Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Interest income:
Interest and fees on loans		$ 10,729	$ 9,384
Interest on taxable securities		1,209	789
Interest on tax-exempt securities		463	530
Interest on interest-bearing deposits in other banks		129	114
Total interest income		12,530	10,817
Interest expense:
Interest on demand deposits		221	148
Interest on savings deposits		59	47
Interest on certificates of deposit		495	529
Interest on Federal Home Loan Bank of San Francisco borrowings		47
Interest other borrowings		281	293
Interest on junior subordinated debentures		82	66
Total interest expense		1,185	1,083
Net interest income		11,345	9,734
Provision for loan and lease losses			200
Net interest income after provision for loan and lease losses		11,345	9,534
Noninterest income:
Fees on payroll and benefit processing		169	191
Life insurance		129	646
Gain on sale of investment securities, net		36	66
Federal Home Loan Bank of San Francisco dividends		80	103
Gain (loss) on sale of OREO		16	(71)
Other income		110	143
Total noninterest income		982	1,471
Noninterest expense:
Salaries and related benefits		4,855	4,858
Premises and equipment		1,071	1,048
Federal Deposit Insurance Corporation insurance premium		96	48
Data processing fees		432	406
Professional service fees		345	384
Telecommunications		216	211
Other expenses		1,018	1,035
Total noninterest expense		8,033	7,990
Income before provision for income taxes		4,294	3,015
Provision for income taxes		1,053	763
Net income		$ 3,241	$ 2,252
Earnings per share - basic (in dollars per share)		$ 0.20	$ 0.17
Weighted average shares - basic (in shares)	[1]	16,225	13,416
Earnings per share - diluted (in dollars per share)		$ 0.20	$ 0.17
Weighted average shares - diluted (in shares)		16,310	13,521
Deposit Account [Member]
Noninterest income:
Revenue from Contract with Customer		$ 176	$ 127
Credit and Debit Card [Member]
Noninterest income:
Revenue from Contract with Customer		$ 266	$ 266

[1] Excludes unvested restricted shares because they do not have dividend or voting rights