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Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash on hand or on deposit required | $ 176,600 | $ 188,900 |
Cash collateral on deposit | 14,700 | 16,900 |
Foreclosed Assets | 2,400 | 2,300 |
Accrued interest receivable and other assets | 396,654 | 340,018 |
Junior subordinated deferrable interest debentures | 136,127 | 136,069 |
Other long-term borrowings, net of unamortized issuance costs | 99,990 | 99,870 |
Income Tax Expense (Benefit) | $ 37,150 | $ 40,471 | $ 58,047
Earnings Per Share, Diluted | $ 4.70 | $ 4.28 | $ 4.29
Excess Tax Benefit from Share-based Compensation, Operating Activities | $ 5,063 | $ 1,434 | $ 3,202
Minimum [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Range of change in fair value of derivative hedging instrument to be considered highly effective | 80.00% |  |
Maximum [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Range of change in fair value of derivative hedging instrument to be considered highly effective | 125.00% |  |
Adjustments for New Accounting Pronouncement [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accrued interest receivable and other assets |  | (1,200) |
Junior subordinated deferrable interest debentures |  | 1,000 |
Other long-term borrowings, net of unamortized issuance costs |  | 130 |
Income Tax Expense (Benefit) | $ 5,100 |  |
Earnings Per Share, Diluted | $ 0.08 |  |
Excess Tax Benefit from Share-based Compensation, Operating Activities |  | 1,400 | 3,200
Excess Tax Benefit from Share-based Compensation, Financing Activities |  | $ (1,400) | $ (3,200)

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