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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, Carrying Amount $ 1,052,054 $ 693,354
Cash and cash equivalents, Estimated Fair Value 1,052,054 693,354
Debt securities, available for sale 1,861,697 1,206,431
Equity securities 5,000 3,854
Loans held for sale 29,957 79,086
Total loans and leases receivable, net of allowance for credit losses on loans and leases 15,354,084 15,608,989
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 15,323,107 16,222,202
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount 57,184 71,368
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 57,184 71,368
Derivative assets 34,234 54,223
Deposits, Carrying Amount 16,971,025 11,309,929
Deposits, Estimated Fair Value 16,971,434 11,312,494
FRB PPP Liquidity Facility, Carrying Amount 0 4,415,016
FRB PPP Liquidity Facility, Estimated Fair Value   4,415,016
Federal funds purchased, Carrying Amount 0 250,000
Federal funds purchased, Estimated Fair Value   250,000
FHLB advances, Carrying Amount 0 850,000
FHLB advances, Estimated Fair Value   852,442
Other borrowings, Carrying Amount 223,151 124,037
Other borrowings, Estimated Fair Value 229,582 129,120
Subordinated debt, Carrying Amount 181,603 181,394
Subordinated debt, Estimated Fair Value 200,080 193,119
Derivative liabilities 34,573 98,164
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, Estimated Fair Value 1,052,054 693,354
Debt securities, available for sale 0 0
Equity securities   3,854
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
Deposits, Estimated Fair Value 16,377,876 10,657,998
FRB PPP Liquidity Facility, Estimated Fair Value   0
Federal funds purchased, Estimated Fair Value   250,000
FHLB advances, Estimated Fair Value   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)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, Estimated Fair Value 0 0
Debt securities, available for sale 1,796,080 1,206,431
Equity securities   0
Loans held for sale 29,449 78,443
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 2,557,624 3,616,432
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 57,184 71,368
Derivative assets 34,071 54,023
Deposits, Estimated Fair Value 593,558 654,496
FRB PPP Liquidity Facility, Estimated Fair Value   4,415,016
Federal funds purchased, Estimated Fair Value   0
FHLB advances, Estimated Fair Value   852,442
Other borrowings, Estimated Fair Value 229,582 129,120
Subordinated debt, Estimated Fair Value 200,080 193,119
Derivative liabilities 34,573 98,164
Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, Estimated Fair Value 0 0
Debt securities, available for sale 65,617 0
Equity securities   0
Loans held for sale 508 643
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 12,765,483 12,605,770
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0
Derivative assets 163 200
Deposits, Estimated Fair Value 0 0
FRB PPP Liquidity Facility, Estimated Fair Value   0
Federal funds purchased, Estimated Fair Value   0
FHLB advances, Estimated Fair Value   0
Other borrowings, Estimated Fair Value 0 0
Subordinated debt, Estimated Fair Value 0 0
Derivative liabilities $ 0 $ 0