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Summary of Significant Accounting Policies - Additional information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Significant Accounting Policies [Line Items] |  |  |
Reserve and clearing requirement balance | $ 0 |  |
Effect of derivative instrument | 0 | 9,000 |
Servicing assets: |  |  |
Payment of cash dividends on Preferred Stock | 0 | 3,600,000 |
Payments of cash dividends on Common Stock | 19,700,000 | 3,900,000 |
Common stock dividends declared, but unpaid | 0 | 0 |
Computer equipment |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |
Premises and equipment, estimated useful lives | 5 years |  |
Computer software |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |
Premises and equipment, estimated useful lives | 3 years |  |
SBA loans |  |  |
Servicing assets: |  |  |
Servicing assets capitalized during the period | 4,700,000 | 2,000,000 | 1,300,000
Amortization of servicing assets during the period | 2,014,000 | 1,347,000 | 706,000
Carrying value of servicing asset | $ 8,900,000 | $ 6,300,000 |
Minimum | Buildings |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |
Premises and equipment, estimated useful lives | 15 years |  |
Minimum | Furniture , fixture and equipment |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |
Premises and equipment, estimated useful lives | 3 years |  |
Maximum | Buildings |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |
Premises and equipment, estimated useful lives | 30 years |  |
Maximum | Furniture , fixture and equipment |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |
Premises and equipment, estimated useful lives | 7 years |  |
3- Month London Interbank Offered Rate (LIBOR) |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |
Strike level of interest rate cap agreement | 2.00% |  |
Interest rate cap |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |
Interest rate cap agreement terms | 3 years |  |

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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
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