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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities, net | $ 3,109,610 | $ 3,135,370
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 603,402 | 614,092
Interest bearing balances due from banks - time | 100 | 100
Held-to-maturity securities, net | 3,658,700 | 3,726,288
Interest receivable | 125,700 | 122,430
Federal funds purchased and securities sold under agreements to repurchase | 51,071 | 67,969
Other borrowings | 1,045,878 | 972,366
Subordinated notes and debentures | 366,255 | 366,141
Interest payable | 63,210 | 35,618
Carrying Amount | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,521,715 | 4,800,880
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,863,945 | 10,997,425
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 6,549,774 | 6,446,673
Carrying Amount | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 17,102,817 | 16,620,439
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 603,402 | 614,092
Interest bearing balances due from banks - time | 100 | 100
Held-to-maturity securities, net | 3,109,610 | 3,135,370
Interest receivable | 125,700 | 122,430
Federal funds purchased and securities sold under agreements to repurchase | 51,071 | 67,969
Other borrowings | 1,045,075 | 970,846
Subordinated notes and debentures | 361,885 | 349,424
Interest payable | 63,210 | 35,618
Fair Value Measurements | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,521,715 | 4,800,880
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,863,945 | 10,997,425
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 6,542,007 | 6,414,222
Fair Value Measurements | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 16,174,963 | 15,734,766
Fair Value Measurements | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 603,402 | 614,092
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 | Level 1 | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | 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 | Level 1 | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | Level 1 | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 0 | 0
Fair Value Measurements | 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 | 100 | 100
Held-to-maturity securities, net | 3,109,610 | 3,135,370
Interest receivable | 125,700 | 122,430
Federal funds purchased and securities sold under agreements to repurchase | 51,071 | 67,969
Other borrowings | 1,045,075 | 970,846
Subordinated notes and debentures | 361,885 | 349,424
Interest payable | 63,210 | 35,618
Fair Value Measurements | Level 2 | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,521,715 | 4,800,880
Fair Value Measurements | Level 2 | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,863,945 | 10,997,425
Fair Value Measurements | Level 2 | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | Level 2 | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 0 | 0
Fair Value Measurements | 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 | Level 3 | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 0 | 0
Fair Value Measurements | 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 | Level 3 | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 6,542,007 | 6,414,222
Fair Value Measurements | Level 3 | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | $ 16,174,963 | $ 15,734,766

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