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Business Combinations (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 BancTrust Financial Group, Inc. [Member] | Mar. 31, 2012 BancTrust Financial Group, Inc. [Member] | Jun. 30, 2012 Bay Bank and Trust Company [Member] | Mar. 31, 2012 Bay Bank and Trust Company [Member] | Sep. 30, 2012 Bay Bank and Trust Company [Member] | Mar. 16, 2012 Bay Bank and Trust Company [Member] | Sep. 30, 2011 Heritage Banking Group Business Acquisition [Member] | Apr. 15, 2011 Heritage Banking Group Business Acquisition [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proposed business acquisition, number of offices to be acquired |  |  |  |  | 49 |  |  |  |  |  |  |
Proposed business acquisition, loans to be acquired |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |
Age of acquired entity (in years) |  |  |  |  |  |  |  |  |  | 76 |  | 90
FDIC loss-share transaction asset coverage agreement |  | 151,900,000 |  | 151,900,000 |  |  |  |  |  |  |  |
FDIC loss-share agreement covered loan and other real estate losses (in hundredths) |  | 80.00% |  | 80.00% |  |  |  |  |  |  |  |
FDIC loss-share agreement term for single family residential mortgage loans and foreclosed real estate |  | 10 years |  | 10 years |  |  |  |  |  |  |  |
FDIC loss-share agreement term for commercial loans and related foreclosures |  | 5 years |  | 5 years |  |  |  |  |  |  |  |
FDIC loss-share agreement reimbursement term for recoveries of covered losses |  | 3 years |  | 3 years |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  |  |  |  |  |  |  |  | 88,154,000 |  | 50,447,000
Federal funds sold |  |  |  |  |  |  |  |  |  |  |  | 1,000,000
Securities available for sale |  |  |  |  |  |  |  |  |  | 26,369,000 |  | 6,389,000
Acquired noncovered loans |  |  |  |  |  |  |  |  |  | 97,914,000 |  | 9,644,000
Acquired covered loans |  |  |  |  |  |  |  |  |  |  |  | 97,770,000
Premises and equipment, net |  |  |  |  |  |  |  |  |  | 9,466,000 |  | 55,000
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | 7,017,000 |  | 902,000
Other real estate |  |  |  |  |  |  |  |  |  | 2,569,000 |  |
Covered other real estate |  |  |  |  |  |  |  |  |  |  |  | 7,485,000
FDIC indemnification asset |  |  |  |  |  |  |  |  |  |  |  | 33,333,000
Other assets |  |  |  |  |  |  |  |  |  | 3,471,000 |  | 218,000
Proposed Business Acquisition Equity to be Issued Per Share Of Acquired Company (in dollars per share) |  |  |  |  | 0.125 |  |  |  |  |  |  |
Proposed Business combination price per share of stock issued (in dollars per share) |  |  |  |  | $ 24.66 |  |  |  |  |  |  |
Proposed Business Acquisition Share Price (per share) |  |  |  |  | 3.08 |  |  |  |  |  |  |
Preferred stock and warrants to be repurchased |  |  |  |  | 50,000,000 |  |  |  |  |  |  |
Total assets acquired | 234,960,000 | 207,243,000 | 234,960,000 | 207,243,000 |  |  |  |  |  | 234,960,000 |  | 207,243,000
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  | 1,800,000,000 |  |  |  | 208,796,000 |  | 204,349,000
Short-term borrowings |  |  |  |  |  |  |  |  |  |  |  | 23,157,000
Other liabilities |  |  |  |  |  |  |  |  |  | 526,000 |  | 730,000
Total Liabilities |  |  |  |  |  |  |  |  |  | 209,322,000 |  | 228,236,000
Net assets acquired at fair value |  |  |  |  |  |  |  |  |  | 25,638,000 |  | (20,993,000)
Consideration paid to acquiree |  |  |  |  |  |  |  |  | 22,003,000 |  |  |
Proposed business acquisition, cost of acquired entity |  |  |  |  | 55,400,000 |  |  |  |  |  |  |
Cash received on acquisition |  |  |  |  |  |  |  |  |  |  | 28,449,000 |
Bargain purchase gain |  |  | 3,635,000 | 7,456,000 |  |  | 881,000 | 2,800,000 | 3,635,000 |  | 7,456,000 |
Income taxes |  |  |  |  |  |  |  |  | 0 |  | 2,852,000 |
Bargain purchase gain, net of taxes |  |  |  |  |  |  |  |  | 3,635,000 |  | 4,604,000 |
Business acquisition, cost of acquired entity, cash paid |  |  |  |  |  |  |  |  |  | 10,000,000 |  |
Proposed business acquisition, equity to be issued (in shares) |  |  |  |  | 2,245,923 |  |  |  |  |  |  |
Business acquisition, equity issued (in shares) |  |  |  |  |  |  |  |  | 510,000 |  |  |
Business acquisition, equity issued, value assigned |  |  |  |  |  |  |  |  |  | 12,000,000 |  |
Business acquisition, total transaction expenses |  |  |  |  |  |  |  | 2,600,000 |  |  |  |
Business acquisition, severance expense |  |  |  |  |  |  |  | 672,000 |  |  |  |
Business acquisition, contract termination and other expenses |  |  |  |  |  |  |  | 1,900,000 |  |  |  |
Revenue from the operations of Bay Bank included in TNB's operations results |  |  |  |  |  |  |  |  | 10,000,000 |  |  |
Net income available to common shareholders | $ 29,904,000 | $ 26,968,000 | $ 89,573,000 | $ 82,583,000 |  |  |  |  | $ 1,200,000 |  |  |

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- Definition The amount of FDIC indemnification assets acquired in a business acquisition. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to other assets of the acquired entity, except for property plant and equipment, intangible assets, and goodwill. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity, net of tax expense. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of tax expense on the gross gain recognized by the entity. + References No definition available. + Details
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- Definition The cash inflow received from FDIC associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References No definition available. + Details
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- Definition Term in years covered by the loss share agreement, from the date the loss share agreement was entered, for FDIC loss sharing and the acquirer's reimbursements to the FDIC for recoveries of covered losses for single family residential mortgage loans and related foreclosed real estate. + References No definition available. + Details
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- Definition Term in number of years covered by the loss share agreement, from the date the loss share agreement was entered, for FDIC loss sharing and the acquirer's reimbursements to the FDIC for recoveries of covered losses for commercial loans and related foreclosed real estate. + References No definition available. + Details
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- Definition Percentage of covered assets the FDIC will reimburse on losses incurred by the acquirer under a loss share agreement. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable in a proposed business acquisition. + References No definition available. + Details
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- Definition The number of offices owned by the business to be acquired by the entity. + References No definition available. + Details
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- Definition Additional number of years after the loss sharing and reimbursement to the FDIC for recoveries of covered losses the acquirer reimburses the FDIC for recoveries of covered losses. + References No definition available. + Details
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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) -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 total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 Emerging Issues Task Force (EITF) -Number 99-12 -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 amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 52 -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 amount of acquisition cost of a business combination allocated to assets acquired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -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 total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 35 -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 amount of acquisition cost of a business combination allocated to marketable securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -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. + Details
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- Definition The amount of acquisition cost of a business combination allocated to other current liabilities of the acquired entity. Does not include amounts allocated to the current portion of long-term debt, accounts payable and accrued expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 amount of acquisition cost of a business combination allocated to liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -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 Emerging Issues Task Force (EITF) -Number 98-1 -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 amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph d -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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