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Fair value measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | $ 5,038,775,000 | $ 4,802,053,000 |
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 | 9,233,000 | 1,809,000 |
Estimated fair value | Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 5,029,542,000 | 4,800,244,000 |
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 |
Real estate acquired in settlement of loans |  | 0 |
Fair value measurements on a nonrecurring basis | Level 2 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 0 | 0 |
Real estate acquired in settlement of loans |  | 0 |
Fair value measurements on a nonrecurring basis | Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 224,000 | 77,000 |
Real estate acquired in settlement of loans |  | 186,000 |
Fair value measurements on a nonrecurring basis | Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | $ 224,000 | 77,000 |
Real estate acquired in settlement of loans |  | $ 186,000 |

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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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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522 + Details
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