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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities | $ 1,487,916 | $ 341,925
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,781,413 | 3,472,152
Interest bearing balances due from banks - time | 1,780 | 1,579
Held-to-maturity securities | 1,516,797 | 333,031
Interest receivable | 68,405 | 72,597
Loans, net | 10,622,719 | 12,662,847
Federal funds purchased and securities sold under agreements to repurchase | 217,276 | 299,111
Other borrowings | 1,338,585 | 1,342,067
Subordinated notes and debentures | 383,278 | 382,874
Interest payable | 11,230 | 8,887
Carrying Amount | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,918,845 | 4,482,091
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,697,451 | 9,672,608
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 2,455,774 | 2,832,327
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,781,413 | 3,472,152
Interest bearing balances due from banks - time | 1,780 | 1,579
Held-to-maturity securities | 1,487,916 | 341,925
Interest receivable | 68,405 | 72,597
Loans, net | 10,705,185 | 12,736,991
Federal funds purchased and securities sold under agreements to repurchase | 217,276 | 299,111
Other borrowings | 1,408,087 | 1,448,625
Subordinated notes and debentures | 395,786 | 398,827
Interest payable | 11,230 | 8,887
Fair Value Measurements | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,918,845 | 4,482,091
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,697,451 | 9,672,608
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 2,460,441 | 2,848,621
Fair Value Measurements | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,781,413 | 3,472,152
Interest bearing balances due from banks - time | 0 | 0
Held-to-maturity securities | 0 | 0
Interest receivable | 0 | 0
Loans, net | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase | 0 | 0
Other borrowings | 0 | 0
Subordinated notes and debentures | 0 | 0
Interest payable | 0 | 0
Fair Value Measurements | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | Quoted Prices in Active Markets for Identical Assets (Level 1) | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 0 | 0
Interest bearing balances due from banks - time | 1,780 | 1,579
Held-to-maturity securities | 1,487,916 | 341,925
Interest receivable | 68,405 | 72,597
Loans, net | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase | 217,276 | 299,111
Other borrowings | 1,408,087 | 1,448,625
Subordinated notes and debentures | 395,786 | 398,827
Interest payable | 11,230 | 8,887
Fair Value Measurements | Significant Other Observable Inputs (Level 2) | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,918,845 | 4,482,091
Fair Value Measurements | Significant Other Observable Inputs (Level 2) | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,697,451 | 9,672,608
Fair Value Measurements | Significant Other Observable Inputs (Level 2) | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 0 | 0
Interest bearing balances due from banks - time | 0 | 0
Held-to-maturity securities | 0 | 0
Interest receivable | 0 | 0
Loans, net | 10,705,185 | 12,736,991
Federal funds purchased and securities sold under agreements to repurchase | 0 | 0
Other borrowings | 0 | 0
Subordinated notes and debentures | 0 | 0
Interest payable | 0 | 0
Fair Value Measurements | Significant Unobservable Inputs (Level 3) | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | Significant Unobservable Inputs (Level 3) | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | Significant Unobservable Inputs (Level 3) | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | $ 2,460,441 | $ 2,848,621

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