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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Apr. 01, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 1,398,253 | $ 1,398,253 | $ 1,398,253 |
Happy Bancshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and due from banks | $ 112,999 |  |  |  | $ 112,553
Measurement Period Adjustments, Cash and due from banks | (446) |  |  |  |
Interest-bearing deposits with other banks | 746,031 |  |  |  | 746,031
Measurement Period Adjustments, Interest-bearing deposits with other banks | 0 |  |  |  |
Cash and cash equivalents | 859,030 |  |  |  | 858,584
Measurement Period Adjustments, Cash and cash equivalents | (446) |  |  |  |
Investment securities - available-for-sale, net of allowance for credit losses | 1,773,540 |  |  |  | 1,782,025
Measurement Period Adjustments, Investment securities - available-for-sale, net of allowance for credit losses | 8,485 |  |  |  |
Total investment securities | 1,773,540 |  |  |  | 1,782,025
Measurement Period Adjustments, Total investment securities | 8,485 |  |  |  |
Loans receivable | 3,657,009 |  |  |  | 3,652,620
Measurement Period Adjustments, Loans receivable | (4,389) |  |  |  |
Allowance for credit losses | (42,224) |  |  | $ (16,800) | (16,816)
Measurement Period Adjustments, Allowance for credit losses | 25,408 |  |  |  |
Loans receivable, net | 3,614,785 |  |  |  | 3,635,804
Measurement Period Adjustments, Loans receivable, net | 21,019 |  |  |  |
Bank premises and equipment, net | 153,642 |  |  |  | 141,372
Measurement Period Adjustments, Bank premises and equipment, net | 12,270 |  |  |  |
Foreclosed assets held for sale | 193 |  |  |  | 116
Measurement Period Adjustments, Foreclosed assets held for sale | (77) |  |  |  |
Cash value of life insurance | 105,049 |  |  |  | 105,052
Measurement Period Adjustments, Cash value of life insurance | 3 |  |  |  |
Accrued interest receivable | 31,575 |  |  |  | 31,575
Measurement Period Adjustments, Accrued interest receivable | 0 |  |  |  |
Deferred tax asset, net | 32,908 |  |  |  | 31,816
Measurement Period Adjustments, Deferred tax asset, net | (1,092) |  |  |  |
Goodwill | 130,428 |  |  |  | 0
Measurement Period Adjustments, Goodwill | (130,428) |  |  |  |
Core deposit and other intangibles | 10,672 |  |  |  | 42,263
Measurement Period Adjustments, Core deposit and other intangibles | 31,591 |  |  |  |
Other assets | 43,330 |  |  |  | 58,897
Measurement Period Adjustments, Other assets | 15,567 |  |  |  |
Total assets acquired | 6,755,152 |  |  |  | 6,687,504
Measurement Period Adjustments, Total assets acquired | (67,648) |  |  |  |
Demand and non-interest-bearing | 1,932,756 |  |  |  | 1,932,823
Measurement Period Adjustments, Demand and non-interest-bearing | 67 |  |  |  |
Savings and interest-bearing transaction accounts | 3,519,652 |  |  |  | 3,519,652
Measurement Period Adjustments, Savings and interest-bearing transaction accounts | 0 |  |  |  |
Time deposits | 401,899 |  |  |  | 402,802
Adjustment to market value - time deposits | 903 |  |  |  |
Total deposits | 5,854,307 |  |  |  | 5,855,277
Measurement Period Adjustments, Total deposits | 970 |  |  |  |
FHLB and other borrowed funds | 74,212 |  |  |  | 78,330
Measurement Period Adjustments, FHLB and other borrowed funds | 4,118 |  |  |  |
Accrued interest payable and other liabilities | 50,889 |  |  |  | 48,997
Measurement Period Adjustments, Accrued interest payable and other liabilities | (1,892) |  |  |  |
Subordinated debentures | 159,965 |  |  |  | 167,590
Measurement Period Adjustments, Subordinated Debt | 7,625 |  |  |  |
Total liabilities assumed | 6,139,373 |  |  |  | 6,150,194
Measurement Period Adjustments, Total liabilities assumed | 10,821 |  |  |  |
Total equity assumed | 615,779 |  |  |  | 0
Measurement Period Adjustments, Total equity assumed | (615,779) |  |  |  |
Total liabilities and equity assumed | 6,755,152 |  |  |  | 6,150,194
Measurement Period Adjustments, Total liabilities and equity assumed | (604,958) |  |  |  |
Net assets acquired |  |  |  |  | $ 537,310
Purchase price | 962,538 |  |  |  |
Goodwill | $ 425,228 |  |  |  |

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