Securities - Schedule of Fair Value Of Available For Sale Securities By Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
AFS securities
Due in one year or less, Amortized Cost	$ 6,938	$ 55,876
Due in one year or less, Fair value	6,892	55,593
Due after one year to five years, Amortized Cost	708,729	560,992
Due after one year to five years, Fair value	709,860	522,979
Due after five to ten years, Amortized Cost	112,058	335,084
Due after five to ten years, Fair value	105,649	296,864
Due after ten years, Amortized Cost	3,327,616	3,826,692
Due after ten years, Fair value	2,988,230	3,146,162
Amortized Cost	4,155,341	4,778,644
Fair Value	3,810,631	4,021,598
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	131,030	133,168
Due after one year to five years, Fair value	123,856	121,471
Due after five to ten years, Amortized Cost	84,129	55,838
Due after five to ten years, Fair value	79,608	47,982
Due after ten years, Amortized Cost	298,965	231,709
Due after ten years, Fair value	282,994	202,271
Amortized Cost	514,124	420,715
Fair Value	486,458	371,724
Total
Due in one year or less, Amortized Cost	6,938	55,876
Due in one year or less, Fair value	6,892	55,593
Due after one year to five years, Amortized Cost	839,759	694,160
Due after one year to five years, Fair value	833,716	644,450
Due after five to ten years, Amortized Cost	196,187	390,922
Due after five to ten years, Fair value	185,257	344,846
Due after ten years, Amortized Cost	3,626,581	4,058,401
Due after ten years, Fair value	3,271,224	3,348,433
Amortized Cost	4,669,465	5,199,359
Fair Value	4,297,089	4,393,322
Government-sponsored residential mortgage-backed securities
AFS securities
Due in one year or less, Amortized Cost	21	561
Due in one year or less, Fair value	21	557
Due after one year to five years, Amortized Cost	14,018	21,535
Due after one year to five years, Fair value	13,793	20,940
Due after five to ten years, Amortized Cost	10,845	13,212
Due after five to ten years, Fair value	10,256	12,268
Due after ten years, Amortized Cost	2,731,986	3,064,020
Due after ten years, Fair value	2,494,233	2,528,130
Amortized Cost	2,756,870	3,099,328
Fair Value	2,518,303	2,561,895
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	215,114	231,709
Due after ten years, Fair value	197,384	202,271
Amortized Cost	215,114	231,709
Fair Value	197,384	202,271
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	611,261	436,515
Due after one year to five years, Fair value	612,720	404,181
Due after five to ten years, Amortized Cost	49,331	270,546
Due after five to ten years, Fair value	44,354	235,853
Due after ten years, Amortized Cost	496,104	655,458
Due after ten years, Fair value	405,977	521,077
Amortized Cost	1,156,696	1,362,519
Fair Value	1,063,051	1,161,111
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	131,030	133,168
Due after one year to five years, Fair value	123,856	121,471
Due after five to ten years, Amortized Cost	55,129	55,838
Due after five to ten years, Fair value	49,538	47,982
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	186,159	189,006
Fair Value	173,394	169,453
U.S. Agency bonds
AFS securities
Due in one year or less, Amortized Cost		0
Due in one year or less, Fair value		0
Due after one year to five years, Amortized Cost		19,608
Due after one year to five years, Fair value		17,672
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		19,608
Fair Value		17,672
U.S. Treasury securities
AFS securities
Due in one year or less, Amortized Cost	0	49,947
Due in one year or less, Fair value	0	49,717
Due after one year to five years, Amortized Cost	50,034	49,837
Due after one year to five years, Fair value	50,326	47,902
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	50,034	99,784
Fair Value	50,326	97,619
State and municipal bonds and obligations
AFS securities
Due in one year or less, Amortized Cost	6,917	5,368
Due in one year or less, Fair value	6,871	5,319
Due after one year to five years, Amortized Cost	33,416	33,497
Due after one year to five years, Fair value	33,021	32,284
Due after five to ten years, Amortized Cost	51,882	51,326
Due after five to ten years, Fair value	51,039	48,743
Due after ten years, Amortized Cost	99,526	107,214
Due after ten years, Fair value	88,020	96,955
Amortized Cost	191,741	197,405
Fair Value	178,951	$ 183,301
HTM securities
Due in one year or less, Amortized Cost	0
Due in one year or less, Fair value	0
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	83,851
Due after ten years, Fair value	85,610
Amortized Cost	83,851
Fair Value	85,610
Corporate bonds
HTM securities
Due in one year or less, Amortized Cost	0
Due in one year or less, Fair value	0
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	29,000
Due after five to ten years, Fair value	30,070
Due after ten years, Amortized Cost	0
Due after ten years, Fair value	0
Amortized Cost	29,000
Fair Value	$ 30,070