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Business Combinations Businss Combinations (Details) - USD ($) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 14, 2015 | Oct. 02, 2014 | Jan. 02, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 13, 2015 | Oct. 01, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value |  |  |  | $ 154,496,000 | $ 623,408,000 |  | $ 154,496,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value |  |  |  |  |  |  |  | $ 4,175,586,000
FDIC Indemnification Asset, Acquisitions |  |  |  | 0 | 5,106,000 | $ 0 |  |
Gain on acquisition |  |  |  | 42,930,000 | 0 | 0 |  |
Merger-related expenses |  |  |  | 14,174,000 | 13,064,000 | $ 391,000 |  |
Capitol City Bank and Trust |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash and due from banks |  |  |  |  |  |  | 19,622,000 |
Investment securities |  |  |  |  |  |  | 35,413,000 |
Other intangible assets |  |  |  |  |  |  | 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 |  |  |  |
Gain on acquisition | $ 42,930,000 |  |  |  |  |  |  |
Bargain Purchase After Tax Gain | $ 26,400,000 |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  | 5,501,000 |
Other liabilities |  |  |  |  |  |  | 667,000 |
Total liabilities assumed |  |  |  |  |  |  | 272,520,000 |
Fair value of net assets (liabilities) acquired |  |  |  |  |  |  | (60,585,000) |
Business Combination Cash Received From FDIC In Acquisition |  |  |  |  |  |  | $ 103,515,000 |
Revenue of acquired business |  |  |  | 8,300,000 |  |  |  |
Merger-related expenses |  |  |  | 1,900,000 |  |  |  |
Bancorporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
BancShares number of shares owned in Bancorporation |  | 32,042 |  |  |  |  |  |
Gain on Bancorporation stock |  | $ 29,100,000 |  |  |  |  |  |
Cash paid to shareholders |  | 30,394,000 |  |  |  |  |  |
Fair value of Bancorporation shares owned by BancShares |  |  |  |  |  |  |  | 29,551,000
Total purchase price |  | 624,192,000 |  |  |  |  |  |
Cash and due from banks |  |  |  |  |  |  |  | 194,570,000
Overnight investments |  |  |  |  |  |  |  | 1,087,325,000
Investment securities |  |  |  |  |  |  |  | 2,011,263,000
Loans held for sale |  |  |  |  |  |  |  | 30,997,000
Loans and leases |  |  |  |  |  |  |  | 4,491,067,000
Premises and equipment |  |  |  |  |  |  |  | 238,646,000
Other real estate owned |  |  |  |  |  |  |  | 35,344,000
Income earned not collected |  |  |  |  |  |  |  | 15,266,000
FDIC loss share receivable |  |  |  |  |  |  |  | 5,106,000
Other intangible assets |  |  |  |  |  |  |  | 109,416,000
Other assets |  |  |  |  |  |  |  | 56,367,000
Total assets acquired |  |  |  |  |  |  |  | 8,275,367,000
Deposits |  |  |  |  |  |  |  | 7,174,817,000
Short-term borrowings |  |  |  |  |  |  |  | 295,681,000
Long-term obligations |  |  |  |  |  |  |  | 124,852,000
FDIC loss share payable |  |  |  |  |  |  |  | 224,000
Other liabilities |  |  |  |  |  |  |  | 59,834,000
Total liabilities assumed |  |  |  |  |  |  |  | 7,655,408,000
Fair value of net assets (liabilities) acquired |  |  |  |  |  |  |  | 619,959,000
Goodwill acquired |  | 4,233,000 |  | 0 | 4,233,000 |  |  |
Revenue of acquired business |  |  |  | 92,800,000 |  |  |  |
Net income of acquired business |  |  |  | 12,700,000 |  |  |  |
Merger-related expenses |  |  |  | 12,300,000 | 8,000,000 |  |  |
Pro forma revenue |  |  |  | 1,336,340,000 |  |  |  |
Pro forma net income |  |  |  | (13,171,000) |  |  |  |
Goodwill Impairment Prior To Acquisition |  | $ 166,800,000 |  |  |  |  |  |
Bancorporation | Class A Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 2,586,762 |  |  |  |  |  |
Value of shares of BancShares common stock issued to Bancorporation shareholders |  |  |  |  |  |  |  | 560,370,000
Bancorporation | Class B Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 18,202 |  |  |  |  |  |
Value of shares of BancShares common stock issued to Bancorporation shareholders |  |  |  |  |  |  |  | $ 3,877,000
1st Financial |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid to shareholders |  |  | $ 2,000,000 |  |  |  |  |
Cash paid to acquire and retire TARP securities |  |  | 8,000,000 |  |  |  |  |
Total purchase price |  |  | 10,000,000 |  |  |  |  |
Cash and due from banks |  |  | 28,194,000 |  |  |  |  |
Investment securities |  |  | 237,438,000 |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value |  |  | 307,927,000 |  |  |  |  |
Other intangible assets |  |  | 3,780,000 |  |  |  |  |
Total assets acquired |  |  | 612,921,000 |  |  |  |  |
Deposits |  |  | 631,871,000 |  |  |  |  |
Total liabilities assumed |  |  | 635,836,000 |  |  |  |  |
Goodwill acquired |  |  | $ 32,915,000 | 0 | $ 32,915,000 |  |  |
Revenue of acquired business |  |  |  | 15,200,000 |  |  |  |
Merger-related expenses |  |  |  | $ 5,000,000 |  |  |  |
Shares and Cash | Bancorporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Right to receive cash per share |  | $ 50.00 |  |  |  |  |  |
Shares and Cash | Bancorporation | Class A Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 4.00 |  |  |  |  |  |
Shares Only | Bancorporation | Class A Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 3.58 |  |  |  |  |  |
Shares Only | Bancorporation | Class B Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Right to receive number of shares conversion |  | 0.42 |  |  |  |  |  |

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- Definition Income earned not collected acquired through a business combination. + References No definition available. + Details
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- Definition Adjustment made to the bargain purchase gain since initially recorded due to additional information. + References No definition available. + Details
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- Definition Business Combination Cash Received From FDIC In Acquisition + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deposits + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Funds Purchased + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Real Estate Owned + References No definition available. + Details
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- Definition Overnight investments acquired through a business combination. + References No definition available. + 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 Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a 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 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 This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + 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 Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition This element represents the amount of earnings or loss 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 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 intangible assets, excluding goodwill, 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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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: 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 long-term debt due after one year or the normal operating cycle, if longer, 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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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, 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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- Definition Amount of other assets expected to be realized or consumed after 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 The amount of property, plant, and equipment recognized as of 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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