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v3.3.1.900

Loans and Allowance for Credit Losses - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) Contract loan | Dec. 31, 2014 USD ($) Contract | Dec. 31, 2013 USD ($) Contract | Dec. 31, 2012 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for credit losses |  | $ 14,948,000 | $ 11,196,000 | $ 19,227,000 |
Charge-offs |  | 18,868,000 | 17,472,000 | $ 35,178,000 |
Recorded Investment | $ 50,844,000 | $ 50,844,000 | $ 55,251,000 |  |
Number of loans modified | Contract |  | 61 | 77 | 82 |
Total amount of loan modified | 10,956,000 | $ 10,956,000 | $ 15,967,000 | $ 7,713,000 |
Gain (loss) on sale of impaired loans |  | 400,000 | 77,000 |  |
Off balance sheet reserve to nonperforming loans |  |  | 14,000 |  |
Nonaccrual | 36,705,000 | 36,705,000 | 42,667,000 |  |
Loans held for sale | 5,763,000 | 5,763,000 | 2,502,000 |  |
Total gains or losses included in earnings |  | 111,000 | 77,000 |  |
Loans with modification to rate and payment due to amortization |  | $ 3,700,000 | 600,000 | 2,000,000 |
Minimum days required for conversion of trouble debt to be in default |  | 90 days |  |  |
Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded commitments related to nonperforming loans | 100,000 | $ 100,000 | 46,000 |  |
Unallocated [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for credit losses |  |  |  | (5,926,000) |
Charge-offs |  |  |  | $ 0 |
Consumer Loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non Accrual Status Of Loans After Number Of Days Past Due |  | 150 days |  |  |
Local Energy Company [Member] | Nonaccrual Commercial Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Chargeoffs of loans | 2,000,000 |  |  |  |
Nonaccrual | 3,900,000 | $ 3,900,000 |  |  |
Reserve for Off-balance Sheet Activities [Member] | Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Off balance sheet reserve to nonperforming loans | 0 | 0 |  |  |
Loans Held for Sale [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total gains or losses included in earnings |  | $ 0 | $ 77,000 |  |
Residential real estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of loans modified | Contract |  | 32 | 52 | 46 |
Total amount of loan modified | 1,575,000 | $ 1,575,000 | $ 2,062,000 | $ 2,316,000 |
Commercial real estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of loans modified | Contract |  | 1 | 1 | 5 |
Total amount of loan modified | 389,000 | $ 389,000 | $ 6,000 | $ 2,184,000 |
Manufacturer of Sporting Goods [Member] | Commercial and Industrial Sector [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 3,900,000 | 3,900,000 |  |  |
Oil and Gas Well Services Company [Member] | Commercial and Industrial Sector [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 7,500,000 | $ 7,500,000 |  |  |
Local Energy Company [Member] | Commercial and Industrial Sector [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of loans modified | loan |  | 2 |  |  |
Total amount of loan modified |  |  | $ 2,900,000 |  | $ 2,300,000
Chargeoffs of loans |  | $ 3,300,000 |  |  |
Nonaccrual | $ 5,600,000 | $ 5,600,000 |  |  |

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