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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities | $ 49,064 | $ 41,855
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 2,522,131 | 996,623
Interest bearing balances due from banks - time | 4,061 | 4,554
Held-to-maturity securities | 47,102 | 40,927
Mortgage loans held for sale | 192,729 | 58,102
Interest receivable | 77,352 | 62,707
Loans, net | 13,769,191 | 14,357,460
Federal funds purchased and securities sold under agreements to repurchase | 313,694 | 150,145
Other borrowings | 1,342,769 | 1,297,599
Subordinated notes and debentures | 382,739 | 388,260
Interest payable | 13,694 | 12,898
Carrying Amount | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,451,385 | 3,741,093
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 8,993,255 | 9,090,878
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 2,802,007 | 3,276,969
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 2,522,131 | 996,623
Interest bearing balances due from banks - time | 4,061 | 4,554
Held-to-maturity securities | 49,064 | 41,855
Mortgage loans held for sale | 192,729 | 58,102
Interest receivable | 77,352 | 62,707
Loans, net | 13,864,914 | 14,290,188
Federal funds purchased and securities sold under agreements to repurchase | 313,694 | 150,145
Other borrowings | 1,459,468 | 1,298,011
Subordinated notes and debentures | 400,421 | 397,088
Interest payable | 13,694 | 12,898
Fair Value Measurements | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,451,385 | 3,741,093
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 8,993,255 | 9,090,878
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 2,820,224 | 3,270,333
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 | 2,522,131 | 996,623
Interest bearing balances due from banks - time | 0 | 0
Held-to-maturity securities | 0 | 0
Mortgage loans held for sale | 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 | 4,061 | 4,554
Held-to-maturity securities | 49,064 | 41,855
Mortgage loans held for sale | 0 | 0
Interest receivable | 77,352 | 62,707
Loans, net | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase | 313,694 | 150,145
Other borrowings | 1,459,468 | 1,298,011
Subordinated notes and debentures | 400,421 | 397,088
Interest payable | 13,694 | 12,898
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 | 4,451,385 | 3,741,093
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 | 8,993,255 | 9,090,878
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
Mortgage loans held for sale | 192,729 | 58,102
Interest receivable | 0 | 0
Loans, net | 13,864,914 | 14,290,188
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 | $ 2,820,224 | $ 3,270,333

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