3. Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowance for loan losses
Beginning balance	$ 6,277	$ 7,167	$ 6,366	$ 7,550
Charge-offs	(259)	(152)	(766)	(481)
Recoveries	167	47	323	180
Provision	110	(218)	372	(405)
Ending balance	6,295	6,844	6,295	6,844
Ending balance: individually evaluated for impairments	1,055	1,146	1,055	1,146
Ending balance: collectively evaluated for impairments	5,240	5,698	5,240	5,698
Ending balance	6,295	6,844	6,295	6,844
Loans
Ending balance	786,724	747,437	786,724	747,437
Ending balance: individually evaluated for impairment	18,799	20,915	18,799	20,915
Ending balance: collectively evaluated for impairment	767,925	726,522	767,925	726,522
Construction and land development
Allowance for loan losses
Beginning balance	668	1,183	804	1,152
Charge-offs	(53)	0	(53)	0
Recoveries	1	2	4	12
Provision	76	(199)	(63)	(178)
Ending balance	692	986	692	986
Ending balance: individually evaluated for impairments	5	0	5	0
Ending balance: collectively evaluated for impairments	687	986	687	986
Ending balance	692	986	692	986
Loans
Ending balance	76,987	75,483	76,987	75,483
Ending balance: individually evaluated for impairment	98	10	98	10
Ending balance: collectively evaluated for impairment	76,889	75,473	76,889	75,473
Single-family residential
Allowance for loan losses
Beginning balance	1,638	1,819	1,812	2,126
Charge-offs	(73)	(20)	(115)	(64)
Recoveries	28	9	55	26
Provision	(134)	69	(293)	(211)
Ending balance	1,459	1,877	1,459	1,877
Ending balance: individually evaluated for impairments	2	0	2	0
Ending balance: collectively evaluated for impairments	1,457	1,877	1,457	1,877
Ending balance	1,459	1,877	1,459	1,877
Loans
Ending balance	249,812	247,184	249,812	247,184
Ending balance: individually evaluated for impairment	2,171	1,875	2,171	1,875
Ending balance: collectively evaluated for impairment	247,641	245,309	247,641	245,309
Single-family residential - Banco de la Gente stated income
Allowance for loan losses
Beginning balance	1,233	1,293	1,280	1,377
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(28)	(17)	(75)	(101)
Ending balance	1,205	1,276	1,205	1,276
Ending balance: individually evaluated for impairments	1,036	1,104	1,036	1,104
Ending balance: collectively evaluated for impairments	169	172	169	172
Ending balance	1,205	1,276	1,205	1,276
Loans
Ending balance	34,742	37,840	34,742	37,840
Ending balance: individually evaluated for impairment	14,557	15,732	14,557	15,732
Ending balance: collectively evaluated for impairment	20,185	22,108	20,185	22,108
Commercial
Allowance for loan losses
Beginning balance	1,420	1,463	1,193	1,593
Charge-offs	0	0	(271)	0
Recoveries	94	4	101	17
Provision	(53)	(49)	438	(192)
Ending balance	1,461	1,418	1,461	1,418
Ending balance: individually evaluated for impairments	12	42	12	42
Ending balance: collectively evaluated for impairments	1,449	1,376	1,449	1,376
Ending balance	1,461	1,418	1,461	1,418
Loans
Ending balance	275,629	245,279	275,629	245,279
Ending balance: individually evaluated for impairment	1,879	3,069	1,879	3,069
Ending balance: collectively evaluated for impairment	273,750	242,210	273,750	242,210
Multifamily and Farmland
Allowance for loan losses
Beginning balance	72	75	72	52
Charge-offs	0	0	(5)	(66)
Recoveries	0	0	1	0
Provision	6	(3)	10	86
Ending balance	78	72	78	72
Ending balance: individually evaluated for impairments	0	0	0	0
Ending balance: collectively evaluated for impairments	78	72	78	72
Ending balance	78	72	78	72
Loans
Ending balance	31,102	28,662	31,102	28,662
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	31,102	28,662	31,102	28,662
Commercial loans (not secured by real estate)
Allowance for loan losses
Beginning balance	587	704	574	675
Charge-offs	(1)	(26)	(4)	(63)
Recoveries	7	8	23	23
Provision	12	(125)	12	(74)
Ending balance	605	561	605	561
Ending balance: individually evaluated for impairments	0	0	0	0
Ending balance: collectively evaluated for impairments	605	561	605	561
Ending balance	605	561	605	561
Loans
Ending balance	97,085	87,019	97,085	87,019
Ending balance: individually evaluated for impairment	94	229	94	229
Ending balance: collectively evaluated for impairment	96,991	86,790	96,991	86,790
Farm loans (not secured by real estate)
Allowance for loan losses
Beginning balance	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	0	0	0	0
Ending balance	0	0	0	0
Ending balance: individually evaluated for impairments	0	0	0	0
Ending balance: collectively evaluated for impairments	0	0	0	0
Ending balance	0	0	0	0
Loans
Ending balance	994	895	994	895
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	994	895	994	895
Consumer And All Other Loans
Allowance for loan losses
Beginning balance	150	158	155	204
Charge-offs	(132)	(106)	(318)	(288)
Recoveries	37	24	139	102
Provision	103	85	182	143
Ending balance	158	161	158	161
Ending balance: individually evaluated for impairments	0	0	0	0
Ending balance: collectively evaluated for impairments	158	161	158	161
Ending balance	158	161	158	161
Loans
Ending balance	20,373	25,075	20,373	25,075
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	20,373	25,075	20,373	25,075
Unallocated
Allowance for loan losses
Beginning balance	509	472	476	371
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	128	21	161	122
Ending balance	637	493	637	493
Ending balance: individually evaluated for impairments	0	0	0	0
Ending balance: collectively evaluated for impairments	637	493	637	493
Ending balance	637	493	637	493
Loans
Ending balance	0	0	0	0
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	$ 0	$ 0	$ 0	$ 0

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Loans Receivable [Abstract]

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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