3. Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Allowance for loan losses
Beginning balance	$ 6,445	$ 6,366
Charge-offs	(164)	(106)
Recoveries	102	82
Provision	178	31
Ending balance	6,561	6,373
Ending balance: individually evaluated for impairments	1,023	1,091
Ending balance: collectively evaluated for impairments	5,538	5,282
Ending balance	6,561	6,373
Loans
Ending balance	823,557	765,824
Ending balance: individually evaluated for impairment	17,701	19,130
Ending balance: collectively evaluated for impairment	805,856	746,694
Construction and land development
Allowance for loan losses
Beginning balance	813	804
Charge-offs	0	0
Recoveries	1	1
Provision	17	(154)
Ending balance	831	651
Ending balance: individually evaluated for impairments	0	0
Ending balance: collectively evaluated for impairments	831	651
Ending balance	831	651
Loans
Ending balance	95,219	82,046
Ending balance: individually evaluated for impairment	95	96
Ending balance: collectively evaluated for impairment	95,124	81,950
Single-family residential
Allowance for loan losses
Beginning balance	1,325	1,812
Charge-offs	(13)	0
Recoveries	48	5
Provision	(104)	(177)
Ending balance	1,256	1,640
Ending balance: individually evaluated for impairments	2	0
Ending balance: collectively evaluated for impairments	1,254	1,640
Ending balance	1,256	1,640
Loans
Ending balance	255,338	244,061
Ending balance: individually evaluated for impairment	1,758	1,832
Ending balance: collectively evaluated for impairment	253,580	242,229
Single-family residential - Banco de la Gente stated income
Allowance for loan losses
Beginning balance	1,177	1,280
Charge-offs	0	0
Recoveries	0	0
Provision	(3)	(15)
Ending balance	1,174	1,265
Ending balance: individually evaluated for impairments	1,008	1,079
Ending balance: collectively evaluated for impairments	166	186
Ending balance	1,174	1,265
Loans
Ending balance	33,717	36,540
Ending balance: individually evaluated for impairment	14,127	15,190
Ending balance: collectively evaluated for impairment	19,590	21,350
Commercial
Allowance for loan losses
Beginning balance	1,278	1,193
Charge-offs	0	0
Recoveries	4	4
Provision	10	101
Ending balance	1,292	1,298
Ending balance: individually evaluated for impairments	13	12
Ending balance: collectively evaluated for impairments	1,279	1,286
Ending balance	1,292	1,298
Loans
Ending balance	278,619	261,636
Ending balance: individually evaluated for impairment	1,658	1,915
Ending balance: collectively evaluated for impairment	276,961	259,721
Multifamily and Farmland
Allowance for loan losses
Beginning balance	83	72
Charge-offs	0	(5)
Recoveries	0	1
Provision	15	5
Ending balance	98	73
Ending balance: individually evaluated for impairments	0	0
Ending balance: collectively evaluated for impairments	98	73
Ending balance	98	73
Loans
Ending balance	39,106	29,108
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	39,106	29,108
Commercial loans (not secured by real estate)
Allowance for loan losses
Beginning balance	626	574
Charge-offs	(1)	0
Recoveries	6	8
Provision	(21)	124
Ending balance	610	706
Ending balance: individually evaluated for impairments	0	0
Ending balance: collectively evaluated for impairments	610	706
Ending balance	610	706
Loans
Ending balance	101,572	89,304
Ending balance: individually evaluated for impairment	63	97
Ending balance: collectively evaluated for impairment	101,509	89,207
Farm loans (not secured by real estate)
Allowance for loan losses
Beginning balance	0	0
Charge-offs	0	0
Recoveries	0	0
Provision	0	0
Ending balance	0	0
Ending balance: individually evaluated for impairments	0	0
Ending balance: collectively evaluated for impairments	0	0
Ending balance	0	0
Loans
Ending balance	984	1,095
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	984	1,095
Consumer And All Other Loans
Allowance for loan losses
Beginning balance	161	155
Charge-offs	(150)	(101)
Recoveries	43	63
Provision	108	19
Ending balance	162	136
Ending balance: individually evaluated for impairments	0	0
Ending balance: collectively evaluated for impairments	162	136
Ending balance	162	136
Loans
Ending balance	19,002	22,034
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	19,002	22,034
Unallocated
Allowance for loan losses
Beginning balance	982	476
Charge-offs	0	0
Recoveries	0	0
Provision	156	128
Ending balance	1,138	604
Ending balance: individually evaluated for impairments	0	0
Ending balance: collectively evaluated for impairments	1,138	604
Ending balance	1,138	604
Loans
Ending balance	0	0
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	$ 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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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of direct write-downs of financing receivables charged against the allowance.

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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 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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