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Loans (Impaired Loans) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | $ 113,188 | $ 89,981 | $ 69,656
Recorded Investment With No Allowance | 55,172 | 60,944 | 50,473
Recorded Investment With Allowance | 38,851 | 16,534 | 3,118
Total Recorded Investment | 94,023 | 77,478 | 53,591
Related Allowance | 9,186 | 4,378 | 1,680
Average Recorded Investment | 102,163 | 54,768 | 49,636
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 40,288 | 26,067 | 42,212
Recorded Investment With No Allowance | 19,862 | 18,776 | 29,007
Recorded Investment With Allowance | 9,047 | 4,084 | 2,853
Total Recorded Investment | 28,909 | 22,860 | 31,860
Related Allowance | 5,436 | 2,378 | 1,613
Average Recorded Investment | 26,074 | 27,338 | 27,154
Commercial and Industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 60,522 | 25,240 | 706
Recorded Investment With No Allowance | 27,759 | 8,689 | 636
Recorded Investment With Allowance | 29,804 | 12,450 | 0
Total Recorded Investment | 57,563 | 21,139 | 636
Related Allowance | 3,750 | 2,000 | 0
Average Recorded Investment | 57,360 | 7,235 | 571
Commercial Real Estate, Buildings, Land and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 11,369 | 37,126 | 22,919
Recorded Investment With No Allowance | 6,866 | 32,425 | 17,441
Recorded Investment With Allowance | 0 | 0 | 265
Total Recorded Investment | 6,866 | 32,425 | 17,706
Related Allowance | 0 | 0 | 67
Average Recorded Investment | 17,729 | 18,211 | 20,339
Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 0 | 793 | 3,007
Recorded Investment With No Allowance | 0 | 569 | 2,793
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 0 | 569 | 2,793
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 438 | 1,320 | 739
Residential Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 977 | 755 | 812
Recorded Investment With No Allowance | 655 | 485 | 596
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 655 | 485 | 596
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 537 | 664 | 674
Consumer Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid Contractual Principal Balance | 32 | 0 | 0
Recorded Investment With No Allowance | 30 | 0 | 0
Recorded Investment With Allowance | 0 | 0 | 0
Total Recorded Investment | 30 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | $ 25 | $ 0 | $ 159

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