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Loans (Narrative) (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) Item | Dec. 31, 2015 USD ($) Item | Dec. 31, 2014 USD ($) | Nov. 30, 2016 | Dec. 31, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration of loans in a single industry in excess of ten percent | 0.00% | 0.00% |  |  |
Maximum percentage loan related to single industry | 10.00% | 10.00% |  |  |
Commercial and industrial loans related to overdraft for correspondent bank customer | $ 6,300,000 | $ 7,300,000 |  |  |
Minimum number of days to be considered past due | 90 days |  |  |  |
Troubled debt restructurings | $ 44,863,000 | 536,000 | $ 8,339,000 |  |
Interest income recognized subsequent to classification as impaired | $ 0 | $ 0 | 0 |  |
Number of loans restructured during the last year in excess of 90 days past due | Item | 2 | 1 |  |  |
Previously restructured loans past due | $ 3,200,000 | $ 259,000 |  |  |
Amount charged off related to loans restructured | 9,500,000 |  |  |  |
Proceeds from sale of loans | 30,470,000 | 0 | 0 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 4,100,000 | 88,000 |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 91,418,000 | $ 709,000 | 8,916,000 |  |
Number of days past due for payment of interest on loans, minimum | 120 days |  |  |  |
Texas Leading Index economic condition indicator |  | 123.0 |  | 121.9 |
Maximum origination value of loans which were subject to further refinement of valuation methodology | $ 1,000,000 |  |  |  |
General valuation allowance allocations for loan agreement monitoring exceptions | $ 153,045,000 | $ 135,859,000 | 99,542,000 |  | $ 92,438,000
Sensitivity stress test price shock | 75.00% |  |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
General valuation allowance allocations for loan agreement monitoring exceptions | $ 30,213,000 | $ 24,313,000 | 27,163,000 |  | 22,590,000
Commercial And Industrial Energy Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of loans related to a single industry | 11.60% | 15.30% |  |  |
Troubled debt restructurings | $ 43,841,000 | $ 0 | 0 |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 87,572,000 | 0 | 0 |  |
General valuation allowance allocations for loan agreement monitoring exceptions | 60,653,000 | 54,696,000 | 14,919,000 |  | 6,090,000
Non Accrual Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled debt restructurings | 44,900,000 | 536,000 |  |  |
Additional interest that would have been recognized on non-accrual loans, net of tax | 3,100,000 | 1,600,000 | 1,500,000 |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled debt restructurings | 1,022,000 | 536,000 | 5,391,000 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  | 627,000 |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 2,148,000 | 709,000 | 5,795,000 |  |
General valuation allowance allocations for loan agreement monitoring exceptions | $ 52,915,000 | 42,993,000 | 44,273,000 |  | $ 46,700,000
Grade 12 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
General percentage of valuation allowance in excess of principal balance, maximum | 30.00% |  |  |  |
Grade 13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
General percentage of valuation allowance in excess of principal balance, minimum | 30.00% |  |  |  |
Commercial and Industrial, Other Commercial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of days past due for payment of interest on loans, minimum | 180 days |  |  |  |
Commercial Real Estate Buildings Land And Other Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled debt restructurings | $ 0 | 0 | 2,948,000 |  |
Amount charged off related to loans restructured |  |  | 0 |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 1,455,000 | 0 | 3,121,000 |  |
Previously Restructured Loans Moved to OREO |  |  | 500,000 |  |
Commitments to Extend Credit [Member] | Commercial And Industrial Energy Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded balances | 1,100,000,000 |  |  |  |
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | 2,900,000 |  |
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 277,000 | $ 2,700,000 |  |
Standby Letters of Credit [Member] | Commercial And Industrial Energy Financing Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded balances | $ 37,400,000 |  |  |  |

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- Definition Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1243-112600 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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