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Fair value measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | $ 4,779,329,000 | $ 4,781,751,000 |
Estimated fair value | Level 1 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 0 | 0 |
Estimated fair value | Level 2 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 5,250,000 | 11,254,000 |
Estimated fair value | Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 4,774,079,000 | 4,770,497,000 |
Fair value measurements on a nonrecurring basis | American Savings Bank (ASB) |  |  |
Fair value measurements on a recurring basis |  |  |
Adjustments to fair value of loans held for sale | 0 |  | $ 0
Fair value measurements on a nonrecurring basis | Level 1 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 0 | 0 |
Fair value measurements on a nonrecurring basis | Level 2 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 0 | 0 |
Fair value measurements on a nonrecurring basis | Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 232,000 | 2,621,000 |
Fair value measurements on a nonrecurring basis | Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | $ 232,000 | $ 2,621,000 |

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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