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Securities - Summary Of Fair Value Of Available For Sale Securities By Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
AFS securities    
Due in one year or less, Amortized Cost $ 210 $ 1,512
Due in one year or less, Fair value 210 1,494
Due after one year to five years, Amortized Cost 547,133 1,211,778
Due after one year to five years, Fair value 492,216 1,074,080
Due after five to ten years, Amortized Cost 556,573 1,643,641
Due after five to ten years, Fair value 470,867 1,430,761
Due after ten years, Amortized Cost 4,153,348 4,968,504
Due after ten years, Fair value 3,298,225 4,184,443
Amortized Cost 5,257,264 7,825,435
Fair Value 4,261,518 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 0 0
Due after one year to five years, Fair value 0 0
Due after five to ten years, Amortized Cost 195,629 200,154
Due after five to ten years, Fair value 168,106 176,883
Due after ten years, Amortized Cost 260,271 276,493
Due after ten years, Fair value 219,548 246,343
Amortized Cost 455,900 476,647
Fair Value 387,654 423,226
Total    
Due in one year or less, Amortized Cost 210 1,512
Due in one year or less, Fair value 210 1,494
Due after one year to five years, Amortized Cost 547,133 1,211,778
Due after one year to five years, Fair value 492,216 1,074,080
Due after five to ten years, Amortized Cost 752,202 1,843,795
Due after five to ten years, Fair value 638,973 1,607,644
Due after ten years, Amortized Cost 4,413,619 5,244,997
Due after ten years, Fair value 3,517,773 4,430,786
Amortized Cost 5,713,164 8,302,082
Fair Value 4,649,172 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 27,697 21,221
Due after one year to five years, Fair value 26,351 20,284
Due after five to ten years, Amortized Cost 28,637 727,908
Due after five to ten years, Fair value 26,316 648,132
Due after ten years, Amortized Cost 3,324,129 4,106,634
Due after ten years, Fair value 2,647,963 3,443,492
Amortized Cost 3,380,463 4,855,763
Fair Value 2,700,630 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 260,271 276,493
Due after ten years, Fair value 219,548 246,343
Amortized Cost 260,271 276,493
Fair Value 219,548 246,343
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 164,329 191,762
Due after one year to five years, Fair value 145,815 171,992
Due after five to ten years, Amortized Cost 475,624 649,659
Due after five to ten years, Fair value 398,011 556,641
Due after ten years, Amortized Cost 703,234 728,698
Due after ten years, Fair value 545,294 620,321
Amortized Cost 1,343,187 1,570,119
Fair Value 1,089,120 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 0 0
Due after one year to five years, Fair value 0 0
Due after five to ten years, Amortized Cost 195,629 200,154
Due after five to ten years, Fair value 168,106 176,883
Due after ten years, Amortized Cost 0 0
Due after ten years, Fair value 0 0
Amortized Cost 195,629 200,154
Fair Value 168,106 176,883
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 226,493 877,371
Due after one year to five years, Fair value 199,833 767,464
Due after five to ten years, Amortized Cost 9,656 223,520
Due after five to ten years, Fair value 8,132 185,018
Due after ten years, Amortized Cost 0 0
Due after ten years, Fair value 0 0
Amortized Cost 236,149 1,100,891
Fair Value 207,965 952,482
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 99,494 99,324
Due after one year to five years, Fair value 93,219 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 99,494 99,324
Fair Value 93,219 93,057
State and municipal bonds and obligations    
AFS securities    
Due in one year or less, Amortized Cost 210 213
Due in one year or less, Fair value 210 209
Due after one year to five years, Amortized Cost 29,120 22,100
Due after one year to five years, Fair value 26,998 21,283
Due after five to ten years, Amortized Cost 42,656 42,554
Due after five to ten years, Fair value 38,408 40,970
Due after ten years, Amortized Cost 125,985 133,172
Due after ten years, Fair value 104,968 120,630
Amortized Cost 197,971 198,039
Fair Value $ 170,584 183,092
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