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Cash and Cash Equivalents	6 Months Ended
Cash and Cash Equivalents	Jun. 30, 2018
Cash and Due from Banks [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents The Company is required to maintain a $761,000 minimum average daily balance with the Federal Reserve Bank of San Francisco ("Federal Reserve Bank") for purposes of settling financial transactions and charges for Federal Reserve Bank services. The Company is also required to maintain cash balances or deposits with the Federal Reserve Bank sufficient to meet its statutory reserve requirements. The Company is required to maintain a $500,000 balance with a correspondent bank for outsourced servicing of ATMs. The Company is required to maintain a $100,000 and $300,000 balance with a correspondent bank to collateralize the initial margin and the fair value exposure of its interest rate swap, respectively.