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Investment Securities - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) | Apr. 01, 2022 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Carrying value of investment securities | $ 3,570,000,000 | $ 2,350,000,000 |  |  |  |
Investment securities pledged as collateral | 142,100,000 | 131,100,000 |  |  |  |
Available for sale securities sold | 0 | 67,300,000 | $ 17,900,000 |  |  |
Realized gains (losses) on available for sale securities |  | 0 | $ 219,000 |  |  |
Income tax expense benefit to net security gains and losses, percentage |  |  | 25.74% |  |  |
Investment securities, provision for credit losses | 1,700,000 |  |  |  |  |
Investment securities, provision for credit losses | 2,525,000 | 842,000 | $ 842,000 |  |  | $ 842,000
Allowance for credit loss, held-to-maturity | 2,005,000 | 2,005,000 | $ 0 | $ 2,000,000 |  | $ 0
Fair value of unrealized losses | $ 333,485,000 | $ 264,580,000 |  |  |  |
Percentage of Company's investment portfolio | 30.40% | 33.00% |  |  |  |
Number of investment securities available for sale | security | 1,583 |  |  |  |  |
Number of investment in debt securities unrealized loss position | security | 1,296 |  |  |  |  |
Debt securities available for sale unrealized loss position | $ 336,279,000 | $ 407,967,000 |  |  |  |
Number of investment securities held to maturity | security | 507 |  |  |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 486 |  |  |  |  |
Unrealized losses | $ 112,063,000 | 161,755,000 |  |  |  |
Happy Bancshares, Inc. |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities - available-for-sale, net of allowance for credit losses |  |  |  | $ 1,782,025,000 | $ 1,773,540,000 |
Investments reclassified from available-for-sale to held-to-maturity | 1,120,000,000 |  |  |  |  |
U.S. government-sponsored enterprises |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | 0 | 0 |  |  |  |
Allowance for credit loss, held-to-maturity | 0 | 0 |  |  |  |
Fair value of unrealized losses | $ 17,091,000 | 20,153,000 |  |  |  |
Number of investment in debt securities unrealized loss position | security | 59 |  |  |  |  |
Debt securities available for sale unrealized loss position | $ 17,093,000 | 23,209,000 |  |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 5 |  |  |  |  |
Unrealized losses | $ 2,607,000 | 3,349,000 |  |  |  |
U.S. government-sponsored mortgage-backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | 0 | 0 |  |  |  |
Allowance for credit loss, held-to-maturity | 0 | 0 |  |  |  |
Fair value of unrealized losses | $ 189,391,000 | 168,900,000 |  |  |  |
Number of investment in debt securities unrealized loss position | security | 669 |  |  |  |  |
Debt securities available for sale unrealized loss position | $ 191,557,000 | 215,405,000 |  |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 18 |  |  |  |  |
Unrealized losses | $ 4,362,000 | 3,756,000 |  |  |  |
Private mortgage-backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | 0 | 0 |  |  |  |
Fair value of unrealized losses | $ 15,891,000 | 0 |  |  |  |
Number of investment in debt securities unrealized loss position | security | 32 |  |  |  |  |
Debt securities available for sale unrealized loss position | $ 16,117,000 | 18,302,000 |  |  |  |
Non-government-sponsored asset backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | 0 | 0 |  |  |  |
Fair value of unrealized losses | $ 7,551,000 | 4,928,000 |  |  |  |
Number of investment in debt securities unrealized loss position | security | 31 |  |  |  |  |
Debt securities available for sale unrealized loss position | $ 7,551,000 | 14,654,000 |  |  |  |
State and political subdivisions |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | 0 | 842,000 |  |  |  |
Allowance for credit loss, held-to-maturity | 2,005,000 | 2,005,000 |  |  |  |
Fair value of unrealized losses | $ 75,531,000 | 65,214,000 |  |  |  |
Number of investment in debt securities unrealized loss position | security | 444 |  |  |  |  |
Debt securities available for sale unrealized loss position | $ 75,931,000 | 115,698,000 |  |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 463 |  |  |  |  |
Unrealized losses | $ 105,094,000 | 154,650,000 |  |  |  |
Other securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Investment securities, provision for credit losses | 2,525,000 | 0 |  |  |  |
Fair value of unrealized losses | $ 28,030,000 | 5,385,000 |  |  |  |
Number of investment in debt securities unrealized loss position | security | 61 |  |  |  |  |
Debt securities available for sale unrealized loss position | $ 28,030,000 | $ 20,699,000 |  |  |  |

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