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Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
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 | $ 2,401 | $ 2,880 | $ 14,462 | $ 14,629 |
Unfunded commitments related to nonperforming loans | 500 |  | 500 |  | $ 0
Off balance sheet reserve to nonperforming loans | 0 |  | 0 |  | 0
Loans held for sale | 0 |  | 0 |  |
Impaired Loans Sold |  |  | 2,400 |  |
Gain on impaired loans sold |  |  | 400 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | 0 | 0 | 3,112 |
Total gains or losses included in earnings | 0 | 0 | 105 | 77 |
Nonaccrual | 28,803 |  | 28,803 |  | 42,667
Recorded investment | 40,827 |  | $ 40,827 |  | $ 55,251
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 | 0 | 100 | $ 400 | 500 |
Loans Held For Sale [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 0 |  | 3,112 |
Total gains or losses included in earnings |  | $ 0 |  | $ 77 |
Non Accrual Loans [Member] | Industrial Manufacturer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 6,100 |  | 6,100 |  |
Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 5,700 |  | 5,700 |  |
2012 Troubled Debt Restructuring [Member] | Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 2,300 |  | 2,300 |  |
Charge-off recognized |  |  | 3,300 |  |
2014 Troubled Debt Restructuring [Member] | Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | $ 2,900 |  | $ 2,900 |  |

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