Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financial Assets
Cash and due from banks	$ 595,383	$ 408,411
Equity securities	12,320	11,506
Available-for-sale debt securities	2,194,329	2,529,140
Net held-to-maturity debt securities	1,199,527	1,248,629
Loans held for sale	16,354	8,249
Accrued interest receivable	77,435	68,522
Financial Liabilities
Deposits	13,168,704	13,131,090
Federal Home Loan Bank borrowings	1,350,000	705,000
Other borrowings	105,893	135,069
Subordinated debt and junior subordinated debt	279,078	281,404
Accrued interest payable	11,121	4,593
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets
Cash and due from banks	595,383	408,411
Equity securities	12,320	11,506
Accrued interest receivable	77,435	68,522
Financial Liabilities
Deposits	11,937,002	12,245,272
Other borrowings	103,057	122,926
Accrued interest payable	11,121	4,593
Significant Other Observable Inputs (Level 2) [Member]
Financial Assets
Available-for-sale debt securities	2,193,162	2,527,961
Net held-to-maturity debt securities	1,068,896	1,084,071
Loans held for sale	16,354	8,249
Other assets—interest rate derivatives	72,183	75,840
Financial Liabilities
Deposits	1,209,819	897,671
Federal Home Loan Bank borrowings	1,349,217	705,094
Subordinated debt and junior subordinated debt	240,898	258,631
Other liabilities—interest rate derivatives	73,083	74,683
Significant Unobservable Inputs (Level 3) [Member]
Financial Assets
Available-for-sale debt securities	1,167	1,179
Net held-to-maturity debt securities	263	319
Net loans	11,134,250	9,487,038
Carrying Amount [Member]
Financial Assets
Cash and due from banks	595,383	408,411
Equity securities	12,320	11,506
Available-for-sale debt securities	2,194,329	2,529,140
Net held-to-maturity debt securities	1,199,335	1,248,409
Net loans	11,507,786	10,584,938
Loans held for sale	16,354	8,249
Other assets—interest rate derivatives	72,183	75,840
Accrued interest receivable	77,435	68,522
Financial Liabilities
Deposits	13,168,704	13,131,090
Federal Home Loan Bank borrowings	1,350,000	705,000
Other borrowings	105,893	135,069
Subordinated debt and junior subordinated debt	279,078	281,404
Other liabilities—interest rate derivatives	73,083	74,683
Accrued interest payable	11,121	4,593
Fair Value Estimate [Member]
Financial Assets
Cash and due from banks	595,383	408,411
Equity securities	12,320	11,506
Available-for-sale debt securities	2,194,329	2,529,140
Net held-to-maturity debt securities	1,069,159	1,084,390
Net loans	11,134,250	9,487,038
Loans held for sale	16,354	8,249
Other assets—interest rate derivatives	72,183	75,840
Accrued interest receivable	77,435	68,522
Financial Liabilities
Deposits	13,146,821	13,142,943
Federal Home Loan Bank borrowings	1,349,217	705,094
Other borrowings	103,057	122,926
Subordinated debt and junior subordinated debt	240,898	258,631
Other liabilities—interest rate derivatives	73,083	74,683
Accrued interest payable	$ 11,121	$ 4,593