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Loans - Unallocated Portion of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | $ 136,559 | $ 134,929 | $ 132,132 | $ 137,578 | $ 150,226 | $ 155,364
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 29,160 |  | 16,235 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 107,399 |  | 115,897 |  |  |
Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 68,531 |  | 65,398 |  |  |
Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 29,160 |  | 16,235 |  |  |
General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 20,182 |  | 22,100 |  |  |
Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 18,686 |  | 28,399 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 52,667 | 57,714 | 48,580 | 50,991 | 57,713 | 59,614
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 5,785 |  | 2,558 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 46,882 |  | 46,022 |  |  |
Commercial Portfolio Segment [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 28,872 |  | 25,351 |  |  |
Commercial Portfolio Segment [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,785 |  | 2,558 |  |  |
Commercial Portfolio Segment [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 10,866 |  | 10,062 |  |  |
Commercial Portfolio Segment [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,144 |  | 10,609 |  |  |
Commercial and industrial, Energy [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 33,346 | 25,818 | 29,052 | 31,445 | 37,313 | 51,528
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 19,722 |  | 9,671 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 13,624 |  | 19,381 |  |  |
Commercial and industrial, Energy [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,422 |  | 9,697 |  |  |
Commercial and industrial, Energy [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 19,722 |  | 9,671 |  |  |
Commercial and industrial, Energy [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,120 |  | 6,014 |  |  |
Commercial and industrial, Energy [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,082 |  | 3,670 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 35,353 | 35,914 | 38,777 | 39,204 | 38,918 | 30,948
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,483 |  | 2,599 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 33,870 |  | 36,178 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 22,051 |  | 20,817 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,483 |  | 2,599 |  |  |
Commercial Real Estate Portfolio Segment [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,349 |  | 4,366 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,470 |  | 10,995 |  |  |
Consumer Real Estate [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,884 | 5,637 | 6,103 | 6,194 | 6,336 | 5,657
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 4,884 |  | 6,103 |  |  |
Consumer Real Estate [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,641 |  | 2,688 |  |  |
Consumer Real Estate [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer Real Estate [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,172 |  | 1,671 |  |  |
Consumer Real Estate [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,071 |  | 1,744 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 10,309 | $ 9,846 | 9,620 | $ 9,744 | $ 9,946 | $ 7,617
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,170 |  | 1,407 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 8,139 |  | 8,213 |  |  |
Consumer and Other [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,545 |  | 6,845 |  |  |
Consumer and Other [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,170 |  | 1,407 |  |  |
Consumer and Other [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (325) |  | (13) |  |  |
Consumer and Other [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | $ 919 |  | $ 1,381 |  |  |

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