3. Loans, Impaired (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Impaired loans
Unpaid Contractual Principal Balance	$ 25,338		$ 26,129
Recorded Investment With No Allowance	1,698		2,042
Recorded Investment With Allowance	24,441		22,599
Recorded Investment in Impaired Loans	26,139		24,641
Related Allowance	1,157		1,199
Average Outstanding Impaired Loans	24,244		26,015
Interest Income Recognized	351	$ 372	1,362
Construction and land development
Impaired loans
Unpaid Contractual Principal Balance	397		282
Recorded Investment With No Allowance	0		0
Recorded Investment With Allowance	265		277
Recorded Investment in Impaired Loans	265		277
Related Allowance	9		6
Average Outstanding Impaired Loans	333		253
Interest Income Recognized	6		17
Single-family residential
Impaired loans
Unpaid Contractual Principal Balance	5,080		5,226
Recorded Investment With No Allowance	1,124		1,135
Recorded Investment With Allowance	3,486		3,686
Recorded Investment in Impaired Loans	4,610		4,821
Related Allowance	37		41
Average Outstanding Impaired Loans	6,258		5,113
Interest Income Recognized	68		265
Single-family residential - Banco de la Gente stated income
Impaired loans
Unpaid Contractual Principal Balance	17,027		17,360
Recorded Investment With No Allowance	0		0
Recorded Investment With Allowance	17,639		16,805
Recorded Investment in Impaired Loans	17,639		16,805
Related Allowance	1,096		1,149
Average Outstanding Impaired Loans	15,099		16,867
Interest Income Recognized	238		920
Commercial
Impaired loans
Unpaid Contractual Principal Balance	2,420		2,761
Recorded Investment With No Allowance	477		807
Recorded Investment With Allowance	2,873		1,661
Recorded Investment in Impaired Loans	3,350		2,468
Related Allowance	13		1
Average Outstanding Impaired Loans	2,294		3,411
Interest Income Recognized	37		148
Multifamily and Farmland
Impaired loans
Unpaid Contractual Principal Balance	0		78
Recorded Investment With No Allowance	0		0
Recorded Investment With Allowance	78		12
Recorded Investment in Impaired Loans	78		12
Related Allowance	0		0
Average Outstanding Impaired Loans	6		28
Interest Income Recognized	0		0
Total real estate loans
Impaired loans
Unpaid Contractual Principal Balance	24,924		25,707
Recorded Investment With No Allowance	1,601		1,942
Recorded Investment With Allowance	24,341		22,441
Recorded Investment in Impaired Loans	25,942		24,383
Related Allowance	1,155		1,197
Average Outstanding Impaired Loans	23,990		25,672
Interest Income Recognized	349		1,350
Commercial loans (not secured by real estate)
Impaired loans
Unpaid Contractual Principal Balance	260		264
Recorded Investment With No Allowance	97		100
Recorded Investment With Allowance	(92)		4
Recorded Investment in Impaired Loans	5		104
Related Allowance	0		0
Average Outstanding Impaired Loans	102		149
Interest Income Recognized	0		3
Consumer loans (not secured by real estate)
Impaired loans
Unpaid Contractual Principal Balance	154		158
Recorded Investment With No Allowance	0		0
Recorded Investment With Allowance	192		154
Recorded Investment in Impaired Loans	192		154
Related Allowance	2		2
Average Outstanding Impaired Loans	152		194
Interest Income Recognized	$ 2		$ 9

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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