Significant accounting policies (Policies)	6 Months Ended
Jun. 30, 2015
Accounting Policies [Abstract]
Prior year changes in the presentation of consolidated statements of cash flows	Prior year changes in the presentation of condensed consolidated statements of cash flows The Company had previously excluded income attributable to non-controlling interests from cash flows provided by operating activities and included these amounts in cash flows used in investing activities and provided by financing activities. The Company began including income from non-controlling interests in cash flows provided by operating activities for the year ended December 31, 2014. In addition, cash flows related to the non-controlling interest in investment affiliate were previously included in net cash used in investing activities and is now being included in net cash provided by financing activities. Lastly, the Company now includes interest expense on deposit liabilities and the change in fair value of embedded derivatives in deposit liability contracts as non-cash adjustments in operating activities. These changes did not impact the condensed consolidated balance sheets or condensed consolidated statements of income for the prior periods. The Company modified the presentation of its condensed consolidated statement of cash flows for the six months ended June 30, 2014 to conform to the current year presentation.
Recently issued accounting standards	Recently issued accounting standards Issued and effective as of June 30, 2015 In April 2014, the FASB issued Accounting Standards Update 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (ASU 2014-08). ASU 2014-08 changes the requirements for reporting discontinued operations, such that a disposal of a component of the Company’s operations is required to be reported as discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on the Company’s operations and financial results. ASU 2014-08 is effective for all disposals that occur after January 1, 2015, with early adoption permitted. This new pronouncement did not have a material impact on the Company’s condensed consolidated financial statements. Issued but not yet effective as of June 30, 2015 In February 2015, the FASB issued Accounting Standard Update 2015-02, Consolidation (Topic 810) Amendments to the Consolidation Analysis (ASU 2015-02). ASU 2015-02 requires management to evaluate whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities. ASU 2015-02 eliminates the presumption that a general partner should consolidate a limited partnership and affects the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships. ASU 2015-02 also provides a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in ASU 2015-02 are effective for interim and annual periods beginning after December 15, 2015. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on the Company’s condensed consolidated financial statements. In April 2015, the FASB issued Accounting Standards Update 2015-03, Interest - Imputation of Interest (ASU 2015-03). ASU 2015-03 simplifies the presentation of debt issuance costs and requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by ASU 2015-03. The amendments in ASU 2015-03 are effective for financial statements issued for fiscal years beginning after December 31, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU 2015-03 effective with its debt issuance in February 2015. In May 2015, the FASB issued Accounting Standards Update 2015-07, Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (ASU 2015-07). ASU 2015-07 will eliminate the requirement to categorize certain investments in the fair value hierarchy if their fair value is measured at net asset value (NAV) per share (or its equivalent) using the practical expedient in the FASB’s fair value measurement guidance. The amendments in ASU 2015-07 are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on the Company’s condensed consolidated financial statements. In May 2015, the FASB issued Accounting Standards Update 2015-09, Disclosures about Short-Duration Contracts (ASU 2015-09). ASU 2015-09 amends ASC 944 (Financial Services - Insurance) to expand the disclosures that an insurance entity must provide about its short-duration insurance contracts. Under ASU 2015-09, the FASB focused on targeted improvements to provide users with additional information about insurance liabilities, including the nature, amount, timing, and uncertainty of future cash flows related to insurance liabilities. The amendments in ASU 2015-09 are effective for annual periods beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on the Company’s condensed consolidated financial statements. In June 2015, the FASB issued Accounting Standards Update 2015-10, Technical Corrections and Improvements (ASU 2015-10). ASU 2015-10 amends a number of Topics in the FASB Accounting Standards Codification and is part of an ongoing project on the FASB’s agenda to facilitate Codification updates for non-substantive technical corrections, clarifications and improvements that are not expected to have a significant effect on accounting practice or create a significant administrative cost to most entities. The amendments in ASU 2015-10 are effective for annual periods beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on the Company’s condensed consolidated financial statements.

Recently issued accounting standards

Issued and effective as of June 30, 2015

In April 2014, the FASB issued Accounting Standards Update 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (ASU 2014-08). ASU 2014-08 changes the requirements for reporting discontinued operations, such that a disposal of a component of the Company’s operations is required to be reported as discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on the Company’s operations and financial results. ASU 2014-08 is effective for all disposals that occur after January 1, 2015, with early adoption permitted. This new pronouncement did not have a material impact on the Company’s condensed consolidated financial statements.

Issued but not yet effective as of June 30, 2015

In February 2015, the FASB issued Accounting Standard Update 2015-02, Consolidation (Topic 810) Amendments to the Consolidation Analysis (ASU 2015-02). ASU 2015-02 requires management to evaluate whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities. ASU 2015-02 eliminates the presumption that a general partner should consolidate a limited partnership and affects the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships. ASU 2015-02 also provides a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in ASU 2015-02 are effective for interim and annual periods beginning after December 15, 2015. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on the Company’s condensed consolidated financial statements.

In April 2015, the FASB issued Accounting Standards Update 2015-03, Interest - Imputation of Interest (ASU 2015-03). ASU 2015-03 simplifies the presentation of debt issuance costs and requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by ASU 2015-03. The amendments in ASU 2015-03 are effective for financial statements issued for fiscal years beginning after December 31, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU 2015-03 effective with its debt issuance in February 2015.

In May 2015, the FASB issued Accounting Standards Update 2015-07, Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (ASU 2015-07). ASU 2015-07 will eliminate the requirement to categorize certain investments in the fair value hierarchy if their fair value is measured at net asset value (NAV) per share (or its equivalent) using the practical expedient in the FASB’s fair value measurement guidance. The amendments in ASU 2015-07 are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on the Company’s condensed consolidated financial statements.

In May 2015, the FASB issued Accounting Standards Update 2015-09, Disclosures about Short-Duration Contracts (ASU 2015-09). ASU 2015-09 amends ASC 944 (Financial Services - Insurance) to expand the disclosures that an insurance entity must provide about its short-duration insurance contracts. Under ASU 2015-09, the FASB focused on targeted improvements to provide users with additional information about insurance liabilities, including the nature, amount, timing, and uncertainty of future cash flows related to insurance liabilities. The amendments in ASU 2015-09 are effective for annual periods beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on the Company’s condensed consolidated financial statements.

In June 2015, the FASB issued Accounting Standards Update 2015-10, Technical Corrections and Improvements (ASU 2015-10). ASU 2015-10 amends a number of Topics in the FASB Accounting Standards Codification and is part of an ongoing project on the FASB’s agenda to facilitate Codification updates for non-substantive technical corrections, clarifications and improvements that are not expected to have a significant effect on accounting practice or create a significant administrative cost to most entities. The amendments in ASU 2015-10 are effective for annual periods beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on the Company’s condensed consolidated financial statements.