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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities, net | $ 1,517,378 | $ 341,925
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,650,653 | 3,472,152
Interest bearing balances due from banks - time | 1,882 | 1,579
Held-to-maturity securities, net | 1,529,221 | 333,031
Interest receivable | 72,990 | 72,597
Federal funds purchased and securities sold under agreements to repurchase | 185,403 | 299,111
Other borrowings | 1,337,973 | 1,342,067
Subordinated notes and debentures | 384,131 | 382,874
Interest payable | 6,759 | 8,887
Carrying Amount | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,325,318 | 4,482,091
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 11,588,770 | 9,672,608
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 2,452,460 | 2,832,327
Carrying Amount | Loans, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 11,807,171 | 12,662,847
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,650,653 | 3,472,152
Interest bearing balances due from banks - time | 1,882 | 1,579
Held-to-maturity securities, net | 1,517,378 | 341,925
Interest receivable | 72,990 | 72,597
Federal funds purchased and securities sold under agreements to repurchase | 185,403 | 299,111
Other borrowings | 1,393,711 | 1,448,625
Subordinated notes and debentures | 394,464 | 398,827
Interest payable | 6,759 | 8,887
Fair Value Measurements | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,325,318 | 4,482,091
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 11,588,770 | 9,672,608
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 2,451,055 | 2,848,621
Fair Value Measurements | Loans, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 11,922,735 | 12,736,991
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 | 1,650,653 | 3,472,152
Interest bearing balances due from banks - time | 0 | 0
Held-to-maturity securities, net | 0 | 0
Interest receivable | 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 | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 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 | 1,882 | 1,579
Held-to-maturity securities, net | 1,517,378 | 341,925
Interest receivable | 72,990 | 72,597
Federal funds purchased and securities sold under agreements to repurchase | 185,403 | 299,111
Other borrowings | 1,393,711 | 1,448,625
Subordinated notes and debentures | 394,464 | 398,827
Interest payable | 6,759 | 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 | 5,325,318 | 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 | 11,588,770 | 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 Other Observable Inputs (Level 2) | Loans, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 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, net | 0 | 0
Interest receivable | 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 | 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 | 2,451,055 | 2,848,621
Fair Value Measurements | Significant Unobservable Inputs (Level 3) | Loans, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | $ 11,922,735 | $ 12,736,991

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