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Fair value measurements - Assets and liabilities measured on a recurring basis (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
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Fair value measurements on a recurring basis |  |  |
Available-for-sale investment securities | $ 894,021,000 | $ 820,648,000 |
Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Money market funds | 10,000 | 10,000 |
Available-for-sale investment securities | 894,021,000 | 820,648,000 |
Derivative assets |  |  |
Derivative assets | 1,219,000 | 385,000 |
Derivative liabilities |  |  |
Derivative liabilities | 270,000 | 30,000 |
Loans | 4,940,177,000 | 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 | 211,000 | 15,000 |
Level 2 | Estimated fair value |  |  |
Fair value measurements on a recurring basis |  |  |
Money market funds | 10,000 | 10,000 |
Available-for-sale investment securities | 894,021,000 | 820,648,000 |
Derivative assets |  |  |
Derivative assets | 1,219,000 | 385,000 |
Derivative liabilities |  |  |
Derivative liabilities | 59,000 | 15,000 |
Loans | 6,242,000 | 4,639,000 |
Level 3 | Estimated fair value |  |  |
Derivative liabilities |  |  |
Loans | 4,933,935,000 | 4,744,886,000 |
Fair value measurements on a recurring basis | Level 1 |  |  |
Derivative assets |  |  |
Derivative assets | 0 | 0 |
Derivative liabilities |  |  |
Derivative liabilities | 211,000 | 15,000 |
Fair value measurements on a recurring basis | Level 1 | Forward sale contracts |  |  |
Derivative assets |  |  |
Derivative assets | 0 | 0 |
Derivative liabilities |  |  |
Derivative liabilities | 211,000 | 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 | 1,219,000 | 385,000 |
Derivative liabilities |  |  |
Derivative liabilities | 59,000 | 15,000 |
Fair value measurements on a recurring basis | Level 2 | Interest rate lock commitments |  |  |
Derivative assets |  |  |
Derivative assets | 795,000 | 384,000 |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair value measurements on a recurring basis | Level 2 | Forward sale contracts |  |  |
Derivative assets |  |  |
Derivative assets | 4,000 | 1,000 |
Derivative liabilities |  |  |
Derivative liabilities | 59,000 | 15,000 |
Fair value measurements on a recurring basis | Level 2 | Window forward contract |  |  |
Derivative assets |  |  |
Derivative assets | 420,000 | 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 investment securities | 894,021,000 | 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 investment securities | 695,862,000 | 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 investment securities | 198,159,000 | 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 | 313,000 | 178,000 |
Real estate acquired in settlement of loans | 446,000 | 1,030,000 |
Fair value measurements on a nonrecurring basis | Level 3 |  |  |
Derivative liabilities |  |  |
Loans | 313,000 | 178,000 |
Real estate acquired in settlement of loans | $ 446,000 | $ 1,030,000 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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