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Borrowing Arrangements (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Borrowing Arrangements |  |
Investments securing FHLB advances, amortized cost | $ 520,905,000 |
Federal Funds Purchased | 0 | $ 400,000
Federal Home Loan Bank Advances [Member] | Securities Pledged as Collateral |  |
Borrowing Arrangements |  |
Investments securing FHLB advances, amortized cost | 467,000 | 584,000
Estimated Fair Value | 509,000 | 637,000
San Fransisco Branch |  |
Borrowing Arrangements |  |
Advances from FHLB | $ 0 | $ 0

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- Definition Amount of debt 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=75030427&loc=d3e22054-111558 Reference 2: 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=82896770&loc=d3e26610-111562 Reference 3: 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=82897076&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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