Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended					7 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Apr. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 4,329	$ 916	$ 4,369	$ 4,642	$ 2,306		$ 9,092	$ 10,592
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	1,100			0			5,250	0
Provision for unfunded commitments							105	0
Provision for depreciation and amortization							894	1,055
Amortization of core deposit intangible							574	529
Amortization of debt issuance costs							36	36
Compensation expense associated with restricted stock							334	306
Tax benefits from vesting of restricted stock							(2)	(6)
Net gain on sale or call of securities	(258)			(12)			(482)	(137)
Amortization of premiums and accretion of discounts on investments, net							1,056	1,052
Amortization of premiums and accretion of discounts on acquired loans, net							(1,104)	(1,201)
Loss on disposal of fixed assets							132	0
Loss (gain) on sale of OREO	0			0			23	(41)
Increase in cash surrender value of life insurance							(396)	(410)
Deferred compensation and salary continuation plan payments							(633)	(1,072)
Increase in deferred compensation and salary continuation plans							634	731
Increase (decrease) in deferred loan fees and costs							3,199	(53)
(Increase) decrease in other assets							(1,759)	1,516
Increase in other liabilities							1,369	513
Net cash provided by operating activities							18,322	13,410
Cash flows from investing activities:
Proceeds from maturities of and payments on available-for-sale securities							61,114	47,544
Proceeds from sale of available-for-sale securities							56,017	99,635
Purchases of available-for-sale securities							(160,759)	(48,648)
Investment in qualified affordable housing partnerships							(13)	0
Net purchase of Federal Home Loan Bank of San Francisco stock							0	(34)
Loan originations, net of principal repayments							(186,305)	(27,697)
Net repayment on loan pools							13,631	27,265
Purchase of premises and equipment							(353)	(1,823)
Proceeds from the sale of OREO							12	87
Acquisition of Merchants Holding Company, net of cash paid							0	(2,875)
Net cash (used) provided by investing activities							(216,656)	93,454
Cash flows from financing activities:
Net increase (decrease) in demand, money market and savings deposits							261,846	(25,029)
Net decrease in certificates of deposit							(10,886)	(34,764)
Advances on term debt							50,000	180,160
Repayment of term debt							(40,000)	(183,656)
Proceeds from stock options exercised							0	40
Repurchase of common stock						$ (13,600)	(12,653)	0
Cash paid for shares surrendered for tax-withholding purposes							(120)	(94)
Cash dividends paid on common stock							(2,574)	(2,282)
Net cash provided (used) by financing activities							245,613	(65,625)
Net increase in cash and cash equivalents							47,279	41,239
Cash and cash equivalents at beginning of year		$ 80,604	88,604		47,365	$ 88,604	80,604	47,365	$ 47,365
Cash and cash equivalents at end of period	127,883		$ 80,604	88,604			127,883	88,604	$ 80,604
Cash paid during the period for:
Income taxes							2,398	3,480
Interest							3,509	4,336
Operating leases	234			229			714	661
Supplemental disclosures of non-cash investing activities:
Transfer of loans to other real estate owned							8	74
Investment in qualified affordable housing partnership							1,000	0
Unrealized gain on investment securities available-for-sale, net of gains included in net income							6,705	7,588
Changes in net deferred tax asset related to changes in net unrealized gain on investment securities available-for-sale							(1,982)	(2,243)
Changes in accumulated other comprehensive income due to net unrealized gain on investment securities available-for-sale							4,723	5,345
Supplemental disclosures of non-cash financing activities:
Stock compensation grants					$ 58		0	58
Cash dividend declared on common shares and payable after period-end	$ 833			$ 905			833	905
Right-of-use lease asset recorded on new leases							0	267
Right-of-use lease asset recorded on adoption of ASU No. 2016-02							0	3,998
Lease liability recorded on adoption of ASU No. 2016-02							0	4,363
Disclosures related to the acquisition of Merchants Holding Company:
Consideration paid							0	34,907
Assets acquired - fair value							0	215,055
Goodwill							0	11,006
Liabilities assumed - fair value							$ 0	$ 191,154