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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Assets:    
Cash and cash equivalents, Carrying Amount $ 2,046,685 $ 455,806
Cash and cash equivalents, Estimated Fair Value 2,046,685 455,806
Debt securities, available for sale 2,900,259 2,961,015
Debt securities, held to maturity 870,294 840,259
Investment securities held to maturity 836,713 793,813
Loans held for sale 424,057 328,312
Total loans and leases receivable, net of allowance for credit losses on loans and leases 14,508,696 15,335,435
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 13,973,288 14,890,823
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount 124,733 74,196
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 124,733 74,196
Derivative assets 34,751 44,435
Liabilities:    
Deposits held 17,723,617 18,156,953
Deposits, Estimated Fair Value 17,707,705 18,127,338
FHLB advances, Carrying Amount 2,052,143 800,000
FHLB advances, Estimated Fair Value 2,047,365 781,113
Other borrowings, Carrying Amount 123,645 123,580
Other borrowings, Estimated Fair Value 108,381 108,081
Subordinated debt, Carrying Amount 182,021 181,952
Subordinated debt, Estimated Fair Value 152,769 168,441
Derivative liabilities 32,999 42,106
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents, Estimated Fair Value 2,046,685 455,806
Debt securities, available for sale 0 0
Investment securities held to maturity 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 12,222,811 13,907,087
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 2,836,883 2,887,749
Investment securities held to maturity 516,978 437,680
Loans held for sale 16,314 322
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 1,247,367 1,323,312
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 124,733 74,196
Derivative assets 34,686 44,380
Liabilities:    
Deposits, Estimated Fair Value 5,484,894 4,220,251
FHLB advances, Estimated Fair Value 2,047,365 781,113
Other borrowings, Estimated Fair Value 108,381 108,081
Subordinated debt, Estimated Fair Value 152,769 168,441
Derivative liabilities 32,999 42,106
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents, Estimated Fair Value 0 0
Debt securities, available for sale 63,376 73,266
Investment securities held to maturity 319,735 356,133
Loans held for sale 407,743 327,990
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 12,725,921 13,567,511
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0
Derivative assets 65 55
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