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Other Borrowed Funds - Summary of federal home loan bank, advances, by branch of FHLB bank (Detail) - Federal Home Loan Bank of Atlanta [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 129,600	$ 73,100
Federal Home Loan Bank Advance Fixed Rate One [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 15,000	$ 5,000
Interest rate	2.31%	2.42%
Maturity date	Oct. 01, 2019	Jan. 03, 2019
Federal Home Loan Bank Advance Fixed Rate Two [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 5,000	$ 2,800
Interest rate	2.58%	2.40%
Maturity date	Oct. 04, 2019	Jan. 07, 2019
Federal Home Loan Bank Advance Fixed Rate Three [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 5,000	$ 4,500
Interest rate	2.15%	2.38%
Maturity date	Oct. 16, 2019	Jan. 09, 2019
Federal Home Loan Bank Advance Fixed Rate Four [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 4,000	$ 5,000
Interest rate	2.59%	2.46%
Maturity date	Oct. 23, 2019	Jan. 16, 2019
Federal Home Loan Bank Advance Fixed Rate Five [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 3,500	$ 1,200
Interest rate	2.58%	2.49%
Maturity date	Oct. 30, 2019	Jan. 18, 2019
Federal Home Loan Bank Advance Fixed Rate Six [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 25,000	$ 8,000
Interest rate	2.24%	2.47%
Maturity date	Nov. 04, 2019	Jan. 31, 2019
Federal Home Loan Bank Advance Fixed Rate Seven [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 10,000	$ 3,000
Interest rate	2.13%	2.51%
Maturity date	Nov. 29, 2019	Mar. 08, 2019
Federal Home Loan Bank Advance Fixed Rate Eight [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 7,000	$ 2,000
Interest rate	2.51%	2.54%
Maturity date	Nov. 29, 2019	Mar. 19, 2019
Federal Home Loan Bank Advance Fixed Rate Nine [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 10,000	$ 5,000
Interest rate	2.46%	2.55%
Maturity date	Dec. 04, 2019	Apr. 01, 2019
Federal Home Loan Bank Advance Daily Rate Ten [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 10,000
Interest rate	2.07%
Maturity date	Dec. 30, 2019
Federal Home Loan Bank Advance Fixed Rate Ten [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance		$ 3,500
Interest rate		2.62%
Maturity date		Apr. 30, 2019
Federal Home Loan Bank Advance Fixed Rate Eleven [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 26,100	$ 4,000
Interest rate	2.49%	1.34%
Maturity date	May 04, 2020	May 31, 2019
Federal Home Loan Bank Advance Fixed Rate Twelve [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 5,000	$ 2,000
Interest rate	1.99%	2.66%
Maturity date	May 06, 2020	Jun. 19, 2019
Federal Home Loan Bank Advance Fixed Rate Thirteen [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance	$ 4,000	$ 1,000
Interest rate	2.15%	3.95%
Maturity date	Sep. 09, 2020	Aug. 27, 2019
Federal Home Loan Bank Advance Daily Rate Fourteen [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance		$ 22,100
Interest rate		2.65%
Maturity date		Aug. 30, 2019
Federal Home Loan Bank Advance Fixed Rate Fifteen [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance		$ 4,000
Interest rate		2.13%
Maturity date		Sep. 30, 2019

X

- Definition

Federal home loan bank advance branch of FHLB bank maturity date.

+ References

No definition available.

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- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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- Definition

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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