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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |
Carrying amount of Company's goodwill |  | $ 1,398,253 | $ 1,398,253 |  | $ 973,025
Goodwill |  | $ 0 | 425,228 |  |
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) |  |  |  |
Carrying amount of Company's 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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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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