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Bank segment - Other borrowings (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
FHLB advances |  | $ 0
Federal funds purchased | $ 50,000,000.0 | 0
Gross amount of recognized liabilities | 81,000,000 | 115,000,000
Gross amount offset in the Balance Sheets | 0 | 0
Securities sold under agreements to repurchase | 81,000,000 | 115,000,000
Commercial account holders |  |
Offsetting Liabilities [Line Items] |  |
Securities sold under agreements to repurchase | 81,000,000 | 115,000,000
Securities sold under agreements to repurchase collateral, financial instruments | 105,000,000 | 130,000,000
Securities sold under agreements to repurchase, cash collateral pledged | 0 | 0
American Savings Bank (ASB) |  |
Offsetting Liabilities [Line Items] |  |
FHLB advances | 27,000,000.0 |
Securities sold under agreements to repurchase | $ 80,600,000 | $ 115,000,000

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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