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Borrowing Arrangements (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Borrowing Arrangements |  |
Investments securing FHLB advances, amortized cost | $ 1,045,753,000 |
Available-for-sale debt securities | 1,060,362,000 | $ 710,092,000
Federal funds purchased | 0 | 0
Federal Home Loan Bank Advances |  |
Borrowing Arrangements |  |
Loans Pledged as Collateral | 462,491,000 |
Remaining borrowing capacity | 262,091,000 |
Federal Home Loan Bank Advances | Securities Pledged as Collateral |  |
Borrowing Arrangements |  |
Investments securing FHLB advances, amortized cost | 121,000 | 169,000
Available-for-sale debt securities | 127,000 | $ 178,000
San Fransisco Branch |  |
Borrowing Arrangements |  |
Advances from FHLB | $ 0 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5086-111524 + Details
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