value	562,453	620,321
Amortized Cost	1,326,029	1,570,119
Fair Value	1,124,376	1,348,954
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	80,014	0
Due after one year to five years, Fair value	72,952	0
Due after five to ten years, Amortized Cost	114,955	200,154
Due after five to ten years, Fair value	101,551	176,883
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	194,969	200,154
Fair Value	174,503	176,883
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	236,454	877,371
Due after one year to five years, Fair value	216,011	767,464
Due after five to ten years, Amortized Cost	0	223,520
Due after five to ten years, Fair value	0	185,018
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	236,454	1,100,891
Fair Value	216,011	952,482
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	99,552	99,324
Due after one year to five years, Fair value	95,152	93,057
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	99,552	99,324
Fair Value	95,152	93,057
State and municipal bonds and obligations
AFS securities
Due in one year or less, Amortized Cost	213	213
Due in one year or less, Fair value	209	209
Due after one year to five years, Amortized Cost	30,131	22,100
Due after one year to five years, Fair value	29,393	21,283
Due after five to ten years, Amortized Cost	44,047	42,554
Due after five to ten years, Fair value	43,260	40,970
Due after ten years, Amortized Cost	123,313	133,172
Due after ten years, Fair value	118,482	120,630
Amortized Cost	197,704	198,039
Fair Value	$ 191,344	183,092
Other debt securities
AFS securities
Due in one year or less, Amortized Cost		1,299
Due in one year or less, Fair value		1,285
Due after one year to five years, Amortized Cost		0
Due after one year to five years, Fair value		0
Due after five to ten years, Amortized Cost		0
Due after five to ten years, Fair value		0
Due after ten years, Amortized Cost		0
Due after ten years, Fair value		0
Amortized Cost		1,299
Fair Value		$ 1,285