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Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Allowance for Loan Losses for Non-covered Loans by Portfolio Class and Category (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | |||||||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
Non-Covered Loans
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Mar. 31, 2014
Non-Covered Loans
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Jun. 30, 2014
Non-Covered Loans
Commercial & Industrial
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Mar. 31, 2014
Non-Covered Loans
Commercial & Industrial
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Jun. 30, 2014
Non-Covered Loans
Commercial Real Estate Owner Occupied
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Mar. 31, 2014
Non-Covered Loans
Commercial Real Estate Owner Occupied
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Jun. 30, 2014
Non-Covered Loans
Commercial Real Estate Investor Owned
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Mar. 31, 2014
Non-Covered Loans
Commercial Real Estate Investor Owned
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Jun. 30, 2014
Non-Covered Loans
Construction and Land Development
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Mar. 31, 2014
Non-Covered Loans
Construction and Land Development
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Jun. 30, 2014
Non-Covered Loans
Residential Real Estate
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Mar. 31, 2014
Non-Covered Loans
Residential Real Estate
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Jun. 30, 2014
Non-Covered Loans
Consumer & Other
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Mar. 31, 2014
Non-Covered Loans
Consumer & Other
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| Summary of Activity in the Allowance for Loan Losses by Portfolio Class and Category Based on Impairment Method [Line Items] | ||||||||||||||||||
| Impaired Financing Receivable, Interest Income, Accrual Method | $ 6,000 | $ 0 | $ 15,000 | $ 29,000 | ||||||||||||||
| Allowance for Loan Losses [Roll Forward] | ||||||||||||||||||
| Balance | 27,905,000 | 27,289,000 | 12,858,000 | 12,246,000 | 4,357,000 | 4,096,000 | 6,375,000 | 6,600,000 | 1,987,000 | 2,136,000 | 2,076,000 | 2,019,000 | 252,000 | 192,000 | ||||
| Provision charged to expense | 1,348,000 | 1,027,000 | 3,068,000 | 899,000 | (262,000) | 589,000 | (2,064,000) | (9,000) | 132,000 | (532,000) | 412,000 | 16,000 | 62,000 | 64,000 | ||||
| Losses charged off | (1,093,000) | (1,369,000) | (1,005,000) | (474,000) | (88,000) | (336,000) | 0 | (250,000) | 0 | (305,000) | 0 | 0 | 0 | (4,000) | ||||
| Recoveries | 262,000 | 958,000 | 154,000 | 187,000 | 14,000 | 8,000 | 19,000 | 34,000 | 36,000 | 688,000 | 39,000 | 41,000 | 0 | 0 | ||||
| Balance | 28,422,000 | 27,905,000 | 15,075,000 | 12,858,000 | 4,021,000 | 4,357,000 | 4,330,000 | 6,375,000 | 2,155,000 | 1,987,000 | 2,527,000 | 2,076,000 | 314,000 | 252,000 | ||||
| Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 | $ 0 | ||||||||||||||||