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Fair value measurements - Assets measured on a nonrecurring basis (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Estimated fair value
Fair value measurements on a recurring basis
Loans	$ 5,221,758,000		$ 5,439,330,000
Estimated fair value | Level 1
Fair value measurements on a recurring basis
Loans	0		0
Estimated fair value | Level 2
Fair value measurements on a recurring basis
Loans	54,537,000		28,354,000
Estimated fair value | Level 3
Fair value measurements on a recurring basis
Loans	5,167,221,000		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	0		0
Mortgage servicing rights			0
Fair value measurements on a nonrecurring basis | Level 2
Fair value measurements on a recurring basis
Loans	0		0
Mortgage servicing rights			0
Fair value measurements on a nonrecurring basis | Level 3
Fair value measurements on a recurring basis
Loans	125,000		387,000
Mortgage servicing rights			3,001,000
Fair value measurements on a nonrecurring basis | Estimated fair value
Fair value measurements on a recurring basis
Loans	$ 125,000		387,000
Mortgage servicing rights			$ 3,001,000

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- Definition

Represents the amount of fair value adjustments in loans held for sale.

+ References

No definition available.

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+ References

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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

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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)
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