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Fair value measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Mortgage servicing rights | $ 6,260,000 |  |
Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 5,591,422,000 | $ 5,157,537,000 |
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 | 16,806,000 | 12,295,000 |
Estimated fair value | Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 5,574,616,000 | 5,145,242,000 |
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 |  |  |
Mortgage servicing rights | 0 |  |
Loans, net |  | 0 |
Fair value measurements on a nonrecurring basis | Level 2 |  |  |
Fair value measurements on a recurring basis |  |  |
Mortgage servicing rights | 0 |  |
Loans, net |  | 0 |
Fair value measurements on a nonrecurring basis | Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Mortgage servicing rights | 6,260,000 |  |
Loans, net |  | 25,000 |
Fair value measurements on a nonrecurring basis | Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Mortgage servicing rights | $ 6,260,000 |  |
Loans, net |  | $ 25,000 |

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- Definition Represents the amount of fair value adjustments in loans held for sale. + References No definition available. + Details
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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 Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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