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Loans Held-for-Investment and Allowance for Loan Losses - Schedule of Company's Internal Ratings of its Loans Held-for-Investment, Including The Year of Origination, by Portfolio Segments (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 $ 1,888 $ 3,094 $ 2,533
2022 2,344 1,449 1,697
2021 1,155 650 712
2020 558 312 336
2019 256 220 238
Prior 645 567 604
Revolving Loans Amortized Cost Basis 149 150 136
Total 6,995 6,442 6,256
Charge-Off [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2022 1    
2021 1    
Total 2    
C&I [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 533 644 507
2022 392 163 233
2021 97 56 68
2020 42 24 26
2019 18 17 21
Prior 26 13 16
Total 1,108 917 871
C&I [Member] | Charge-Off [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1    
Municipal [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 20 79 67
2022 83 19 21
2021 17 15 16
2020 14 4 5
2019 2 20 20
Prior 82 84 86
Total 218 221 215
Agriculture [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 43 60 46
2022 31 10 22
2021 5 3 4
2020 2 2 3
2019 1 1 1
Prior   1 1
Total 82 77 77
Construction & Development [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 388 643 508
2022 408 219 320
2021 95 70 78
2020 22 13 15
2019 10 8 8
Prior 7 7 9
Total 930 960 938
Farm [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 83 148 102
2022 117 85 89
2021 76 32 33
2020 30 11 12
2019 9 8 8
Prior 26 22 24
Total 341 306 268
Non-Owner Occupied CRE [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 135 266 228
2022 245 193 202
2021 184 102 109
2020 123 62 64
2019 58 22 23
Prior 84 87 92
Total 829 732 718
Owner Occupied CRE [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 85 318 281
2022 326 226 226
2021 237 130 137
2020 118 84 88
2019 72 72 78
Prior 165 124 136
Total 1,003 954 946
Residential [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 372 520 437
2022 450 361 387
2021 331 177 189
2020 170 84 69
2019 72 65 89
Prior 252 226 236
Revolving Loans Amortized Cost Basis 142 143 129
Total 1,789 1,576 1,536
Auto [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 168 331 284
2022 238 131 149
2021 87 56 65
2020 32 25 30
2019 13 6 8
Prior 2 2 3
Total 540 551 539
Auto [Member] | Charge-Off [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2022 1    
Total 1    
Non-Auto [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 61 85 73
2022 54 42 48
2021 26 9 13
2020 5 3 4
2019 1 1 2
Prior 1 1 1
Revolving Loans Amortized Cost Basis 7 7 7
Total 155 148 148
Pass [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 1,853 3,054 2,506
2022 2,310 1,430 1,676
2021 1,131 637 698
2020 539 285 311
2019 231 208 222
Prior 606 531 566
Revolving Loans Amortized Cost Basis 146 146 133
Total 6,816 6,291 6,112
Pass [Member] | C&I [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 524 627 495
2022 386 157 226
2021 94 52 65
2020 40 22 24
2019 16 16 18
Prior 24 13 16
Total 1,084 887 844
Pass [Member] | Municipal [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 20 79 67
2022 83 19 21
2021 16 15 16
2020 14 4 5
2019 2 20 20
Prior 82 84 86
Total 217 221 215
Pass [Member] | Agriculture [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 42 60 46
2022 30 9 21
2021 5 3 4
2020 2 2 3
2019 1 1 1
Prior   1 1
Total 80 76 76
Pass [Member] | Construction & Development [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 373 638 504
2022 401 218 317
2021 94 70 78
2020 22 13 15
2019 10 8 8
Prior 7 7 9
Total 907 954 931
Pass [Member] | Farm [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 83 147 101
2022 116 85 89
2021 75 32 33
2020 25 11 12
2019 9 8 8
Prior 25 21 23
Total 333 304 266
Pass [Member] | Non-Owner Occupied CRE [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 134 258 223
2022 240 191 200
2021 182 100 108
2020 116 49 51
2019 45 21 22
Prior 75 75 79
Total 792 694 683
Pass [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 81 316 280
2022 320 224 223
2021 228 128 134
2020 118 74 81
2019 64 63 67
Prior 149 113 124
Total 960 918 909
Pass [Member] | Residential [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 368 513 433
2022 443 355 382
2021 325 173 183
2020 165 82 68
2019 70 64 87
Prior 241 214 224
Revolving Loans Amortized Cost Basis 139 139 126
Total 1,751 1,540 1,503
Pass [Member] | Auto [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 168 331 284
2022 237 131 149
2021 86 55 64
2020 32 25 29
2019 13 6 8
Prior 2 2 3
Total 538 550 537
Pass [Member] | Non-Auto [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 60 85 73
2022 54 41 48
2021 26 9 13
2020 5 3 4
2019 1 1 2
Prior 1 1 1
Revolving Loans Amortized Cost Basis 7 7 7
Total 154 147 148
Special Mention [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 15 7 1
2022 11 5 6
2021 8 6 5
2020 2 20 16
2019 15 0  
Prior 5 11 11
Revolving Loans Amortized Cost Basis 1 1  
Total 57 50 39
Special Mention [Member] | C&I [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 7 4 1
2022 1 1 0
2021   2  
2020   1 1
2019 1    
Total 9 8 2
Special Mention [Member] | Construction & Development [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 7 1  
2022 4   2
Total 11 1 2
Special Mention [Member] | Non-Owner Occupied CRE [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2022 4 1 1
2021 1 1  
2020   11 11
2019 11    
Prior 2 7 7
Total 18 20 19
Special Mention [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 1 1  
2022   0 1
2021 5 1 2
2020   8 4
2019 3    
Prior   1 1
Total 9 11 8
Special Mention [Member] | Residential [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023   1  
2022 2 3 2
2021 2 2 3
2020 2    
2019   0  
Prior 3 3 3
Revolving Loans Amortized Cost Basis 1 1  
Total 10 10 8
Substandard [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 20 33 26
2022 23 14 15
2021 16 7 9
2020 17 7 9
2019 10 12 16
Prior 34 25 27
Revolving Loans Amortized Cost Basis 2 3 3
Total 122 101 105
Substandard [Member] | C&I [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 2 13 11
2022 5 5 7
2021 3 2 3
2020 2 1 1
2019 1 1 3
Prior 2    
Total 15 22 25
Substandard [Member] | Municipal [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2021 1    
Total 1    
Substandard [Member] | Agriculture [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 1    
2022 1 1 1
Total 2 1 1
Substandard [Member] | Construction & Development [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 8 4 4
2022 3 1 1
2021 1    
Total 12 5 5
Substandard [Member] | Farm [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023   1 1
2022 1    
2021 1    
2020 5    
Prior 1 1 1
Total 8 2 2
Substandard [Member] | Non-Owner Occupied CRE [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 1 8 5
2022 1 1 1
2021 1 1 1
2020 7 2 2
2019 2 1 1
Prior 7 5 6
Total 19 18 16
Substandard [Member] | Owner Occupied CRE [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 3 1 1
2022 6 2 2
2021 4 1 1
2020   2 3
2019 5 9 11
Prior 16 10 11
Total 34 25 29
Substandard [Member] | Residential [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 4 6 4
2022 5 3 3
2021 4 2 3
2020 3 2 1
2019 2 1 2
Prior 8 9 9
Revolving Loans Amortized Cost Basis 2 3 3
Total 28 26 25
Substandard [Member] | Auto [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2022 1    
2021 1 1 1
2020     1
Total 2 1 $ 2
Substandard [Member] | Non-Auto [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 1    
2022   1  
Total $ 1 $ 1