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Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method (Details) (USD $)
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3 Months Ended | 6 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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Dec. 31, 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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Dec. 31, 2013
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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Dec. 31, 2013
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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Dec. 31, 2013
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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Dec. 31, 2013
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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Dec. 31, 2013
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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Dec. 31, 2013
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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Dec. 31, 2013
Non-Covered Loans
Consumer & Other
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| Summary of Recorded Investment in Non-covered Loans 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 - Ending Balance: | ||||||||||||||||||||||||||
| Individually evaluated for impairment | 1,861,000 | 1,550,000 | 1,178,000 | 736,000 | 298,000 | 107,000 | 0 | 0 | 375,000 | 703,000 | 10,000 | 4,000 | 0 | 0 | ||||||||||||
| Collectively evaluated for impairment | 26,561,000 | 25,739,000 | 13,897,000 | 11,510,000 | 3,723,000 | 3,989,000 | 4,330,000 | 6,600,000 | 1,780,000 | 1,433,000 | 2,517,000 | 2,015,000 | 314,000 | 192,000 | ||||||||||||
| Total | 28,422,000 | 27,905,000 | 27,289,000 | 15,075,000 | 12,858,000 | 12,246,000 | 4,021,000 | 4,357,000 | 4,096,000 | 4,330,000 | 6,375,000 | 6,600,000 | 2,155,000 | 1,987,000 | 2,136,000 | 2,527,000 | 2,076,000 | 2,019,000 | 314,000 | 252,000 | 192,000 | |||||
| Loans - Ending Balance: | ||||||||||||||||||||||||||
| Individually evaluated for Impairment | 22,065,000 | 20,840,000 | 4,649,000 | 3,380,000 | 4,276,000 | 606,000 | 5,174,000 | 6,811,000 | 7,422,000 | 9,484,000 | 544,000 | 559,000 | 0 | 0 | ||||||||||||
| Collectively evaluated for impairment | 2,229,037,000 | 2,116,473,000 | 1,130,420,000 | 1,038,196,000 | 365,107,000 | 341,025,000 | 380,914,000 | 430,877,000 | 129,621,000 | 107,548,000 | 173,420,000 | 157,968,000 | 49,555,000 | 40,859,000 | ||||||||||||
| Total | 2,250,023,000 | 2,136,292,000 | 1,135,069,000 | 1,041,576,000 | 369,383,000 | 341,631,000 | 386,088,000 | 437,688,000 | 137,043,000 | 117,032,000 | 173,964,000 | 158,527,000 | 48,476,000 | 39,838,000 | ||||||||||||
| Total | $ 2,251,102,000 | $ 2,251,102,000 | $ 2,137,313,000 | $ 2,251,102,000 | $ 2,137,313,000 | $ 49,555,000 | $ 40,859,000 | |||||||||||||||||||