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Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Non-covered Loans Individually Evaluated for Impairment by Category (Details) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | |||||
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Jun. 30, 2014
loan
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Jun. 30, 2013
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Jun. 30, 2014
loan
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Jun. 30, 2013
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Jun. 30, 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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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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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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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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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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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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Dec. 31, 2013
Non-Covered Loans
Consumer & Other
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Jun. 30, 2014
Unadvanced Commitment on Impaired Loan
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Dec. 31, 2013
Unadvanced Commitment on Impaired Loan
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| Financing Receivable, Impaired [Line Items] | ||||||||||||||||||||
| Unpaid Contractual Principal Balance | $ 23,180,000 | $ 24,243,000 | $ 6,229,000 | $ 4,377,000 | $ 3,315,000 | $ 606,000 | $ 5,174,000 | $ 8,033,000 | $ 7,917,000 | $ 10,668,000 | $ 545,000 | $ 559,000 | $ 0 | $ 0 | ||||||
| Recorded Investment With No Allowance | 5,309,000 | 15,122,000 | 4,059,000 | 0 | 778,000 | 201,000 | 0 | 7,190,000 | 441,000 | 7,383,000 | 31,000 | 348,000 | 0 | 0 | ||||||
| Recorded Investment With Allowance | 13,978,000 | 6,445,000 | 0 | 3,384,000 | 1,310,000 | 421,000 | 5,174,000 | 0 | 6,981,000 | 2,419,000 | 513,000 | 221,000 | 0 | 0 | ||||||
| Total Recorded Investment | 19,287,000 | 21,567,000 | 4,059,000 | 3,384,000 | 2,088,000 | 622,000 | 5,174,000 | 7,190,000 | 7,422,000 | 9,802,000 | 544,000 | 569,000 | 0 | 0 | ||||||
| Related Allowance | 1,616,000 | 933,000 | 298,000 | 0 | 375,000 | 10,000 | 0 | |||||||||||||
| Average Recorded Investment | 18,000,000 | 27,490,000 | 4,315,000 | 6,574,000 | 1,229,000 | 1,868,000 | 3,623,000 | 11,348,000 | 7,902,000 | 5,770,000 | 540,000 | 1,930,000 | 391,000 | 0 | ||||||
| Table Text Block Supplement [Abstract] | ||||||||||||||||||||
| Number of loans over 90 days past due and still accruing | 0 | 0 | ||||||||||||||||||
| Interest lost on impaired loans | 362,000 | 681,719 | ||||||||||||||||||
| Impaired Financing Receivable, Interest Income, Cash Basis Method | 9,000 | 32,000 | ||||||||||||||||||
| Impaired Financing Receivable, Interest Income, Accrual Method | 6,000 | 0 | 15,000 | 29,000 | ||||||||||||||||
| Loans and Leases Receivable, Impaired Loans, Commitment to Lend | 0 | 79,000 | ||||||||||||||||||
| Estimated losses attributable to unadvanced commitments on impaired loans | $ 150,000 | $ 150,000 | ||||||||||||||||||