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Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Mortgage servicing rights | $ 81,036 | $ 78,390 | $ 74,097 | $ 73,850 | $ 66,047 | $ 47,392
Fair Value, Recurring |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Available-for-sale securities | 495,992 |  | 536,973 |  |  |
Loans held-for-sale | 51,465 |  | 57,323 |  |  |
Mortgage servicing rights | 81,036 |  | 74,097 |  |  |
Derivative financial instruments - assets | 50,815 |  | 40,287 |  |  |
Derivative financial instruments - liabilities | (31,593) |  | (24,527) |  |  |
Total | 647,715 |  | 684,153 |  |  |
Fair Value, Recurring | Level 1 |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Available-for-sale securities | 52,853 |  | 56,649 |  |  |
Loans held-for-sale | 0 |  | 0 |  |  |
Mortgage servicing rights | 0 |  | 0 |  |  |
Derivative financial instruments - assets | 0 |  | 0 |  |  |
Derivative financial instruments - liabilities | 0 |  | 0 |  |  |
Total | 52,853 |  | 56,649 |  |  |
Fair Value, Recurring | Level 2 |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Available-for-sale securities | 443,139 |  | 480,324 |  |  |
Loans held-for-sale | 51,465 |  | 57,323 |  |  |
Mortgage servicing rights | 0 |  | 0 |  |  |
Derivative financial instruments - assets | 50,815 |  | 40,287 |  |  |
Derivative financial instruments - liabilities | (31,593) |  | (24,527) |  |  |
Total | 513,826 |  | 553,407 |  |  |
Fair Value, Recurring | Level 3 |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  | 0 |  |  |
Loans held-for-sale | 0 |  | 0 |  |  |
Mortgage servicing rights | 81,036 |  | 74,097 |  |  |
Derivative financial instruments - assets | 0 |  | 0 |  |  |
Derivative financial instruments - liabilities | 0 |  | 0 |  |  |
Total | $ 81,036 |  | $ 74,097 |  |  |

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