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Fair value measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | $ 5,376,133,000 |  | $ 5,439,330,000
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 | 23,637,000 |  | 28,354,000
Estimated fair value | Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 5,352,496,000 |  | 5,410,976,000
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
Mortgage servicing rights | 0 |  | 0
Fair value measurements on a nonrecurring basis | Level 2 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 0 |  | 0
Mortgage servicing rights | 0 |  | 0
Fair value measurements on a nonrecurring basis | Level 3 |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 69,000 |  | 387,000
Mortgage servicing rights | 61,000 |  | 3,001,000
Fair value measurements on a nonrecurring basis | Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Loans, net | 69,000 |  | 387,000
Mortgage servicing rights | $ 61,000 |  | $ 3,001,000

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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 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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