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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities, net | $ 2,929,625 | $ 2,949,951
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 634,286 | 687,377
Interest bearing balances due from banks - time | 100 | 100
Held-to-maturity securities, net | 3,615,556 | 3,636,636
Interest receivable | 117,398 | 123,243
Federal funds purchased and securities sold under agreements to repurchase | 50,133 | 37,109
Other borrowings | 884,863 | 745,372
Subordinated notes and debentures | 366,331 | 366,293
Interest payable | 52,636 | 67,111
Carrying Amount | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,455,255 | 4,460,517
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 11,265,554 | 10,982,022
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,963,811 | 6,443,211
Carrying Amount | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 16,841,910 | 16,770,918
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 634,286 | 687,377
Interest bearing balances due from banks - time | 100 | 100
Held-to-maturity securities, net | 2,929,625 | 2,949,951
Interest receivable | 117,398 | 123,243
Federal funds purchased and securities sold under agreements to repurchase | 50,133 | 37,109
Other borrowings | 883,754 | 743,940
Subordinated notes and debentures | 365,081 | 361,332
Interest payable | 52,636 | 67,111
Fair Value Measurements | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,455,255 | 4,460,517
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 11,265,554 | 10,982,022
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 5,949,775 | 6,429,309
Fair Value Measurements | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 16,266,425 | 16,153,128
Fair Value Measurements | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 634,286 | 687,377
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 | 2,929,625 | 2,949,951
Interest receivable | 117,398 | 123,243
Federal funds purchased and securities sold under agreements to repurchase | 50,133 | 37,109
Other borrowings | 883,754 | 743,940
Subordinated notes and debentures | 365,081 | 361,332
Interest payable | 52,636 | 67,111
Fair Value Measurements | Level 2 | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,455,255 | 4,460,517
Fair Value Measurements | Level 2 | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 11,265,554 | 10,982,022
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 | 5,949,775 | 6,429,309
Fair Value Measurements | Level 3 | Legacy Loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | $ 16,266,425 | $ 16,153,128

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