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Loans (Impaired Loans) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | $ 172,396 | $ 113,188 | $ 89,981
Recorded Investment With No Allowance | 68,726 | 55,172 | 60,944
Recorded Investment With Allowance | 76,884 | 38,851 | 16,534
Total Recorded Investment | 145,610 | 94,023 | 77,478
Related Allowance | 20,820 | 9,186 | 4,378
Average Recorded Investment | 113,907 | 102,163 | 54,768
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 60,781 | 40,288 | 26,067
Recorded Investment With No Allowance | 28,038 | 19,862 | 18,776
Recorded Investment With Allowance | 15,722 | 9,047 | 4,084
Total Recorded Investment | 43,760 | 28,909 | 22,860
Related Allowance | 7,553 | 5,436 | 2,378
Average Recorded Investment | 30,073 | 26,074 | 27,338
Commercial and Industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 99,606 | 60,522 | 25,240
Recorded Investment With No Allowance | 33,080 | 27,759 | 8,689
Recorded Investment With Allowance | 61,162 | 29,804 | 12,450
Total Recorded Investment | 94,242 | 57,563 | 21,139
Related Allowance | 13,267 | 3,750 | 2,000
Average Recorded Investment | 76,492 | 57,360 | 7,235
Commercial Real Estate, Buildings, Land and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 10,795 | 11,369 | 37,126
Recorded Investment With No Allowance | 6,394 | 6,866 | 32,425
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 6,394 | 6,866 | 32,425
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 6,164 | 17,729 | 18,211
Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 0 | 0 | 793
Recorded Investment With No Allowance | 0 | 0 | 569
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 0 | 0 | 569
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 438 | 1,320
Residential Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 1,214 | 977 | 755
Recorded Investment With No Allowance | 1,214 | 655 | 485
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 1,214 | 655 | 485
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 1,167 | 537 | 664
Consumer Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 0 | 32 | 0
Recorded Investment With No Allowance | 0 | 30 | 0
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 0 | 30 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | $ 11 | $ 25 | $ 0

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