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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  |  | 9 Months Ended
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Sep. 30, 2014 | Mar. 31, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 FHLB Chicago | Sep. 30, 2014 Residential Loans Held For Investment at Fair Value FHLB Chicago | Sep. 30, 2014 Senior Notes due 2018 | Sep. 30, 2014 Long-term Debt Maximum | Dec. 31, 2013 Long-term Debt Maximum | Sep. 30, 2014 Commercial Secured Borrowings | Sep. 30, 2014 Trust Preferred Securities | Sep. 30, 2013 Trust Preferred Securities | Sep. 30, 2014 Subordinated Notes | Sep. 30, 2013 Subordinated Notes
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal home loan bank advances |  |  |  |  | $ 204,000,000 |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  | 0.2524% |  |  |  |  |  |  |  |  |
Weighted average maturity |  |  |  |  | 8 years 10 months 24 days |  |  |  |  |  |  |  |  |
Federal home loan bank advances, Maturity period, Rate |  |  |  |  | 91 days |  |  |  |  |  |  |  |  |
Amount on advances secured by residential mortgage loans |  |  |  |  |  | 238,326,000 |  |  |  |  |  |  |  |
Federal home loan bank stock | 4,846,000 |  | 4,846,000 |  | 4,846,000 |  |  |  |  |  |  |  |  |
Commercial mortgage loans |  |  |  |  |  |  |  |  |  | 66,000,000 |  |  |  |
Convertible notes |  | 287,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument interest rate |  | 4.625% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  | 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument redemption date |  | Apr. 15, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Interest expense yield | 5.49% |  | 5.44% |  |  |  |  |  |  |  | 2.58% | 2.65% | 2.58% | 2.65%
Accrued interest payable | 1,610,000 |  | 1,610,000 | 1,000,000 |  |  | 6,000,000 |  |  |  |  |  |  |
Convertible senior notes conversion rate |  |  | 41.1320 |  |  |  |  |  |  |  |  |  |  |
Debt instrument convertible base principal amount of conversion | 1,000 |  | 1,000 |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes conversion per share | $ 24.31 |  | $ 24.31 |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  | 40,000,000 |
Percentage of yield of debt securities |  |  |  |  |  |  |  |  |  |  | 6.88% | 6.90% | 6.88% | 6.90%
Accrued interest payable balance on long-term debt | $ 10,480,000 |  | $ 10,480,000 | $ 6,366,000 |  |  |  | $ 1,000,000 | $ 1,000,000 |  |  |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823 + Details
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