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Allowance for Loan Losses - Impaired Loans and Related Allowance (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 2,259	$ 3,947	$ 3,546
Recorded Investment with No Allowance	1,588	3,530	2,802
Recorded Investment with Allowance	587	0	634
Total Recorded Investment	2,175	3,530	3,436
Related Allowance	129	0	243
Average Recorded Investment	2,406	3,894	3,455
Interest Income Recognized	10	48	85
Real estate loans | Construction and Land Development
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	412	992	336
Recorded Investment with No Allowance	0	874	0
Recorded Investment with Allowance	398	0	327
Total Recorded Investment	398	874	327
Related Allowance	71	0	71
Average Recorded Investment	326	1,257	758
Interest Income Recognized	1	13	12
Real estate loans | Secured by 1-4 Family Residential
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,055	1,417	720
Recorded Investment with No Allowance	836	1,332	356
Recorded Investment with Allowance	154	0	307
Total Recorded Investment	990	1,332	663
Related Allowance	23	0	172
Average Recorded Investment	661	1,299	966
Interest Income Recognized	2	15	22
Real estate loans | Other real estate loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	792	1,464	2,290
Recorded Investment with No Allowance	752	1,263	2,249
Recorded Investment with Allowance	35	0	0
Total Recorded Investment	787	1,263	2,249
Related Allowance	35	0	0
Average Recorded Investment	1,329	1,274	1,585
Interest Income Recognized	7	19	51
Commercial and industrial loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	74	200
Recorded Investment with No Allowance	0	61	197
Recorded Investment with Allowance	0	0	0
Total Recorded Investment	0	61	197
Related Allowance	0	0	0
Average Recorded Investment	90	64	146
Interest Income Recognized	$ 0	$ 1	$ 0

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

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

+ References

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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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

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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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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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