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Fair value measurements (Details 2) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financial liabilities |  |  |
Short-term borrowings-other than bank | $ 131,341,000 |  | $ 83,693,000
Other bank borrowings | 239,612,000 |  | 195,926,000
Level 2 |  |  |
Financial assets |  |  |
Derivative assets | 558,000 | [1] |
Carrying or notional amount |  |  |
Financial assets |  |  |
Money market funds | 10,000 |  | 10,000
Available-for-sale investment and mortgage-related securities | 535,264,000 |  | 671,358,000
Investment in stock of Federal Home Loan Bank of Seattle | 93,413,000 |  | 96,022,000
Loans receivable, net | 4,010,961,000 |  | 3,763,238,000
Derivative assets | 24,196,000 |  |
Financial liabilities |  |  |
Deposit liabilities | 4,310,842,000 |  | 4,229,916,000
Short-term borrowings-other than bank | 131,341,000 |  | 83,693,000
Other bank borrowings | 239,612,000 |  | 195,926,000
Long-term debt, net-other than bank | 1,422,880,000 |  | 1,422,872,000
Derivative liabilities | 22,185,000 |  |
Carrying or notional amount | American Savings Bank (ASB) |  |  |
Financial liabilities |  |  |
Loan commitments and unused lines and letters of credit | 1,600,000,000 |  | 1,500,000,000
Notional amount of loans serviced | 1,400,000,000 |  | 1,300,000,000
Estimated fair value |  |  |
Financial assets |  |  |
Money market funds | 10,000 |  | 10,000
Available-for-sale investment and mortgage-related securities | 535,264,000 |  | 671,358,000
Investment in stock of Federal Home Loan Bank of Seattle | 93,413,000 |  | 96,022,000
Loans receivable, net | 4,149,137,000 |  | 3,957,752,000
Derivative assets | 558,000 |  |
Financial liabilities |  |  |
Deposit liabilities | 4,313,560,000 |  | 4,235,527,000
Short-term borrowings-other than bank | 131,341,000 |  | 83,693,000
Other bank borrowings | 252,230,000 |  | 212,163,000
Long-term debt, net-other than bank | 1,431,434,000 |  | 1,481,004,000
Derivative liabilities | 275,000 |  |
Estimated fair value | Level 1 |  |  |
Financial assets |  |  |
Derivative assets | 0 |  |
Financial liabilities |  |  |
Derivative liabilities | 202,000 |  |
Estimated fair value | Level 2 |  |  |
Financial assets |  |  |
Money market funds | 10,000 |  | 10,000
Available-for-sale investment and mortgage-related securities | 535,264,000 |  | 671,358,000
Investment in stock of Federal Home Loan Bank of Seattle | 93,413,000 |  | 96,022,000
Derivative assets | 558,000 |  |
Financial liabilities |  |  |
Deposit liabilities | 4,313,560,000 |  | 4,235,527,000
Short-term borrowings-other than bank | 131,341,000 |  | 83,693,000
Other bank borrowings | 252,230,000 |  | 212,163,000
Long-term debt, net-other than bank | 1,431,434,000 |  | 1,481,004,000
Derivative liabilities | 73,000 |  |
Estimated fair value | Level 3 |  |  |
Financial assets |  |  |
Loans receivable, net | 4,149,137,000 |  | 3,957,752,000
Estimated fair value | American Savings Bank (ASB) |  |  |
Financial liabilities |  |  |
Loan commitments and unused lines and letters of credit | 600,000 |  | 1,200,000
Servicing rights on loans | $ 16,600,000 |  | $ 11,900,000
[1] | Derivatives are carried at fair value with changes in value reflected in the balance sheet in other assets or other liabilities and included in mortgage banking income.

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- Definition The fair value of financial commitments, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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- Definition This element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents other bank borrowings as of the balance sheet date, including securities sold under agreements to repurchase and advances from the Federal Home Loan Bank. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + 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=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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