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Fair value measurements (Details 3) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Mortgage-related securities - FNMA, FHLMC and GNMA | Dec. 31, 2013 Mortgage-related securities - FNMA, FHLMC and GNMA | Mar. 31, 2014 Federal agency obligations | Dec. 31, 2013 Federal agency obligations | Mar. 31, 2014 Municipal bonds | Dec. 31, 2013 Municipal bonds | Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 | Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 | Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Interest rate lock commitments | Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Interest rate lock commitments | Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Forward sale contracts | Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Forward sale contracts | Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Bank | Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Bank | Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Other | Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Other | Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Mortgage-related securities - FNMA, FHLMC and GNMA Bank | Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Mortgage-related securities - FNMA, FHLMC and GNMA Bank | Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Federal agency obligations Bank | Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Federal agency obligations Bank | Mar. 31, 2014 Fair value measurements on a recurring basis Level 2 Municipal bonds Bank | Dec. 31, 2013 Fair value measurements on a recurring basis Level 2 Municipal bonds Bank | Mar. 31, 2014 Fair value measurements on a recurring basis Level 1 | Dec. 31, 2013 Fair value measurements on a recurring basis Level 1 | Mar. 31, 2014 Fair value measurements on a recurring basis Level 1 Forward sale contracts | Dec. 31, 2013 Fair value measurements on a recurring basis Level 1 Forward sale contracts | Mar. 31, 2014 Fair value measurements on a nonrecurring basis American Savings Bank (ASB) | Mar. 31, 2013 Fair value measurements on a nonrecurring basis American Savings Bank (ASB) | Mar. 31, 2014 Fair value measurements on a nonrecurring basis Estimated fair value | Dec. 31, 2013 Fair value measurements on a nonrecurring basis Estimated fair value | Mar. 31, 2014 Fair value measurements on a nonrecurring basis Level 3 | Dec. 31, 2013 Fair value measurements on a nonrecurring basis Level 3
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Fair value measurements on a recurring and nonrecurring basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities | 517,534,000 | 529,007,000 | 431,014,000 | 369,444,000 | 86,520,000 | 80,973,000 | 0 | 78,590,000 |  |  |  |  |  |  | 517,534,000 | 529,007,000 |  |  | 431,014,000 | 369,444,000 | 86,520,000 | 80,973,000 | 0 | 78,590,000 |  |  |  |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  |  |  | 212,000 | 531,000 | 199,000 | 488,000 | 13,000 | 43,000 |  |  |  |  |  |  |  |  |  |  | 22,000 | 98,000 | 22,000 | 98,000 |  |  |  |  |  |
Derivative liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities |  |  |  |  |  |  |  |  | 7,000 | 26,000 | 5,000 | 24,000 | 2,000 | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 4,000,000 | 5,000,000 | 4,000,000
Adjustments to fair value of loans held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: 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 3: 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=28364263&loc=d3e13495-108611 Reference 4: 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=20225523&loc=SL20225862-175312 Reference 5: 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 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=28370219&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: 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 3: 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=28364263&loc=d3e13495-108611 Reference 4: 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=20225523&loc=SL20225862-175312 Reference 5: 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 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=28370219&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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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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