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Loans - Impaired Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | $ 116,265 | $ 94,536
Recorded Investment With No Allowance | 14,505 | 12,120
Recorded Investment With Allowance | 80,265 | 58,101
Total Recorded Investment | 94,770 | 70,221
Related Allowance | 29,160 | 16,235
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 15,020 | 9,094
Recorded Investment With No Allowance | 4,874 | 2,842
Recorded Investment With Allowance | 7,280 | 4,287
Total Recorded Investment | 12,154 | 7,129
Related Allowance | 5,785 | 2,558
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 88,531 | 67,900
Recorded Investment With No Allowance | 4,777 | 6,817
Recorded Investment With Allowance | 65,800 | 39,890
Total Recorded Investment | 70,577 | 46,707
Related Allowance | 19,722 | 9,671
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 9,553 | 15,774
Recorded Investment With No Allowance | 3,864 | 2,168
Recorded Investment With Allowance | 5,015 | 12,517
Total Recorded Investment | 8,879 | 14,685
Related Allowance | 1,483 | 2,599
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 697 | 0
Recorded Investment With No Allowance | 697 | 0
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 697 | 0
Related Allowance | 0 | 0
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 293 | 293
Recorded Investment With No Allowance | 293 | 293
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 293 | 293
Related Allowance | 0 | 0
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 2,171 | 1,475
Recorded Investment With No Allowance | 0 | 0
Recorded Investment With Allowance | 2,170 | 1,407
Total Recorded Investment | 2,170 | 1,407
Related Allowance | $ 2,170 | $ 1,407

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