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Subordinated Debentures/Notes (Details) (USD $) |  |  |  | 12 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 23, 2009 purchaser | Dec. 31, 2012 USB Capital Funding Corp | Dec. 31, 2012 Trust I | Dec. 31, 2012 Junior subordinated notes | Dec. 31, 2012 Trust preferred securities | Dec. 31, 2012 Interest Rate Swap | Dec. 31, 2012 Subordinated note | Sep. 30, 2012 Subordinated debt 7% Subordinated notes due April 20, 2022 | Apr. 20, 2012 Subordinated debt 7% Subordinated notes due April 20, 2022 purchaser
Preferred securities issued |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Junior subordinated debt purchased by Trust I |  |  |  |  |  | 15,500,000 |  |  |  |  |
Variable rate basis |  |  |  | three-month LIBOR plus 200 basis points |  |  | three-month LIBOR plus 148 basis points |  |  |  |
Basis spread on variable rate (percent) |  |  |  | 2.00% |  |  | 1.48% |  |  |  |
Subordinated debentures/notes | 80,250,000 | 75,250,000 |  | 25,000,000 |  |  |  |  |  |  |
Principal amount |  |  |  | 5,000,000 |  |  |  |  |  |  |
Principal amount outstanding larger multiple |  |  |  | 5,000,000 |  |  |  |  |  |  |
Three-month LIBOR rate | 0.31% |  |  |  |  |  |  |  |  |  |
Cash flow hedge against variability of cash flows related to subordinated debenture |  |  |  |  |  |  |  | 25,000,000 |  |  |
Number of purchasers |  |  | 38 |  |  |  |  |  |  |  |
Subordinated notes principal amount |  |  |  |  |  |  |  |  | 35,250,000 |  |
Portion of principal amount purchased by related parties |  |  |  |  |  |  |  |  | 14,050,000 |  |
Subordinated borrowing, number of purchasers |  |  |  |  |  |  |  |  |  |  | 56
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 30,000,000
Interest rate |  |  |  |  |  |  |  |  | 10.00% | 7.00% |
Purchase price as a percentage of principal amount |  |  |  |  |  |  |  |  |  |  | 100.00%
Repurchase amount as a percentage of principal |  |  |  |  |  |  |  |  |  |  | 100.00%

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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