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Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial Assets    
Cash and due from banks $ 1,251,358 $ 905,447
Equity securities 13,466 13,047
Available-for-sale debt securities 3,013,462 1,978,136
Held-to-maturity debt securities 1,004,823 731,212
Loans held for sale 25,277 168,378
Accrued interest receivable 60,844 66,790
Financial Liabilities    
Deposits 13,565,863 12,429,373
Federal Home Loan Bank borrowings 183,920 549,003
Other borrowings 141,893 241,950
Junior subordinated debt 132,860  
Subordinated debt and junior subordinated debt 132,860 192,291
Accrued interest payable 1,901 4,314
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial Assets    
Cash and due from banks 1,251,358 905,447
Equity securities 13,466 13,047
Accrued interest receivable 60,844 66,790
Financial Liabilities    
Deposits 12,273,211 10,810,863
Other borrowings 134,288 235,796
Accrued interest payable 1,901 4,314
Significant Other Observable Inputs (Level 2) [Member]    
Financial Assets    
Available-for-sale debt securities 3,011,969 1,976,601
Held-to-maturity debt securities 1,028,047 767,720
Loans held for sale 25,277 168,378
Other assets—interest rate derivatives 24,867 46,418
Financial Liabilities    
Deposits 1,302,266 1,629,118
Federal Home Loan Bank borrowings 185,684 555,375
Junior subordinated debt 109,186  
Subordinated debt and junior subordinated debt   105,768
Other liabilities—interest rate derivatives 26,388 49,917
Significant Unobservable Inputs (Level 3) [Member]    
Financial Assets    
Available-for-sale debt securities 1,493 1,535
Held-to-maturity debt securities 405 463
Net loans 9,385,917 10,802,883
Financial Liabilities    
Subordinated debt and junior subordinated debt   68,684
Carrying Amount [Member]    
Financial Assets    
Cash and due from banks 1,251,358 905,447
Equity securities 13,466 13,047
Available-for-sale debt securities 3,013,462 1,978,136
Held-to-maturity debt securities 1,004,555 730,886
Net loans 9,611,856 10,603,406
Loans held for sale 25,277 168,378
Other assets—interest rate derivatives 24,867 46,418
Accrued interest receivable 60,844 66,790
Financial Liabilities    
Deposits 13,565,863 12,429,373
Federal Home Loan Bank borrowings 183,920 549,003
Other borrowings 141,893 241,950
Junior subordinated debt 132,860  
Subordinated debt and junior subordinated debt   192,291
Other liabilities—interest rate derivatives 26,388 49,917
Accrued interest payable 1,901 4,314
Fair Value Estimate [Member]    
Financial Assets    
Cash and due from banks 1,251,358 905,447
Equity securities 13,466 13,047
Available-for-sale debt securities 3,013,462 1,978,136
Held-to-maturity debt securities 1,028,452 768,183
Net loans 9,385,917 10,802,883
Loans held for sale 25,277 168,378
Other assets—interest rate derivatives 24,867 46,418
Accrued interest receivable 60,844 66,790
Financial Liabilities    
Deposits 13,575,477 12,439,981
Federal Home Loan Bank borrowings 185,684 555,375
Other borrowings 134,288 235,796
Junior subordinated debt 109,186  
Subordinated debt and junior subordinated debt   174,452
Other liabilities—interest rate derivatives 26,388 49,917
Accrued interest payable $ 1,901 $ 4,314