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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities, net | $ 1,307,058 | $ 1,517,378
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,687,017 | 1,650,653
Interest bearing balances due from banks - time | 1,857 | 1,882
Held-to-maturity securities, net | 1,556,825 | 1,529,221
Interest receivable | 69,357 | 72,990
Loans, net | 11,849,669 | 11,807,171
Federal funds purchased and securities sold under agreements to repurchase | 196,828 | 185,403
Other borrowings | 1,337,243 | 1,337,973
Subordinated notes and debentures | 384,242 | 384,131
Interest payable | 9,979 | 6,759
Carrying Amount | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,223,862 | 5,325,318
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 12,105,948 | 11,588,770
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 2,062,612 | 2,452,460
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,687,017 | 1,650,653
Interest bearing balances due from banks - time | 1,857 | 1,882
Held-to-maturity securities, net | 1,307,058 | 1,517,378
Interest receivable | 69,357 | 72,990
Loans, net | 11,897,022 | 11,922,735
Federal funds purchased and securities sold under agreements to repurchase | 196,828 | 185,403
Other borrowings | 1,353,902 | 1,393,711
Subordinated notes and debentures | 387,031 | 394,464
Interest payable | 9,979 | 6,759
Fair Value Measurements | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,223,862 | 5,325,318
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 12,105,948 | 11,588,770
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 2,041,775 | 2,451,055
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 | 1,687,017 | 1,650,653
Interest bearing balances due from banks - time | 0 | 0
Held-to-maturity securities, net | 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 | 1,857 | 1,882
Held-to-maturity securities, net | 1,307,058 | 1,517,378
Interest receivable | 69,357 | 72,990
Loans, net | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase | 196,828 | 185,403
Other borrowings | 1,353,902 | 1,393,711
Subordinated notes and debentures | 387,031 | 394,464
Interest payable | 9,979 | 6,759
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 | 5,223,862 | 5,325,318
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 | 12,105,948 | 11,588,770
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, net | 0 | 0
Interest receivable | 0 | 0
Loans, net | 11,897,022 | 11,922,735
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 | $ 2,041,775 | $ 2,451,055

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