Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Interest income:
Interest and fees on loans		$ 12,031	$ 10,729
Interest on taxable securities		1,764	1,209
Interest on tax-exempt securities		387	463
Interest on interest-bearing deposits in other banks		245	129
Total interest income		14,427	12,530
Interest expense:
Interest on demand - interest-bearing		126	89
Interest on money market		289	132
Interest on savings		111	59
Interest on certificates of deposit		490	495
Interest on Federal Home Loan Bank of San Francisco borrowings		55	47
Interest on other borrowings		239	281
Interest on junior subordinated debentures		113	82
Total interest expense		1,423	1,185
Net interest income		13,004	11,345
Provision for loan and lease losses
Net interest income after provision for loan and lease losses		13,004	11,345
Noninterest income:
Fees on payroll and benefit processing		171	169
Life insurance		129	129
Gain on sale of investment securities, net		92	36
Federal Home Loan Bank of San Francisco dividends		121	80
Gain on sale of OREO		23	16
Other income		87	110
Total noninterest income		1,057	982
Noninterest expense:
Salaries and related benefits		5,729	4,855
Premises and equipment		992	1,071
Federal Deposit Insurance Corporation insurance premium		100	96
Data processing fees		559	432
Professional service fees		303	345
Telecommunications		173	216
Acquisition costs		1,930
Other expenses		1,137	1,018
Total noninterest expense		10,923	8,033
Income before provision for income taxes		3,138	4,294
Provision for income taxes		832	1,053
Net income		$ 2,306	$ 3,241
Earnings per share - basic (in dollars per share)		$ 0.13	$ 0.20
Weighted average shares - basic (in shares)	[1]	17,489	16,225
Earnings per share - diluted (in dollars per share)		$ 0.13	$ 0.20
Weighted average shares - diluted (in shares)		17,552	16,310
Deposit Account [Member]
Noninterest income:
Revenue from Contract with Customer		$ 169	$ 176
Credit and Debit Card [Member]
Noninterest income:
Revenue from Contract with Customer		$ 265	$ 266

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