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Business Combinations - Acquisition of Happy Bancshares (Detail) - Happy Bancshares, Inc. $ in Thousands, shares in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 01, 2022 USD ($) location shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |
Business combination consideration paid | $ 962,538 |  |  |
Business combination, recognized identifiable assets acquired | 6,755,152 |  |  | $ 6,687,504
Loans receivable | 3,657,009 |  |  | 3,652,620
Total deposits | $ 5,854,307 |  |  | $ 5,855,277
Number of locations operated by acquiree prior to acquisition | location | 62,000 |  |  |
Adjustment to market value - investment securities | $ 8,485 |  |  |
Adjustment to market value - bank premises and equipment | (12,270) |  |  |
Measurement Period Adjustments, Time deposits | $ 903 |  |  |
Pro forma merger expenses |  | $ 49,600 | $ 49,600 |
Pro forma credit losses on acquired loans |  | 45,200 | 45,200 |
Pro forma credit losses on acquired unfunded commitments |  | 11,400 | 11,400 |
Pro forma credit losses on acquired investment securities |  | $ 2,000 | $ 2,000 |
Common Stock |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, equity interest issuable, number of shares (in shares) | shares | 42.4 |  |  |
Business acquisition, equity interest issuable, value | $ 958,800 |  |  |
Business combination consideration paid | 962,500 |  |  |
Stock-based Awards |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, equity interest issuable, value | $ 3,700 |  |  |

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