Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) $ in Thousands	Feb. 08, 2022 USD ($) Location	Jun. 17, 2021 USD ($)	May 20, 2021 USD ($) Location	Jan. 22, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Combination Separately Recognized Transactions [Line Items]
Total assets					$ 12,387,863	$ 9,405,612	$ 9,212,357
Loans held for investment (net of unearned interest)					6,943,563	6,169,442
Deposits					10,974,228	8,091,914
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]			Noninterest Income, Other
Goodwill					$ 182,055	$ 149,922
Oklahoma [Member]
Business Combination Separately Recognized Transactions [Line Items]
Sale of Loans				$ 21,000
Deposits sold				38,000
Oklahoma [Member] | Noninterest Income [Member]
Business Combination Separately Recognized Transactions [Line Items]
Gain on transaction				$ 2,500
First National Bank and Trust [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total assets			$ 284,000
Loans held for investment (net of unearned interest)			195,000
Deposits			256,000
Purchase price			21,000
Bargain purchase gain			4,800
Purchase expenses			4,800
Intangibles assets, net			$ 1,700
First National Bank and Trust [Member] | Oklahoma [Member]
Business Combination Separately Recognized Transactions [Line Items]
Number of banking locations | Location			2
Subordinated Notes due 2036 [Member] | Private Placement [Member]
Business Combination Separately Recognized Transactions [Line Items]
Aggregate principal amount		$ 60,000
Fixed-to-floating rate		3.50%
Debt instrument maturity year		2036
Worthington [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total assets	$ 478,000
Loans held for investment (net of unearned interest)	257,000
Deposits	430,000
Purchase price	77,700
Intangibles assets, net	5,900
Goodwill	$ 32,100
Worthington [Member] | Arlington, Texas [Member]
Business Combination Separately Recognized Transactions [Line Items]
Number of banking locations | Location	1
Worthington [Member] | Colleyville, Texas [Member]
Business Combination Separately Recognized Transactions [Line Items]
Number of banking locations | Location	1
Worthington [Member] | Fort Worth, Texas [Member]
Business Combination Separately Recognized Transactions [Line Items]
Number of banking locations | Location	2