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Bank segment - Troubled debt restructuring - narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Troubled debt restructurings real estate loans |  |
Troubled debt restructurings |  |
Financing receivable modifications minimum, period of payment default of loans determined to be TDRs (in days) | 90 days |
Commitments to lend additional funds to borrows with impaired or modified loans | $ 0 | $ 0
Consumer mortgage loans collateralized by residential real estate property in foreclosure process | $ 4,000,000 | $ 4,300,000
Land loans |  |
Troubled debt restructurings |  |
Period of interest-only monthly payment term loan (in years) | 3 years |
Land loans | Maximum |  |
Troubled debt restructurings |  |
Extension of maturity date (in years) | 5 years |

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- Definition Represents the extension of maturity period of troubled debt under the troubled debt restructuring plan. + References No definition available. + Details
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- Definition Represents the minimum period of payment default of loans determined to be troubled debt restructurings. + References No definition available. + Details
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- Definition Represents the period of interest-only monthly payment term loan under the troubled debt restructuring plan. + References No definition available. + Details
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- Definition Amount of restructured debt contingently payable based on the occurrence of future events or circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6402221&loc=d3e15765-112638 + Details
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