Fair Value Measurement of Assets and Liabilities - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Interest bearing deposits with banks	$ 177,088	$ 172,800
Investment securities held to maturity	2,034,943	1,837,620
Accrued interest receivable	95,296	73,990
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits with stated maturities	7,063,984	3,563,521
Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	2,068,246	1,842,691
Carrying Amount \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and due from banks	251,541	234,310
Interest bearing deposits with banks	177,088	172,800
Accrued interest receivable	95,296	73,990
Federal Reserve Bank and Federal Home Loan Bank stock	232,080	178,668
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits without stated maturities	17,388,990	14,589,941
Short-term borrowings	2,118,914	748,628
Accrued interest payable	25,762	14,161
Carrying Amount \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Treasury securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	138,517	138,676
Carrying Amount \| Significant Other Observable Inputs (Level 2)
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits with stated maturities	7,063,984	3,563,521
Long-term borrowings	1,654,268	2,315,819
Junior subordinated debentures issued to capital trusts	55,370	41,774
Carrying Amount \| Significant Other Observable Inputs (Level 2) \| U.S. government agency securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	8,721	9,859
Carrying Amount \| Significant Other Observable Inputs (Level 2) \| Obligations of states and political subdivisions
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	585,656	465,878
Carrying Amount \| Significant Other Observable Inputs (Level 2) \| Residential mortgage-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	1,266,770	1,131,945
Carrying Amount \| Significant Other Observable Inputs (Level 2) \| Trust preferred securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	37,332	49,824
Carrying Amount \| Significant Other Observable Inputs (Level 2) \| Corporate and other debt securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	31,250	46,509
Carrying Amount \| Significant Unobservable Inputs (Level 3)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Net loans	24,883,610	18,210,724
Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	2,034,943	1,837,620
Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and due from banks	251,541	234,310
Interest bearing deposits with banks	177,088	172,800
Accrued interest receivable	95,296	73,990
Federal Reserve Bank and Federal Home Loan Bank stock	232,080	178,668
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits without stated maturities	17,388,990	14,589,941
Short-term borrowings	2,091,892	679,316
Accrued interest payable	25,762	14,161
Fair Value \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Treasury securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	142,049	145,257
Fair Value \| Significant Other Observable Inputs (Level 2)
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits with stated maturities	7,005,573	3,465,373
Long-term borrowings	1,751,194	2,453,797
Junior subordinated debentures issued to capital trusts	55,692	37,289
Fair Value \| Significant Other Observable Inputs (Level 2) \| U.S. government agency securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	8,641	9,981
Fair Value \| Significant Other Observable Inputs (Level 2) \| Obligations of states and political subdivisions
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	586,033	477,479
Fair Value \| Significant Other Observable Inputs (Level 2) \| Residential mortgage-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	1,235,605	1,118,044
Fair Value \| Significant Other Observable Inputs (Level 2) \| Trust preferred securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	31,486	40,088
Fair Value \| Significant Other Observable Inputs (Level 2) \| Corporate and other debt securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	31,129	46,771
Fair Value \| Significant Unobservable Inputs (Level 3)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Net loans	$ 24,068,755	$ 17,562,153

Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount of time deposit liabilities, including certificates of deposit.

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Long term borrowings fair value disclosure

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