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Loans - Impaired Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | $ 85,733 | $ 94,536
Recorded Investment With No Allowance | 15,810 | 12,120
Recorded Investment With Allowance | 52,392 | 58,101
Total Recorded Investment | 68,202 | 70,221
Related Allowance | 18,836 | 16,235
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 18,536 | 9,094
Recorded Investment With No Allowance | 4,455 | 2,842
Recorded Investment With Allowance | 12,267 | 4,287
Total Recorded Investment | 16,722 | 7,129
Related Allowance | 6,276 | 2,558
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 55,043 | 67,900
Recorded Investment With No Allowance | 5,866 | 6,817
Recorded Investment With Allowance | 33,946 | 39,890
Total Recorded Investment | 39,812 | 46,707
Related Allowance | 9,721 | 9,671
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 10,329 | 15,774
Recorded Investment With No Allowance | 5,196 | 2,168
Recorded Investment With Allowance | 4,760 | 12,517
Total Recorded Investment | 9,956 | 14,685
Related Allowance | 1,420 | 2,599
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 0 | 0
Recorded Investment With No Allowance | 0 | 0
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 0 | 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 | 1,532 | 1,475
Recorded Investment With No Allowance | 0 | 0
Recorded Investment With Allowance | 1,419 | 1,407
Total Recorded Investment | 1,419 | 1,407
Related Allowance | $ 1,419 | $ 1,407

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