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Fair value measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Estimated fair value
Fair value measurements on a recurring basis
Loans, net	$ 4,779,329,000	$ 4,781,751,000
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	5,250,000	11,254,000
Estimated fair value | Level 3
Fair value measurements on a recurring basis
Loans, net	4,774,079,000	4,770,497,000
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
Fair value measurements on a nonrecurring basis | Level 2
Fair value measurements on a recurring basis
Loans, net	0	0
Fair value measurements on a nonrecurring basis | Level 3
Fair value measurements on a recurring basis
Loans, net	232,000	2,621,000
Fair value measurements on a nonrecurring basis | Estimated fair value
Fair value measurements on a recurring basis
Loans, net	$ 232,000	$ 2,621,000

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- Definition

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

+ 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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