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Fair value measurements - Assets and liabilities measured on a recurring basis (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Fair value measurements on a recurring basis
Available-for-sale securities	$ 906,295,000	$ 820,648,000
Estimated fair value
Fair value measurements on a recurring basis
Money market funds	10,000	10,000
Available-for-sale securities	906,295,000	820,648,000
Derivative assets
Derivative assets	2,295,000	385,000
Derivative liabilities
Derivative liabilities	192,000	30,000
Loans	4,845,115,000	4,749,525,000
Level 1 | Interest rate lock commitments
Derivative liabilities
Derivative liabilities	0	0
Level 1 | Estimated fair value
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	139,000	15,000
Level 2 | Estimated fair value
Fair value measurements on a recurring basis
Money market funds	10,000	10,000
Available-for-sale securities	906,295,000	820,648,000
Derivative assets
Derivative assets	2,295,000	385,000
Derivative liabilities
Derivative liabilities	53,000	15,000
Loans	7,938,000	4,639,000
Level 3 | Estimated fair value
Derivative liabilities
Loans	4,837,177,000	4,744,886,000
Fair value measurements on a recurring basis | Level 1
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	139,000	15,000
Fair value measurements on a recurring basis | Level 1 | Forward sale contracts
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	139,000	15,000
Fair value measurements on a recurring basis | Level 1 | Window forward contract
Derivative assets
Derivative assets	0	0
Fair value measurements on a recurring basis | Level 2
Derivative assets
Derivative assets	2,295,000	385,000
Derivative liabilities
Derivative liabilities	53,000	15,000
Fair value measurements on a recurring basis | Level 2 | Interest rate lock commitments
Derivative assets
Derivative assets	655,000	384,000
Derivative liabilities
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 2 | Forward sale contracts
Derivative assets
Derivative assets	0	1,000
Derivative liabilities
Derivative liabilities	53,000	15,000
Fair value measurements on a recurring basis | Level 2 | Window forward contract
Derivative assets
Derivative assets	1,640,000	0
Fair value measurements on a recurring basis | Level 2 | Other
Fair value measurements on a recurring basis
Money market funds	10,000	10,000
Fair value measurements on a recurring basis | Level 2 | Bank
Fair value measurements on a recurring basis
Available-for-sale securities	906,295,000	820,648,000
Fair value measurements on a recurring basis | Level 2 | Mortgage-related securities - FNMA, FHLMC and GNMA | Bank
Fair value measurements on a recurring basis
Available-for-sale securities	687,598,000	607,689,000
Fair value measurements on a recurring basis | Level 2 | U.S. Treasury federal agency obligations | Bank
Fair value measurements on a recurring basis
Available-for-sale securities	218,697,000	212,959,000
Fair value measurements on a nonrecurring basis | American Savings Bank (ASB)
Derivative liabilities
Adjustments to fair value of loans held for sale	0	0
Fair value measurements on a nonrecurring basis | Estimated fair value
Derivative liabilities
Loans	82,000	178,000
Real estate acquired in settlement of loans	797,000	1,030,000
Fair value measurements on a nonrecurring basis | Level 3
Derivative liabilities
Loans	82,000	178,000
Real estate acquired in settlement of loans	$ 797,000	$ 1,030,000

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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.

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