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Disclosures about Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Assets:    
Cash and cash equivalents, carrying value $ 3,846,346 $ 455,806
Cash and cash equivalents, fair value 3,846,346 455,806
Debt securities, available for sale 2,376,860 2,961,015
Debt securities, held to maturity, carrying value 1,103,170 840,259
Debt securities, held to maturity, fair value 1,046,439 793,813
Loans held for sale 340,317 328,312
Total loans and leases receivable, net of allowance for credit losses on loans and leases, carrying value 12,726,456 15,335,435
Total loans and leases receivable, net of allowance for credit losses on loans and leases, fair value 12,513,386 14,890,823
FHLB, Federal Reserve Bank and other restricted stock, carrying value 109,548 74,196
FHLB, Federal Reserve Bank and other restricted stock, fair value 109,548 74,196
Derivatives 17,931 44,435
Liabilities:    
Deposits, carrying value 17,920,236 18,156,953
Deposits, fair value 17,922,005 18,127,338
FHLB advances, carrying value 1,203,207 800,000
FHLB advances, fair value 1,188,517 781,113
Other borrowings, carrying value 123,840 123,580
Other borrowings, fair value 103,674 108,081
Subordinated debt, carrying value 182,230 181,952
Subordinated debt, fair value 164,233 168,441
Derivatives $ 27,110 $ 42,106
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accrued interest payable and other liabilities Accrued interest payable and other liabilities
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents, fair value $ 3,846,346 $ 455,806
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, fair value 0 0
FHLB, Federal Reserve Bank and other restricted stock, fair value 0 0
Derivatives 0 0
Liabilities:    
Deposits, fair value 14,632,357 13,907,087
FHLB advances, fair value 0 0
Other borrowings, fair value 0 0
Subordinated debt, fair value 0 0
Derivatives 0 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents, fair value 0 0
Debt securities, available for sale 2,341,911 2,887,749
Debt securities, held to maturity, fair value 472,311 437,680
Loans held for sale 1,215 322
Total loans and leases receivable, net of allowance for credit losses on loans and leases, fair value 897,912 1,323,312
FHLB, Federal Reserve Bank and other restricted stock, fair value 109,548 74,196
Derivatives 17,906 44,380
Liabilities:    
Deposits, fair value 3,289,648 4,220,251
FHLB advances, fair value 1,188,517 781,113
Other borrowings, fair value 103,674 108,081
Subordinated debt, fair value 164,233 168,441
Derivatives 27,110 42,106
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents, fair value 0 0
Debt securities, available for sale 34,949 73,266
Debt securities, held to maturity, fair value 574,128 356,133
Loans held for sale 339,102 327,990
Total loans and leases receivable, net of allowance for credit losses on loans and leases, fair value 11,615,474 13,567,511
FHLB, Federal Reserve Bank and other restricted stock, fair value 0 0
Derivatives 25 55
Liabilities:    
Deposits, fair value 0 0
FHLB advances, fair value 0 0
Other borrowings, fair value 0 0
Subordinated debt, fair value 0 0
Derivatives $ 0 $ 0