Short-term Borrowings/Other Borrowings (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Short-term debt outstanding	$ 0	$ 0
Federal Reserve Bank of San Francisco
Short-term Debt [Line Items]
Unused borrowing lines	297,519,000	302,456,000
Qualifying loans pledged as collateral for borrowing lines	427,940,000	444,596,000
Federal Home Loan Bank (FHLB)
Short-term Debt [Line Items]
Unused borrowing lines	2,443,000	2,854,000
Investment securities pledged as collateral	2,583,000	3,023,000
Pacific Coast Bankers Bank
Short-term Debt [Line Items]
Unused borrowing lines	10,000,000	$ 10,000,000
Zions First National Bank
Short-term Debt [Line Items]
Unused borrowing lines	$ 20,000,000