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DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Cash and cash equivalents, Carrying Amount $ 4,185,639 $ 3,785,931
Cash and cash equivalents, Estimated Fair Value 4,185,639 3,785,931
Debt securities, available for sale 1,979,832 1,985,438
Debt securities, held to maturity 801,324 991,937
Debt securities, held to maturity, fair value 757,130 934,677
Loans held for sale 30,897 204,794
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Carrying Amount 16,120,441 14,311,987
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 15,831,500 14,104,884
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount 103,290 96,214
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 103,290 96,214
Derivatives 12,631 15,263
Liabilities:    
Deposits, Carrying Amount 20,405,023 18,846,461
Deposits, Estimated Fair Value 20,431,102 18,842,810
FHLB advances, Carrying Amount 1,195,437 1,128,352
FHLB advances, Estimated Fair Value 1,197,611 1,103,324
Other borrowings, Carrying Amount 99,173 99,068
Other borrowings, Estimated Fair Value 87,336 88,000
Subordinated debt, Carrying Amount 182,718 182,509
Subordinated debt, Estimated Fair Value 174,181 167,601
Derivative liabilities 17,430 22,570
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents, Estimated Fair Value 4,185,639 3,785,931
Debt securities, available for sale 0 0
Debt securities, held to maturity, fair value 0 0
Loans held for sale 0 0
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 0 0
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0
Derivatives 0 0
Liabilities:    
Deposits, Estimated Fair Value 17,325,220 16,138,256
FHLB advances, Estimated Fair Value 0 0
Other borrowings, Estimated Fair Value 0 0
Subordinated debt, Estimated Fair Value 0 0
Derivative liabilities 0 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents, Estimated Fair Value 0 0
Debt securities, available for sale 1,697,993 1,972,202
Debt securities, held to maturity, fair value 456,455 461,307
Loans held for sale 2,229 1,836
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 1,486,978 1,321,128
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 103,290 96,214
Derivatives 12,613 15,223
Liabilities:    
Deposits, Estimated Fair Value 3,105,882 2,704,554
FHLB advances, Estimated Fair Value 1,197,611 1,103,324
Other borrowings, Estimated Fair Value 87,336 88,000
Subordinated debt, Estimated Fair Value 174,181 167,601
Derivative liabilities 17,430 22,570
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents, Estimated Fair Value 0 0
Debt securities, available for sale 281,839 13,236
Debt securities, held to maturity, fair value 300,675 473,370
Loans held for sale 28,668 202,958
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 14,344,522 12,783,756
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0
Derivatives 18 40
Liabilities:    
Deposits, Estimated Fair Value 0 0
FHLB advances, Estimated Fair Value 0 0
Other borrowings, Estimated Fair Value 0 0
Subordinated debt, Estimated Fair Value 0 0
Derivative liabilities $ 0 $ 0