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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Assets:    
Cash and cash equivalents, Carrying Amount $ 3,701,120 $ 3,846,346
Cash and cash equivalents, Estimated Fair Value 3,701,120 3,846,346
Debt securities, available for sale 2,571,139 2,376,860
Debt securities, held to maturity 1,032,037 1,103,170
Debt securities, held to maturity, fair value 972,628 1,046,439
Loans held for sale 357,640 340,317
Total loans and leases receivable, net of allowance for credit losses on loans and leases 12,765,935 12,726,456
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 12,551,635 12,513,386
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount 100,067 109,548
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 100,067 109,548
Derivative assets 21,437 17,931
Liabilities:    
Deposits held 17,961,383 17,920,236
Deposits, Estimated Fair Value 17,958,161 17,922,005
FHLB advances, Carrying Amount 1,195,088 1,203,207
FHLB advances, Estimated Fair Value 1,180,285 1,188,517
Other borrowings, Carrying Amount 123,905 123,840
Other borrowings, Estimated Fair Value 105,761 103,674
Subordinated debt, Carrying Amount 182,300 182,230
Subordinated debt, Estimated Fair Value 163,417 164,233
Derivative liabilities 31,958 27,110
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents, Estimated Fair Value 3,701,120 3,846,346
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
Derivative assets 0 0
Liabilities:    
Deposits, Estimated Fair Value 15,778,872 14,632,357
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 2,542,876 2,341,911
Debt securities, held to maturity, fair value 465,025 472,311
Loans held for sale 870 1,215
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 962,610 897,912
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 100,067 109,548
Derivative assets 21,360 17,906
Liabilities:    
Deposits, Estimated Fair Value 2,179,289 3,289,648
FHLB advances, Estimated Fair Value 1,180,285 1,188,517
Other borrowings, Estimated Fair Value 105,761 103,674
Subordinated debt, Estimated Fair Value 163,417 164,233
Derivative liabilities 31,958 27,110
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents, Estimated Fair Value 0 0
Debt securities, available for sale 28,263 34,949
Debt securities, held to maturity, fair value 507,603 574,128
Loans held for sale 356,770 339,102
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 11,589,025 11,615,474
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0
Derivative assets 77 25
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