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Business Combinations Business Combinations (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2015 | Oct. 02, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Feb. 13, 2015 | Oct. 01, 2014 | Jan. 01, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill Impairment Prior To Acquisition |  | $ 166,800,000 |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value |  |  |  |  |  |  | $ 154,496,000 |  | $ 316,327,000
Gain on acquisition |  |  | $ 0 | $ 0 | $ 42,930,000 | $ 0 |  |  |
Merger-related expenses |  |  | 3,679,000 | $ 1,505,000 | 11,249,000 | $ 7,352,000 |  |  |
Bancorporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
BancShares number of shares owned in Bancorporation |  | 32,042 |  |  |  |  |  |  |
Fair value of Bancorporation shares owned by BancShares |  |  |  |  |  |  |  | $ 29,551,000 |
Cash and overnight investments |  |  |  |  |  |  |  | 1,280,000,000 |
Investment securities available for sale |  |  |  |  |  |  |  | 2,011,263,000 |
Loans |  |  |  |  |  |  |  | 4,491,067,000 |
Intangible asset |  |  |  |  |  |  |  | 109,416,000 |
Total assets acquired |  |  |  |  |  |  |  | 8,275,367,000 |
Deposits |  |  |  |  |  |  |  | 7,174,817,000 |
Total liabilities assumed |  |  |  |  |  |  |  | 7,655,408,000 |
Cash paid to shareholders |  | $ 30,394,000 |  |  |  |  |  |  |
Goodwill acquired |  | $ 4,233,000 |  |  |  |  |  |  |
Pro forma revenue |  |  | 341,927,000 |  | 995,704,000 |  |  |  |
Pro forma net income |  |  | (127,768,000) |  | (50,279,000) |  |  |  |
Capitol City Bank and Trust |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | 19,622,000 |  |
Investment securities available for sale |  |  |  |  |  |  | 35,413,000 |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value |  |  |  |  |  |  | 154,496,000 |  |
Intangible asset |  |  |  |  |  |  | 690,000 |  |
Other assets |  |  |  |  |  |  | 1,714,000 |  |
Total assets acquired |  |  |  |  |  |  | 211,935,000 |  |
Deposits |  |  |  |  |  |  | 266,352,000 |  |
Business Combination Bargain Purchase Gain Adjustment |  |  | 5,400,000 |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  | 5,501,000 |  |
Other liabilities |  |  |  |  |  |  | 667,000 |  |
Total liabilities assumed |  |  |  |  |  |  | 272,520,000 |  |
Fair value of net assets (liabilities) assumed |  |  |  |  |  |  | (60,585,000) |  |
Cash received from FDIC |  |  |  |  |  |  | $ 103,515,000 |  |
Gain on acquisition | $ 42,930,000 |  |  |  |  |  |  |  |
Bargain Purchase After Tax Gain | $ 26,400,000 |  |  |  |  |  |  |  |
Merger-related expenses |  |  | 500,000 |  | 1,800,000 |  |  |  |
Revenue generated |  |  | $ 2,300,000 |  | $ 6,000,000 |  |  |  |
Class A Common Stock | Bancorporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 2,586,762 |  |  |  |  |  |  |
Value of shares of BancShares common stock issued to Bancorporation |  |  |  |  |  |  |  | 560,370,000 |
Class B Common Stock | Bancorporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 18,202 |  |  |  |  |  |  |
Value of shares of BancShares common stock issued to Bancorporation |  |  |  |  |  |  |  | $ 3,877,000 |
Shares and Cash | Bancorporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Right to receive cash per share |  | $ 50.00 |  |  |  |  |  |  |
Shares and Cash | Class A Common Stock | Bancorporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 4.00 |  |  |  |  |  |  |
Shares Only | Class A Common Stock | Bancorporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 3.58 |  |  |  |  |  |  |
Shares Only | Class B Common Stock | Bancorporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 0.42 |  |  |  |  |  |  |

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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