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Loans And Allowance For Credit Losses - Schedule of Company's Internal Ratings of its Loans Held-for-Investment, Including The Year of Origination, by Portfolio Segments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]    
2023 $ 2,531,000 $ 3,094,000
2022 2,036,000 1,449,000
2021 1,062,000 650,000
2020 518,000 312,000
2019 240,000 220,000
Prior 613,000 567,000
Revolving Loans Amort Cost Basis 149,000 150,000
Total Past Due 7,149,000 6,442,000
Charge off [Member]    
Financing Receivable Recorded Investment [Line Items]    
2022 1,000  
2021 1,000  
Total Past Due 2,000  
Agricultural [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 64,000 60,000
2022 15,000 10,000
2021 4,000 3,000
2020 1,000 2,000
2019 1,000 1,000
Prior   1,000
Total Past Due 85,000 77,000
Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 2,488,000 3,054,000
2022 2,007,000 1,430,000
2021 1,041,000 637,000
2020 499,000 285,000
2019 214,000 208,000
Prior 578,000 531,000
Revolving Loans Amort Cost Basis 145,000 146,000
Total Past Due 6,972,000 6,291,000
Pass [Member] | Agricultural [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 63,000 60,000
2022 15,000 9,000
2021 4,000 3,000
2020 1,000 2,000
2019 1,000 1,000
Prior   1,000
Total Past Due 84,000 76,000
Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 11,000 7,000
2022 11,000 5,000
2021 7,000 6,000
2020 2,000 20,000
2019 2,000  
Prior 6,000 11,000
Revolving Loans Amort Cost Basis 1,000 1,000
Total Past Due 40,000 50,000
Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 32,000 33,000
2022 18,000 14,000
2021 14,000 7,000
2020 17,000 7,000
2019 24,000 12,000
Prior 29,000 25,000
Revolving Loans Amort Cost Basis 3,000 3,000
Total Past Due 137,000 101,000
Substandard [Member] | Agricultural [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 1,000  
2022   1,000
Total Past Due 1,000 1,000
C&I [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 733,000 644,000
2022 279,000 163,000
2021 75,000 56,000
2020 37,000 24,000
2019 16,000 17,000
Prior 25,000 13,000
Revolving Loans Amort Cost Basis 0  
Total Past Due 1,165,000 917,000
C&I [Member] | Charge off [Member]    
Financing Receivable Recorded Investment [Line Items]    
2021 1,000  
Total Past Due 1,000  
C&I [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 720,000 627,000
2022 276,000 157,000
2021 73,000 52,000
2020 36,000 22,000
2019 14,000 16,000
Prior 23,000 13,000
Revolving Loans Amort Cost Basis 0  
Total Past Due 1,142,000 887,000
C&I [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 1,000 4,000
2022 1,000 1,000
2021 0 2,000
2020 0 1,000
2019 1,000  
Prior 0  
Revolving Loans Amort Cost Basis 0  
Total Past Due 3,000 8,000
C&I [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 12,000 13,000
2022 2,000 5,000
2021 2,000 2,000
2020 1,000 1,000
2019 1,000 1,000
Prior 2,000  
Revolving Loans Amort Cost Basis 0  
Total Past Due 20,000 22,000
Muncipal [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 25,000 79,000
2022 83,000 19,000
2021 16,000 15,000
2020 10,000 4,000
2019 1,000 20,000
Prior 80,000 84,000
Total Past Due 215,000 221,000
Muncipal [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 25,000 79,000
2022 83,000 19,000
2021 15,000 15,000
2020 10,000 4,000
2019 1,000 20,000
Prior 80,000 84,000
Total Past Due 214,000 221,000
Muncipal [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2021 1,000  
Total Past Due 1,000  
Construction & Development [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 532,000 643,000
2022 317,000 219,000
2021 79,000 70,000
2020 20,000 13,000
2019 9,000 8,000
Prior 6,000 7,000
Total Past Due 963,000 960,000
Construction & Development [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 515,000 638,000
2022 311,000 218,000
2021 78,000 70,000
2020 20,000 13,000
2019 9,000 8,000
Prior 6,000 7,000
Total Past Due 939,000 954,000
Construction & Development [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 8,000 1,000
2022 2,000  
Total Past Due 10,000 1,000
Construction & Development [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 9,000 4,000
2022 4,000 1,000
2021 1,000  
Total Past Due 14,000 5,000
Farm [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 101,000 148,000
2022 111,000 85,000
2021 73,000 32,000
2020 29,000 11,000
2019 8,000 8,000
Prior 23,000 22,000
Total Past Due 345,000 306,000
Farm [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 101,000 147,000
2022 111,000 85,000
2021 73,000 32,000
2020 24,000 11,000
2019 8,000 8,000
Prior 22,000 21,000
Total Past Due 339,000 304,000
Farm [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023   1,000
2020 5,000  
Prior 1,000 1,000
Total Past Due 6,000 2,000
Non - Owner Occupied CRE [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 169,000 266,000
2022 238,000 193,000
2021 175,000 102,000
2020 113,000 62,000
2019 54,000 22,000
Prior 79,000 87,000
Total Past Due 828,000 732,000
Non - Owner Occupied CRE [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 167,000 258,000
2022 232,000 191,000
2021 172,000 100,000
2020 106,000 49,000
2019 41,000 21,000
Prior 73,000 75,000
Total Past Due 791,000 694,000
Non - Owner Occupied CRE [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2022 5,000 1,000
2021 1,000 1,000
2020   11,000
Prior 2,000 7,000
Total Past Due 8,000 20,000
Non - Owner Occupied CRE [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 2,000 8,000
2022 1,000 1,000
2021 2,000 1,000
2020 7,000 2,000
2019 13,000 1,000
Prior 4,000 5,000
Total Past Due 29,000 18,000
Owner Occupied CRE [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 158,000 318,000
2022 312,000 226,000
2021 225,000 130,000
2020 114,000 84,000
2019 70,000 72,000
Prior 158,000 124,000
Total Past Due 1,037,000 954,000
Owner Occupied CRE [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 154,000 316,000
2022 305,000 224,000
2021 217,000 128,000
2020 114,000 74,000
2019 62,000 63,000
Prior 142,000 113,000
Total Past Due 994,000 918,000
Owner Occupied CRE [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 1,000 1,000
2022 1,000  
2021 4,000 1,000
2020   8,000
2019 1,000  
Prior 1,000 1,000
Total Past Due 8,000 11,000
Owner Occupied CRE [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 3,000 1,000
2022 6,000 2,000
2021 4,000 1,000
2020 0 2,000
2019 7,000 9,000
Prior 15,000 10,000
Total Past Due 35,000 25,000
Owner Occupied CRE [Member] | Doubtful [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Past Due 0  
Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 482,000 520,000
2022 421,000 361,000
2021 318,000 177,000
2020 163,000 84,000
2019 70,000 65,000
Prior 239,000 226,000
Revolving Loans Amort Cost Basis 142,000 143,000
Total Past Due 1,835,000 1,576,000
Residential [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 477,000 513,000
2022 415,000 355,000
2021 313,000 173,000
2020 158,000 82,000
2019 67,000 64,000
Prior 229,000 214,000
Revolving Loans Amort Cost Basis 138,000 139,000
Total Past Due 1,797,000 1,540,000
Residential [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 1,000 1,000
2022 2,000 3,000
2021 2,000 2,000
2020 2,000  
Prior 3,000 3,000
Revolving Loans Amort Cost Basis 1,000 1,000
Total Past Due 11,000 10,000
Residential [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 4,000 6,000
2022 4,000 3,000
2021 3,000 2,000
2020 3,000 2,000
2019 3,000 1,000
Prior 7,000 9,000
Revolving Loans Amort Cost Basis 3,000 3,000
Total Past Due 27,000 26,000
Auto [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 195,000 331,000
2022 213,000 131,000
2021 75,000 56,000
2020 27,000 25,000
2019 10,000 6,000
Prior 2,000 2,000
Total Past Due 522,000 551,000
Auto [Member] | Charge off [Member]    
Financing Receivable Recorded Investment [Line Items]    
2022 1,000  
Total Past Due 1,000  
Auto [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 195,000 331,000
2022 212,000 131,000
2021 74,000 55,000
2020 26,000 25,000
2019 10,000 6,000
Prior 2,000 2,000
Total Past Due 519,000 550,000
Auto [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2022 1,000  
2021 1,000 1,000
Total Past Due 3,000 1,000
Non - Auto [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 72 85,000
2022 47,000 42,000
2021 22,000 9,000
2020 4,000 3,000
2019 1,000 1,000
Prior 1,000 1,000
Revolving Loans Amort Cost Basis 7,000 7,000
Total Past Due 154,000 148,000
Non - Auto [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 71 85,000
2022 47,000 41,000
2021 22,000 9,000
2020 4,000 3,000
2019 1,000 1,000
Prior 1,000 1,000
Revolving Loans Amort Cost Basis 7,000 7,000
Total Past Due 153,000 147,000
Non - Auto [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
2023 1  
2022   1,000
Total Past Due $ 1 $ 1,000