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Loans - Non-Accrual Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | $ 57,250 | $ 61,449
Non-accrual with no credit loss allowance | 22,340 | 21,911
Commercial Portfolio Segment [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 16,169 | 19,849
Non-accrual with no credit loss allowance | 4,185 | 4,479
Commercial and Industrial Total Energy Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 25,783 | 23,168
Non-accrual with no credit loss allowance | 7,701 | 639
Paycheck Protection Program [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 0 | 0
Non-accrual with no credit loss allowance | 0 | 0
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 13,180 | 15,737
Non-accrual with no credit loss allowance | 9,633 | 14,116
Construction Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 1,667 | 1,684
Non-accrual with no credit loss allowance | 673 | 1,684
Total consumer real estate loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 451 | 993
Non-accrual with no credit loss allowance | 148 | 993
Consumer Loan [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 0 | 18
Non-accrual with no credit loss allowance | $ 0 | $ 0

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- Definition Amount of financing receivable on nonaccrual status with no allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
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