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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities | $ 55,714 | $ 41,855
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,737,199 | 996,623
Interest bearing balances due from banks - time | 4,309 | 4,554
Held-to-maturity securities | 53,968 | 40,927
Mortgage loans held for sale | 49,984 | 58,102
Interest receivable | 57,039 | 62,707
Loans, net | 14,131,082 | 14,357,460
Federal funds purchased and securities sold under agreements to repurchase | 377,859 | 150,145
Other borrowings | 1,396,829 | 1,297,599
Subordinated notes and debentures | 388,396 | 388,260
Interest payable | 15,258 | 12,898
Carrying Amount | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 3,572,244 | 3,741,093
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 8,840,678 | 9,090,878
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 3,146,811 | 3,276,969
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,737,199 | 996,623
Interest bearing balances due from banks - time | 4,309 | 4,554
Held-to-maturity securities | 55,714 | 41,855
Mortgage loans held for sale | 49,984 | 58,102
Interest receivable | 57,039 | 62,707
Loans, net | 14,160,286 | 14,290,188
Federal funds purchased and securities sold under agreements to repurchase | 377,859 | 150,145
Other borrowings | 1,411,137 | 1,298,011
Subordinated notes and debentures | 407,301 | 397,088
Interest payable | 15,258 | 12,898
Fair Value Measurements | Non-interest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 3,572,244 | 3,741,093
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 8,840,678 | 9,090,878
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 3,163,694 | 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 | 1,737,199 | 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 | 4,309 | 4,554
Held-to-maturity securities | 55,714 | 41,855
Mortgage loans held for sale | 0 | 0
Interest receivable | 57,039 | 62,707
Loans, net | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase | 377,859 | 150,145
Other borrowings | 1,411,137 | 1,298,011
Subordinated notes and debentures | 407,301 | 397,088
Interest payable | 15,258 | 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 | 3,572,244 | 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 | 8,840,678 | 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 | 49,984 | 58,102
Interest receivable | 0 | 0
Loans, net | 14,160,286 | 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 | $ 3,163,694 | $ 3,270,333

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