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Loans (Impaired Loans) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | $ 128,536 | $ 94,536 | $ 172,396
Recorded Investment With No Allowance | 21,842 | 12,120 | 68,726
Recorded Investment With Allowance | 77,611 | 58,101 | 76,884
Total Recorded Investment | 99,453 | 70,221 | 145,610
Related Allowance | 28,483 | 16,235 | 20,820
Average Recorded Investment | 84,352 | 108,127 | 113,907
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 30,909 | 9,094 | 60,781
Recorded Investment With No Allowance | 11,588 | 2,842 | 28,038
Recorded Investment With Allowance | 12,772 | 4,287 | 15,722
Total Recorded Investment | 24,360 | 7,129 | 43,760
Related Allowance | 7,849 | 2,558 | 7,553
Average Recorded Investment | 14,913 | 18,246 | 30,073
Commercial and Industrial Total Energy Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 87,103 | 67,900 | 99,606
Recorded Investment With No Allowance | 2,764 | 6,817 | 33,080
Recorded Investment With Allowance | 62,480 | 39,890 | 61,162
Total Recorded Investment | 65,244 | 46,707 | 94,242
Related Allowance | 20,246 | 9,671 | 13,267
Average Recorded Investment | 53,563 | 75,453 | 76,492
Commercial Real Estate, Buildings, Land and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 9,252 | 15,774 | 10,795
Recorded Investment With No Allowance | 6,255 | 2,168 | 6,394
Recorded Investment With Allowance | 2,354 | 12,517 | 0
Total Recorded Investment | 8,609 | 14,685 | 6,394
Related Allowance | 383 | 2,599 | 0
Average Recorded Investment | 13,690 | 12,799 | 6,164
Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 697 | 0 | 0
Recorded Investment With No Allowance | 665 | 0 | 0
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 665 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 354 | 0 | 0
Total consumer real estate loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 570 | 293 | 1,214
Recorded Investment With No Allowance | 570 | 293 | 1,214
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 570 | 293 | 1,214
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 547 | 704 | 1,167
Consumer Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 5 | 1,475 | 0
Recorded Investment With No Allowance | 0 | 0 | 0
Recorded Investment With Allowance | 5 | 1,407 | 0
Total Recorded Investment | 5 | 1,407 | 0
Related Allowance | 5 | 1,407 | 0
Average Recorded Investment | $ 1,285 | $ 925 | $ 11

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