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Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non Accrual Status Of Loans After Number Of Days Past Due |  |  | 90 days |  |
Default Status Of TDRs After Number Of Days Past Due |  |  | 90 days |  |
Charge-offs | $ 6,138 | $ 4,952 | $ 9,646 | $ 12,061 |
Unfunded commitments related to nonperforming loans | 2,200 |  | 2,200 |  | $ 100
Off balance sheet reserve to nonperforming loans | 0 |  | 0 |  | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | 0 | 0 | 0 |
Total gains or losses included in earnings | 0 | 0 | 0 | 105 |
Nonaccrual | 48,076 |  | 48,076 |  | 36,705
Recorded investment | 64,408 |  | $ 64,408 |  | $ 50,844
Loans to individuals [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non Accrual Status Of Loans After Number Of Days Past Due |  |  | 150 days |  |
Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans with modifications to rate and payment due to reamortization | 300 | $ 100 | $ 4,200 | $ 400 |
Non Accrual Loans [Member] | Steel and Aluminum Servicing Company [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 11,400 |  | 11,400 |  |
Non Accrual Loans [Member] | Coal Industry Manufacturer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 10,500 |  | 10,500 |  |
Non Accrual Loans [Member] | Oil and Gas Well Services Company [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 4,400 |  | 4,400 |  |
Charge-off recognized |  |  | 2,000 |  |
Non Accrual Loans [Member] | Industrial Manufacturer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 3,500 |  | 3,500 |  |
Charge-off recognized |  |  | 200 |  |
Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 3,700 |  | 3,700 |  |
2012 Troubled Debt Restructuring [Member] | Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 1,300 |  | 1,300 |  |
Charge-off recognized |  |  | 1,100 |  |
2014 Troubled Debt Restructuring [Member] | Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | $ 2,400 |  | $ 2,400 |  |

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