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Borrowing Arrangements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Borrowing Arrangements |  |
Investments securing FHLB advances, amortized cost | $ 426,092 |
Available-for-sale investment securities | 430,260 | $ 432,535
San Fransisco Branch |  |
Borrowing Arrangements |  |
Advances from FHLB | 0 |
Federal Home Loan Bank Advances [Member] | Securities Pledged as Collateral |  |
Borrowing Arrangements |  |
Investments securing FHLB advances, amortized cost | 864 | 1,256
Estimated Fair Value | $ 958 | $ 1,364

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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