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Other Borrowed Funds Other Borrowed Funds (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Schedule of Other Borrowed Funds [Table Text Block] | Information relating to other borrowings is summarized as follows (dollars in thousands):
|  | As of |  | Year Ended
|  | December 31, 2023 |  | December 31, 2023
|  | Balance |  | Rate |  | Average Balance |  | Rate |  | Maximum Outstanding At Any Month End
Funds purchased |  | $ | 515,747 |  |  | 5.17 | % |  | $ | 847,676 |  |  | 4.83 | % |  | $ | 1,711,580 |
Repurchase agreements |  | 607,001 |  |  | 1.70 | % |  | 1,805,978 |  |  | 4.32 | % |  | 4,433,480 |
Other borrowings: |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  | 7,675,000 |  |  | 5.51 | % |  | 5,948,863 |  |  | 5.28 | % |  | 7,875,000 |
GNMA repurchase liability |  | 11,660 |  |  | 4.13 | % |  | 11,224 |  |  | 4.04 | % |  | 12,414 |
Other |  | 14,892 |  |  | 5.50 | % |  | 19,008 |  |  | 3.91 | % |  | 26,311 |
Total other borrowings |  | 7,701,552 |  |  |  |  | 5,979,095 |  |  | 5.28 | % |  |
Subordinated debentures 1 |  | 131,150 |  |  | 6.93 | % |  | 131,155 |  |  | 6.83 | % |  | 131,164 |
Total other borrowed funds |  | $ | 8,955,450 |  |  |  |  | $ | 8,763,904 |  |  | 5.06 | % |  |
|  | As of |  | Year Ended
|  | December 31, 2022 |  | December 31, 2022
|  | Balance |  | Rate |  | Average Balance |  | Rate |  | Maximum Outstanding At Any Month End
Funds purchased |  | $ | 99,843 |  |  | 0.05 | % |  | $ | 266,344 |  |  | 1.12 | % |  | $ | 444,069 |
Repurchase agreements |  | 2,170,534 |  |  | 4.42 | % |  | 998,701 |  |  | 1.02 | % |  | 3,034,312 |
Other borrowings: |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  | 4,700,000 |  |  | 4.48 | % |  | 1,593,699 |  |  | 2.37 | % |  | 4,700,000 |
GNMA repurchase liability |  | 10,608 |  |  | 4.06 | % |  | 6,692 |  |  | 4.38 | % |  | 11,011 |
Other |  | 26,300 |  |  | 3.20 | % |  | 28,581 |  |  | 3.12 | % |  | 30,382 |
Total other borrowings |  | 4,736,908 |  |  |  |  | 1,628,972 |  |  | 2.41 | % |  |
Subordinated debentures 1 |  | 131,205 |  |  | 6.34 | % |  | 131,206 |  |  | 4.95 | % |  | 131,230 |
Total other borrowed funds |  | $ | 7,138,490 |  |  |  |  | $ | 3,025,223 |  |  | 1.95 | % |  |
|  | As of |  | Year Ended
|  | December 31, 2021 |  | December 31, 2021
|  | Balance |  | Rate |  | Average Balance |  | Rate |  | Maximum Outstanding At Any Month End
Funds purchased |  | $ | 199,513 |  |  | 0.05 | % |  | $ | 543,183 |  |  | 0.46 | % |  | $ | 542,465 |
Repurchase agreements |  | 2,126,936 |  |  | 0.08 | % |  | 1,695,519 |  |  | 0.33 | % |  | 2,920,728 |
Other borrowings: |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  | — |  |  | — | % |  | 1,679,315 |  |  | 0.27 | % |  | 2,600,000 |
GNMA repurchase liability |  | 7,420 |  |  | 4.36 | % |  | 11,956 |  |  | 4.06 | % |  | 23,856 |
Paycheck protection program liquidity facility |  | — |  |  | — | % |  | 879,145 |  |  | 0.35 | % |  | 1,662,598 |
Other |  | 29,333 |  |  | 3.23 | % |  | 29,445 |  |  | 4.18 | % |  | 31,875 |
Total other borrowings |  | 36,753 |  |  |  |  | 2,599,861 |  |  | 0.38 | % |  |
Subordinated debentures 1 |  | 131,226 |  |  | 3.95 | % |  | 224,058 |  |  | 4.70 | % |  | 276,049 |
Total other borrowed funds |  | $ | 2,494,428 |  |  |  |  | $ | 5,062,621 |  |  | 0.56 | % |  |
Schedule of Maturities of Other Borrowed Funds [Table Text Block] | Aggregate annual principal repayments at December 31, 2023 are as follows (in thousands):
2024 |  |  |  | $ | 8,637,633 |
2025 |  |  |  | 178,225 |
2026 |  |  |  | 3,225 |
2027 |  |  |  | 1,775 |
2028 |  |  |  | — |
Thereafter |  |  |  | 134,592 |
Total |  |  |  | $ | 8,955,450 |

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