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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	$ 515,364	$ 693,354
Cash and cash equivalents, Estimated Fair Value	515,364	693,354
Debt securities, available for sale	1,437,077	1,206,431
Equity securities	4,827	3,854
Loans held for sale	46,106	79,086
Total loans and leases receivable, net of allowance for credit losses on loans and leases	15,993,464	15,608,989
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value	16,487,438	16,222,202
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount	69,420	71,368
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	69,420	71,368
Derivative assets	36,502	54,223
Deposits, Carrying Amount	12,472,440	11,309,929
Deposits, Estimated Fair Value	12,473,798	11,312,494
FRB PPP Liquidity Facility, Carrying Amount	3,284,156	4,415,016
FRB PPP Liquidity Facility, Estimated Fair Value	3,284,156	4,415,016
Federal funds purchased, Carrying Amount	365,000	250,000
Federal funds purchased, Estimated Fair Value	365,000	250,000
FHLB advances, Carrying Amount	850,000	850,000
FHLB advances, Estimated Fair Value	850,787	852,442
Other borrowings, Carrying Amount	124,138	124,037
Other borrowings, Estimated Fair Value	135,571	129,120
Subordinated debt, Carrying Amount	181,464	181,394
Subordinated debt, Estimated Fair Value	197,080	193,119
Derivative liabilities	37,536	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	515,364	693,354
Debt securities, available for sale	0	0
Equity securities	4,827	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	11,806,559	10,657,998
FRB PPP Liquidity Facility, Estimated Fair Value	0	0
Federal funds purchased, Estimated Fair Value	365,000	250,000
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)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Estimated Fair Value	0	0
Debt securities, available for sale	1,437,077	1,206,431
Equity securities	0	0
Loans held for sale	45,463	78,443
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value	3,407,622	3,616,432
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	69,420	71,368
Derivative assets	36,306	54,023
Deposits, Estimated Fair Value	667,239	654,496
FRB PPP Liquidity Facility, Estimated Fair Value	3,284,156	4,415,016
Federal funds purchased, Estimated Fair Value	0	0
FHLB advances, Estimated Fair Value	850,787	852,442
Other borrowings, Estimated Fair Value	135,571	129,120
Subordinated debt, Estimated Fair Value	197,080	193,119
Derivative liabilities	37,536	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	0	0
Equity securities	0	0
Loans held for sale	643	643
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value	13,079,816	12,605,770
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	0	0
Derivative assets	196	200
Deposits, Estimated Fair Value	0	0
FRB PPP Liquidity Facility, Estimated Fair Value	0	0
Federal funds purchased, 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

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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