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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities, net | $ 3,094,858 | $ 3,063,233
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 745,912 | 682,122
Interest bearing balances due from banks - time | 545 | 795
Held-to-maturity securities, net | 3,756,754 | 3,759,706
Interest receivable | 103,431 | 102,892
Federal funds purchased and securities sold under agreements to repurchase | 102,586 | 160,403
Other borrowings | 1,373,339 | 859,296
Subordinated notes and debentures | 366,065 | 365,989
Interest payable | 27,346 | 16,399
Carrying Amount | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 16,623,687 | 15,945,169
Carrying Amount | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,264,962 | 6,016,651
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,866,078 | 11,762,885
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 6,357,682 | 4,768,558
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 745,912 | 682,122
Interest bearing balances due from banks - time | 545 | 795
Held-to-maturity securities, net | 3,094,858 | 3,063,233
Interest receivable | 103,431 | 102,892
Federal funds purchased and securities sold under agreements to repurchase | 102,586 | 160,403
Other borrowings | 1,370,261 | 857,257
Subordinated notes and debentures | 359,801 | 363,578
Interest payable | 27,346 | 16,399
Fair Value Measurements | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 15,928,195 | 15,573,555
Fair Value Measurements | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,264,962 | 6,016,651
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,866,078 | 11,762,885
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 6,293,911 | 4,696,473
Fair Value Measurements | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 745,912 | 682,122
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 | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 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 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 0 | 0
Interest bearing balances due from banks - time | 545 | 795
Held-to-maturity securities, net | 3,094,858 | 3,063,233
Interest receivable | 103,431 | 102,892
Federal funds purchased and securities sold under agreements to repurchase | 102,586 | 160,403
Other borrowings | 1,370,261 | 857,257
Subordinated notes and debentures | 359,801 | 363,578
Interest payable | 27,346 | 16,399
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 2 | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,264,962 | 6,016,651
Fair Value Measurements | Level 2 | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 10,866,078 | 11,762,885
Fair Value Measurements | Level 2 | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 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 | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 15,928,195 | 15,573,555
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 | $ 6,293,911 | $ 4,696,473

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