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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended |  |  |  |
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Jan. 19, 2012 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 12, 2011 Fbc Financial Corporation [Member] | Jul. 12, 2011 1st Bank Oklahoma [Member]
Recent Transactions Including Mergers Acquisitions [Line Items] |  |  |  |  |  |  |
Pretax gain on sale of investments | $ 4,500,000 |  |  |  |  |  |
Gain on sale of investments, Net of tax | 2,600,000 |  |  |  |  |  |
Premium paid above equity capital |  |  |  |  |  | 1,500,000 |
Total assets |  |  | 6,038,974,000 | 6,022,250,000 | 5,608,825,000 |  | 217,000,000
Loans |  |  | 3,348,112,000 | 3,203,702,000 |  |  | 116,000,000
Deposits |  |  | 5,419,519,000 | 5,440,830,000 |  |  | 178,000,000
Equity capital |  |  | 556,997,000 | 519,567,000 | 483,041,000 |  | 18,000,000
Prepaid deposit insurance |  |  |  | 9,700,000 |  |  |
Refunds received for overpayment |  | $ 9,600,000 |  |  |  |  |

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