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Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Held-to-maturity securities, net | $ 3,063,233 | $ 1,517,378
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 682,122 | 1,650,653
Interest bearing balances due from banks - time | 795 | 1,882
Held-to-maturity securities, net | 3,759,706 | 1,529,221
Interest receivable | 102,892 | 72,990
Federal funds purchased and securities sold under agreements to repurchase | 160,403 | 185,403
Other borrowings | 859,296 | 1,337,973
Subordinated notes and debentures | 365,989 | 384,131
Interest payable | 16,399 | 6,759
Carrying Amount | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 6,016,651 | 5,325,318
Carrying Amount | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 11,762,885 | 11,588,770
Carrying Amount | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,768,558 | 2,452,460
Carrying Amount | Loans, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 15,945,169 | 11,807,171
Fair Value Measurements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 682,122 | 1,650,653
Interest bearing balances due from banks - time | 795 | 1,882
Held-to-maturity securities, net | 3,063,233 | 1,517,378
Interest receivable | 102,892 | 72,990
Federal funds purchased and securities sold under agreements to repurchase | 160,403 | 185,403
Other borrowings | 857,257 | 1,393,711
Subordinated notes and debentures | 363,578 | 394,464
Interest payable | 16,399 | 6,759
Fair Value Measurements | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 6,016,651 | 5,325,318
Fair Value Measurements | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 11,762,885 | 11,588,770
Fair Value Measurements | Time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 4,696,473 | 2,451,055
Fair Value Measurements | Loans, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | 15,573,555 | 11,922,735
Fair Value Measurements | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 682,122 | 1,650,653
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 | Loans, net |  |
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 | 795 | 1,882
Held-to-maturity securities, net | 3,063,233 | 1,517,378
Interest receivable | 102,892 | 72,990
Federal funds purchased and securities sold under agreements to repurchase | 160,403 | 185,403
Other borrowings | 857,257 | 1,393,711
Subordinated notes and debentures | 363,578 | 394,464
Interest payable | 16,399 | 6,759
Fair Value Measurements | Level 2 | Noninterest bearing transaction accounts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 6,016,651 | 5,325,318
Fair Value Measurements | Level 2 | Interest bearing transaction accounts and savings deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deposits | 11,762,885 | 11,588,770
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 | Loans, net |  |
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 | 4,696,473 | 2,451,055
Fair Value Measurements | Level 3 | Loans, net |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans, net | $ 15,573,555 | $ 11,922,735

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