Federal Home Loan Bank Advances and Other Borrowings (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate [Abstract]
2019	$ 10,000,000
2020	10,000,000
2021	0
2022	10,000,000
2023 and Thereafter	0
Total	30,000,000
Variable Rate
2019	0
2020	0
2021	0
2022	0
2023 and Thereafter	0
Total	0
2019	10,000,000
2020	10,000,000
2021	0
2022	10,000,000
2023	0
Advances from Federal Home Loan Banks	$ 30,000,000	$ 40,000,000	$ 0
Federal Home Loan Bank, Advances, Activity for Year [Abstract]
Weighted-average interest rate at end of year	1.81%	1.71%	0.00%
Average interest rate during the year	1.75%	1.71%	0.42%
Average balance	$ 34,904,000	$ 20,384,000	$ 1,194,000
Maximum amount outstanding at any month-end	40,000,000	40,000,000	$ 0
Loans pledged to secure borrowings	523,400,000	711,800,000
Additional borrowing capacity	386,000,000	311,000,000
FHLB Advances
Federal Home Loan Bank, Advances, Activity for Year [Abstract]
Unused borrowing capacity	45,200,000
Loans pledged as collateral	50,800,000
Borrowings outstanding	0
Overnight federal funds lines, maximum borrowing capacity	60,000,000
FHLB of San Francisco
Federal Home Loan Bank, Advances, Activity for Year [Abstract]
Investment in capital stock of the FHLB	$ 7,300,000	$ 6,400,000
FHLB Advances \| Minimum
Debt Instrument [Line Items]
Maturity term	2 years
FHLB Advances \| Maximum
Debt Instrument [Line Items]
Maturity term	5 years

Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Due Year Five

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Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Year Four

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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The calculated average balance outstanding for the year for all Federal Home Loan Bank advances as of the Balance Sheet date.

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The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

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The calculated weighted average interest rate for Federal Home Loan Bank advances for the period ended as of the Balance Sheet date.

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The maximum balance outstanding at any month end during the period as of the Balance Sheet date.

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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