Prime Meridian Holding (PMHG) 10-Q 9 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 07, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	PMHG
Entity Registrant Name	Prime Meridian Holding Co
Entity Central Index Key	1,586,454
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		3,127,271

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 8,118	$ 6,971
Federal funds sold	18,479	20,148
Interest-bearing deposits	5,832	5,278
Total cash and cash equivalents	32,429	32,397
Securities available for sale	46,657	49,809
Loans held for sale	7,321	5,880
Loans, net of allowance for loan losses of $3,541 and $3,136	285,473	250,259
Federal Home Loan Bank stock	355	316
Premises and equipment, net	4,828	4,872
Accrued interest receivable	1,027	978
Bank-owned life insurance	1,778	1,757
Other assets	1,137	912
Total assets	381,005	347,180
Liabilities:
Noninterest-bearing demand deposits	76,564	76,216
Savings, NOW and money-market deposits	220,363	200,027
Time deposits	34,896	22,054
Total deposits	331,823	298,297
Official checks	602	1,146
Other liabilities	644	764
Total liabilities	333,069	300,207
Stockholders' equity:
Preferred stock, undesignated; 1,000,000 shares authorized, none issued or outstanding
Common stock, $.01 par value; 9,000,000 shares authorized, 3,125,233 and 3,118,977 issued and outstanding	31	31
Additional paid-in capital	38,098	37,953
Retained earnings	10,729	9,285
Accumulated other comprehensive loss	(922)	(296)
Total stockholders' equity	47,936	46,973
Total liabilities and stockholders' equity	$ 381,005	$ 347,180

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Loans receivable, allowance for loan losses	$ 3,541	$ 3,136
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	9,000,000	9,000,000
Common stock, shares issued	3,125,233	3,118,977
Common stock, shares outstanding	3,125,233	3,118,977

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Loans	$ 3,543	$ 2,838	$ 6,817	$ 5,473
Securities	287	248	575	457
Other	82	88	156	157
Total interest income	3,912	3,174	7,548	6,087
Interest expense-
Deposits	500	256	897	503
Net interest income	3,412	2,918	6,651	5,584
Provision for loan losses	155	120	409	155
Net interest income after provision for loan losses	3,257	2,798	6,242	5,429
Noninterest income:
Mortgage banking revenue	105	160	215	236
Income from bank-owned life insurance	10	11	21	23
Loss on sale of securities available for sale				(1)
Other income	110	89	212	170
Total noninterest income	314	341	624	589
Noninterest expense:
Salaries and employee benefits	1,218	982	2,446	2,054
Occupancy and equipment	226	233	461	480
Professional fees	97	82	181	145
Marketing	133	157	340	311
FDIC/State assessment	38	42	74	88
Software maintenance, amortization and other	159	133	307	262
Other	370	333	729	656
Total noninterest expense	2,241	1,962	4,538	3,996
Earnings before income taxes	1,330	1,177	2,328	2,022
Income taxes	328	412	572	721
Net earnings	$ 1,002	$ 765	$ 1,756	$ 1,301
Earnings per common share:
Basic	$ 0.32	$ 0.30	$ 0.56	$ 0.57
Diluted	$ 0.32	$ 0.30	0.56	0.57
Cash dividends per common share(1)			$ 0.10	$ 0.07
Deposit Account [Member]
Noninterest income:
Service charges and fees on deposit accounts	$ 89	$ 81	$ 176	$ 161

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,002	$ 765	$ 1,756	$ 1,301
Change in unrealized (loss) gain on securities:
Unrealized (loss) gain arising during the period	(108)	258	(838)	333
Reclassification adjustment for realized loss				1
Net change in unrealized (loss) gain	(108)	258	(838)	334
Deferred income tax benefit (expense) on above change	27	(96)	212	(124)
Total other comprehensive (loss) income	(81)	162	(626)	210
Comprehensive income	$ 921	$ 927	$ 1,130	$ 1,511

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance, Value at Dec. 31, 2016	$ 27,082	$ 20	$ 20,732	$ 6,563	$ (233)
Beginning Balance, Shares at Dec. 31, 2016		2,004,707
Net earnings (unaudited)	1,301			1,301
Dividends paid (unaudited)	(140)			(140)
Net change in unrealized gain/loss on securities available for sale, net of income taxes (unaudited)	210				210
Stock options exercised (unaudited), Value	5		5
Stock options exercised (unaudited), Shares		500
Common stock issued as compensation to directors (unaudited), Value	35		35
Common stock issued as compensation to directors (unaudited), Shares		2,165
Sale of common stock (unaudited) net of stock offering costs, Value	16,957	$ 11	16,946
Sale of common stock (unaudited) net of stock offering costs, Shares		1,090,908
Stock-based compensation (unaudited)	15		15
Ending Balance (unaudited), Value at Jun. 30, 2017	45,465	$ 31	37,733	7,724	(23)
Ending Balance (unaudited), Shares at Jun. 30, 2017		3,098,280
Beginning Balance, Value at Dec. 31, 2016	27,082	$ 20	20,732	6,563	(233)
Beginning Balance, Shares at Dec. 31, 2016		2,004,707
Ending Balance (unaudited), Value at Dec. 31, 2017	$ 46,973	$ 31	37,953	9,285	(296)
Ending Balance (unaudited), Shares at Dec. 31, 2017	3,118,977	3,118,977
Net earnings (unaudited)	$ 1,756			1,756
Dividends paid (unaudited)	(312)			(312)
Net change in unrealized gain/loss on securities available for sale, net of income taxes (unaudited)	(626)				(626)
Stock options exercised (unaudited), Value	47		47
Stock options exercised (unaudited), Shares		4,700
Common stock issued as compensation to directors (unaudited), Value	34		34
Common stock issued as compensation to directors (unaudited), Shares		1,556
Stock-based compensation (unaudited)	64		64
Ending Balance (unaudited), Value at Jun. 30, 2018	$ 47,936	$ 31	$ 38,098	$ 10,729	$ (922)
Ending Balance (unaudited), Shares at Jun. 30, 2018	3,125,233	3,125,233

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Sale of common stock, net of stock offering costs	$ 1,042,905
Additional Paid-in Capital [Member]
Sale of common stock, net of stock offering costs	$ 1,042,905

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net earnings	$ 1,756	$ 1,301
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	265	261
Provision for loan losses	409	155
Net amortization of deferred loan fees	(15)	(79)
Loss on sale of securities available for sale		1
Amortization of premiums and discounts on securities available for sale	205	191
Gain on sale of loans held for sale	(168)	(154)
Proceeds from the sale of loans held for sale	37,011	34,551
Loans originated as held for sale	(38,284)	(34,909)
Stock issued as compensation	34	35
Stock-based compensation expense	64	15
Income from bank-owned life insurance	(21)	(23)
Net increase in accrued interest receivable	(49)	(20)
Net increase in other assets	(13)	(184)
Net (decrease) increase in other liabilities and official checks	(664)	75
Net cash provided by operating activities	530	1,216
Cash flows from investing activities:
Loan originations, net of principal repayments	(35,608)	(19,457)
Purchase of securities available for sale	(1,003)	(13,548)
Principal repayments of securities available for sale	3,083	2,345
Proceeds from sale of securities available for sale		750
Maturities and calls of securities available for sale	29	28
Purchase of Federal Home Loan Bank stock	(39)	(54)
Purchase of premises and equipment	(221)	(344)
Net cash used in investing activities	(33,759)	(30,280)
Cash flows from financing activities:
Net increase in deposits	33,526	16,866
Proceeds from stock options exercised	47	5
Proceeds from sale of common stock, net		16,957
Common stock dividends paid	(312)	(140)
Net cash provided by financing activities	33,261	33,688
Net increase in cash and cash equivalents	32	4,624
Cash and cash equivalents at beginning of period	32,397	36,165
Cash and cash equivalents at end of period	32,429	40,789
Supplemental disclosure of cash flow information Cash paid during the period:
Interest	875	503
Income taxes	610	815
Noncash transaction-
Accumulated other comprehensive loss, net change in unrealized (loss) gain on securities available for sale, net of taxes	$ (626)	$ 210

General

General	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
General	(1) General Prime Meridian Holding Company (“PMHG”) owns 100% of the outstanding common stock of Prime Meridian Bank (the “Bank”) (collectively the “Company”). PMHG’s primary activity is the operation of the Bank. The Bank is a Florida state-chartered commercial bank, and the deposit accounts of the Bank are insured up to the applicable limits by the Federal Deposit Insurance Corporation (“FDIC”). The Bank offers a variety of community banking services to individual and corporate clients through its three banking offices located in Tallahassee and Crawfordville, Florida and its online banking platform. The accounting and financial reporting policies the Company follows conform, in all material respects, to accounting principles generally accepted in the United States (“GAAP”) and to general practices within the banking industry. The condensed consolidated financial statements in the Quarterly Report on Form 10-Q 10-Q 10-K Comprehensive Income. available-for-sale Stock-Based Compensation. Mortgage Banking Revenue. Reclassifications. (continued) Recent Accounting Standards Update. No. 2016-01, Financial Instruments-Overall (Subtopic 825-10): available-for-sale In February 2016, the FASB issued ASU No. 2016-2, Leases (Topic 842) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326) available-for-sale The new guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The Company is in the process of determining the effect of the ASU on its condensed consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, Business In March 2017, the FASB issued ASU No. 2017-08, In February 2018, the FASB issued ASU No. 2018-02), Income Statement Reporting Comprehensive Income (Topic 220) In June 2018, the FASB issued ASU No. 2018-07, (continued) Consequently, the accounting for share-based payments to nonemployees and employees will be substantially aligned. The ASU supersedes Subtopic 505-50, Non-Employees.

Securities Available for Sale

Securities Available for Sale	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Securities Available for Sale	(2) Securities Available for Sale Securities are classified according to management’s intent. The carrying amount of securities and fair values are as follows: Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (in thousands) At June 30, 2018 U.S. Government agency securities $ 1,075 $ — $ (24 ) $ 1,051 Municipal securities 12,204 58 (161 ) 12,101 Mortgage-backed securities 34,612 18 (1,125 ) 33,505 Total $ 47,891 $ 76 $ (1,310 ) $ 46,657 At December 31, 2017 U.S. Government agency securities $ 1,251 $ 6 $ (8 ) $ 1,249 Municipal securities 12,340 128 (95 ) 12,373 Mortgage-backed securities 36,614 23 (450 ) 36,187 Total $ 50,205 $ 157 $ (553 ) $ 49,809 The following table summarizes the sale of securities available for sale. Three Months Ended Six Months Ended June 30, June 30, (in thousands) 2018 2017 2018 2017 Proceeds from sale of securities $ — $ — $ — $ 750 Gross gains — — — — Gross losses — — — (1 ) Net loss on sale of securities $ — $ — $ — $ (1 ) (continued) Securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, are as follows: Less Than Twelve Months Over Twelve Months Gross Gross Unrealized Fair Unrealized Fair Losses Value Losses Value (in thousands) At June 30, 2018 Securities Available for Sale U.S. Government agency securities $ (24 ) $ 1,051 $ — $ — Municipal securities (93 ) 4,421 (68 ) 2,369 Mortgage-backed securities (753 ) 24,431 (372 ) 8,430 Total $ (870 ) $ 29,903 $ (440 ) $ 10,799 At December 31, 2017 Securities Available for Sale U.S. Government agency securities $ (8 ) $ 694 $ — $ — Municipal securities (36 ) 1,831 (59 ) 1,203 Mortgage-backed securities (308 ) 29,742 (142 ) 5,667 Total $ (352 ) $ 32,267 $ (201 ) $ 6,870 The unrealized losses at June 30, 2018 and December 31, 2017 on forty and thirty-four securities, respectively, were caused by market conditions. It is expected that the securities would not be settled at a price less than the par value of the investments. Because the decline in fair value is attributable to market conditions and not credit quality, and because the Company has the ability and intent to hold these investments until a market price recovery or maturity, these investments are not considered other-than-temporarily impaired. Securities available for sale measured at fair value on a recurring basis are summarized below: Fair Value Measurements Using Fair Value Quoted Prices (Level 1) Significant Significant (Level 3) (in thousands) At June 30, 2018 U.S. Government agency securities $ 1,051 $ — $ 1,051 $ — Municipal securities 12,101 — 12,101 — Mortgage-backed securities 33,505 — 33,505 — Total $ 46,657 $ — $ 46,657 $ — At December 31, 2017 U.S. Government agency securities $ 1,249 $ — $ 1,249 $ — Municipal securities 12,373 — 12,373 — Mortgage-backed securities 36,187 — 36,187 — Total $ 49,809 $ — $ 49,809 $ — During the three and six months ended June 30, 2018 and 2017, no securities were transferred in or out of Levels 1, 2 or 3. The scheduled maturities of securities are as follows: At June 30, 2018 Amortized Fair Value (in thousands) Due in less than one year $ 502 $ 503 Due in one to five years 3,672 3,638 Due in five to ten years 6,378 6,388 Due after ten years 2,727 2,623 Mortgage-backed securities 34,612 33,505 Total $ 47,891 $ 46,657

Loans

Loans	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Loans	(3) Loans The composition of the Company’s loan portfolio, excluding loans held for sale, was the following for the periods presented below: (in thousands) At June 30, At December 31, Real estate mortgage loans: Commercial $ 89,482 $ 79,565 Residential and home equity 113,715 94,824 Construction 32,266 26,813 Total real estate mortgage loans 235,463 201,202 Commercial loans 46,006 44,027 Consumer and other loans 7,136 7,742 Total loans 288,605 252,971 Add (deduct): Net deferred loan costs 409 424 Allowance for loan losses (3,541 ) (3,136 ) Loans, net $ 285,473 $ 250,259 An analysis of the change in allowance for loan losses follows: Real Estate Mortgage Loans (in thousands) Commercial Residential Construction Commercial Consumer Total Three-Month Period Ended June 30, 2018 Beginning balance $ 977 $ 1,208 $ 372 $ 745 $ 83 $ 3,385 Provision for loan losses 24 101 28 2 — 155 Net (charge-offs) recoveries — — — 2 (1 ) 1 Ending balance $ 1,001 $ 1,309 $ 400 $ 749 $ 82 $ 3,541 Three-Month Period Ended June 30, 2017 Beginning balance $ 767 $ 1,086 $ 293 $ 704 $ 58 $ 2,908 Provision for loan losses 44 22 45 6 3 120 Net (charge-offs) recoveries — — — 2 (2 ) — Ending balance $ 811 $ 1,108 $ 338 $ 712 $ 59 $ 3,028 Six-Month Beginning balance $ 894 $ 1,097 $ 331 $ 724 $ 90 $ 3,136 Provision (credit) for loan losses 107 212 69 22 (1 ) 409 Net (charge-offs) recoveries — — — 3 (7 ) (4 ) Ending balance $ 1,001 $ 1,309 $ 400 $ 749 $ 82 $ 3,541 Six-Month Beginning balance $ 775 $ 1,074 $ 258 $ 714 $ 55 $ 2,876 Provision (credit) for loan losses 36 34 80 (4 ) 9 155 Net (charge-offs) recoveries — — — 2 (5 ) (3 ) Ending balance $ 811 $ 1,108 $ 338 $ 712 $ 59 $ 3,028 At June 30, 2018 Individually evaluated for impairment: Recorded investment $ 611 $ 240 $ — $ 133 $ — $ 984 Balance in allowance for loan losses $ — $ — $ — $ 133 $ — $ 133 Collectively evaluated for impairment: Recorded investment $ 88,871 $ 113,475 $ 32,266 $ 45,873 $ 7,136 $ 287,621 Balance in allowance for loan losses $ 1,001 $ 1,309 $ 400 $ 616 $ 82 $ 3,408 At December 31, 2017 Individually evaluated for impairment: Recorded investment $ — $ — $ — $ 134 $ — $ 134 Balance in allowance for loan losses $ — $ — $ — $ 134 $ — $ 134 Collectively evaluated for impairment: Recorded investment $ 79,565 $ 94,824 $ 26,813 $ 43,893 $ 7,742 $ 252,837 Balance in allowance for loan losses $ 894 $ 1,097 $ 331 $ 590 $ 90 $ 3,002 The Company has divided the loan portfolio into three portfolio segments and five portfolio classes, each with different risk characteristics and methodologies for assessing risk. All loans are underwritten based upon standards set forth in the policies approved by the Company’s Board of Directors. The Company identifies the portfolio segments and classes as follows: Real Estate Mortgage Loans. Commercial. mixed-use Residential and Home Equity. one-to-four 1-year, 3-year, 5-year, 7-year 15-year 30-year Construction. Commercial Loans. Small-to-medium Other factors of risk could include changes in the borrower’s management and fluctuations in collateral value. Additionally, there may be refinancing risk if a commercial loan includes a balloon payment which must be refinanced or paid off at loan maturity. In reference to our risk management process, our commercial loan portfolio presents a higher risk profile than our consumer real estate and consumer loan portfolios. Therefore, we require that all loans to businesses must have a clearly stated and reasonable payment plan to allow for timely retirement of debt, unless secured by liquid collateral or as otherwise justified. Consumer and Other Loans. The following summarizes the loan credit quality: Real Estate Mortgage Loans (in thousands) Commercial Residential and Home Equity Construction Commercial Loans Consumer and Other Loans Total At June 30, 2018 Grade: Pass $ 84,019 $ 110,717 $ 32,101 $ 43,994 $ 7,041 $ 277,872 Special mention 4,852 2,835 — 1,235 95 9,017 Substandard 611 163 165 777 — 1,716 Doubtful — — — — — — Loss — — — — — — Total $ 89,482 $ 113,715 $ 32,266 $ 46,006 $ 7,136 $ 288,605 At December 31, 2017 Grade: Pass $ 74,560 $ 92,282 $ 26,356 $ 42,874 $ 7,715 $ 243,787 Special mention 4,382 2,122 298 591 27 7,420 Substandard 623 420 159 562 — 1,764 Doubtful — — — — — — Loss — — — — — — Total $ 79,565 $ 94,824 $ 26,813 $ 44,027 $ 7,742 $ 252,971 The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. Loans classified as substandard or special mention are reviewed quarterly by the Company for further deterioration or improvement to determine if they are appropriately classified and whether there is any impairment. All loans are graded upon initial issuance. Furthermore, construction loans, nonowner-occupied commercial real estate loans, and commercial loan relationships in excess of $500,000 are reviewed at least annually. The Company determines the appropriate loan grade during the renewal process and reevaluates the loan grade in situations when a loan becomes past due. Loans excluded from the review process above are generally classified as pass credits until: (a) they become past due; (b) management becomes aware of deterioration in the credit worthiness of the borrower; or (c) the client contacts the Company for a modification. In these circumstances, the loan is specifically evaluated for potential classification as to special mention, substandard or even charged-off. Pass Special Mention Substandard Doubtful Loss At June 30, 2018, there were two nonaccrual loans, totaling $90,000. Age analysis of past due loans is as follows: Accruing Loans (in thousands) 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days Past Due Total Past Due Current Nonaccrual Loans Total Loans At June 30, 2018: Real estate mortgage loans: Commercial $ 42 $ 300 $ — $ 342 $ 89,140 $ — $ 89,482 Residential and home equity 215 — — 215 113,500 — 113,715 Construction — — — — 32,266 — 32,266 Commercial loans — — — — 45,916 90 46,006 Consumer and other loans — — — — 7,136 — 7,136 Total $ 257 $ 300 $ — $ 557 $ 287,958 $ 90 $ 288,605 At December 31, 2017: Real estate mortgage loans: Commercial $ — $ 623 $ — $ 623 $ 78,942 $ — $ 79,565 Residential and home equity — 255 — 255 94,569 — 94,824 Construction — — — — 26,813 — 26,813 Commercial loans — — — — 43,893 134 44,027 Consumer and other loans — — — — 7,742 — 7,742 Total $ — $ 878 $ — $ 878 $ 251,959 $ 134 $ 252,971 The following summarizes the amount of impaired loans: With No Related Allowance Recorded With an Allowance Recorded Total (in thousands) Recorded Investment Unpaid Contractual Principal Balance Recorded Investment Unpaid Contractual Principal Balance Related Allowance Recorded Investment Unpaid Contractual Principal Balance Related Allowance At June 30, 2018: Real estate mortgage loans: Commercial $ 611 $ 611 $ — $ — $ — $ 611 $ 611 $ — Residential & home equity 240 240 — — — 240 240 — Commercial loans — — 133 133 133 133 133 133 Total $ 851 $ 851 $ 133 $ 133 $ 133 $ 984 $ 984 $ 133 At December 31, 2017: Commercial loans $ — $ — $ 134 $ 134 $ 134 $ 134 $ 134 $ 134 Total $ — $ — $ 134 $ 134 $ 134 $ 134 $ 134 $ 134 The average net investment in impaired loans and interest income recognized and received on impaired loans are as follows: Three Months Ended June 30, 2018 2017 (in thousands) Average Recorded Investment Interest Income Recognized Interest Income Received Average Recorded Investment Interest Income Recognized Interest Income Received Real estate mortgage loans: Commercial $ 611 $ — $ — $ — $ — $ — Residential & home equity 251 1 — 481 22 27 Construction — — — 74 — — Commercial loans 156 — — 67 — 1 Total $ 1,018 $ 1 $ — $ 622 $ 22 $ 28 Six Months Ended June 30, 2018 2017 (in thousands) Average Interest Interest Average Interest Interest Real estate mortgage loans: Commercial $ 328 $ — $ — $ — $ — $ — Residential & home equity 212 1 — 562 22 28 Construction — — 2 74 — — Commercial loans 152 — — 69 — 1 Total $ 692 $ 1 $ 2 $ 705 $ 22 $ 29 There were no collateral dependent loans measured at fair value on a nonrecurring basis at June 30, 2018 or 2017. The restructuring of a loan constitutes a troubled debt restructuring (“TDR”) if the creditor grants a concession to the debtor that it would not otherwise consider in the normal course of business. A concession may include an extension of repayment terms which would not normally be granted, a reduction in interest rate or the forgiveness of principal and/or accrued interest. All TDRs are evaluated individually for impairment on a quarterly basis as part of the allowance for loan losses calculation. The Company entered into one new TDR during the quarter ended June 30, 2018 and during the six months ended June 30, 2018 and 2017. The Company had no new TDRs during the quarter ended June 30, 2017. Three Months Ended June 30, 2018 2017 ( dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Current Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Current Modification Outstanding Recorded Investment Troubled Debt Restructurings - Commercial real estate: Modified principal 1 $ 619 $ 611 $ 611 — $ — $ — $ — Total 1 $ 619 $ 611 $ 611 — $ — $ — $ — Six Months Ended June 30, 2018 2017 (dollars in thousands) Number of Contracts Pre- Post- Current Number of Contracts Pre- Post- Current Troubled Debt Restructurings - Commercial real estate: Modified principal 1 $ 619 $ 611 $ 611 $ 1 $ 153 $ 169 $ 167 Total 1 $ 619 $ 611 $ 611 $ 1 $ 153 $ 169 $ 167 At June 30, 2018, the Company had $655,000 in loans identified as TDRs. The TDR entered into during the quarter ended June 30, 2018 did not subsequently default during that period.

Regulatory Capital

Regulatory Capital	6 Months Ended
	Jun. 30, 2018
Banking and Thrift [Abstract]
Regulatory Capital	(4) Regulatory Capital The Bank is subject to various regulatory capital requirements administered by the banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s and the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measures of the Bank’s assets, liabilities, and certain off-balance Effective January 1, 2015, the Bank, became subject to the new Basel III capital level threshold requirements under the Prompt Corrective Action regulations with full compliance with all of the final rule’s requirements phased in over a multi-year schedule. These new regulations were designed to ensure that banks maintain strong capital positions even in the event of severe economic downturns or unforeseen losses. Changes that could affect the Bank going forward include additional constraints on the inclusion of deferred tax assets in capital and increased risk weightings for nonperforming loans and acquisition/development loans in regulatory capital. Beginning January 1, 2016, the Bank became subject to the capital conservation buffer rules which place limitations on distributions, including dividend payments, and certain discretionary bonus payments to executive officers. In order to avoid these limitations, a bank must hold a capital conservation buffer above its minimum risk-based capital requirements. As of June 30, 2018, the Bank’s capital conservation buffer exceeds the minimum requirement designated for June 30, 2018 of 1.875%. The required buffer of 2.5% will be effective January 1, 2019. Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and percentages (set forth in the table below) of total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). Management believes, as of June 30, 2018 that the Bank meets all capital adequacy requirements to which it is subject. As of June 30, 2018, the Bank is well capitalized under the regulatory framework for prompt corrective action. To be categorized as adequately capitalized, the Bank must maintain minimum total risk-based, Tier 1 risk-based, and Tier 1 leverage percentages as set forth in the table. There are no conditions or events since that notification that management believes have changed the Bank’s category. The Bank’s actual capital amounts and percentages are also presented in the following table. Actual For Capital Adequacy For Well Capitalized (dollars in thousands) Amount Percentage Amount Percentage Amount Percentage As of June 30, 2018 Tier 1 Leverage Capital $ 35,213 9.68 % $ 14,554 4.00 % $ 18,192 5.00 % Common Equity Tier 1 Risk-based Capital 35,213 12.28 12,905 4.50 18,641 6.50 Tier 1 Risk-based Capital 35,213 12.28 17,207 6.00 22,942 8.00 Total Risk-based Capital 38,754 13.51 22,942 8.00 28,678 10.00 As of December 31, 2017 Tier 1 Leverage Capital $ 33,146 9.48 % $ 13,983 4.00 % $ 17,479 5.00 % Common Equity Tier 1 Risk-based Capital 33,146 12.80 11,654 4.50 16,834 6.50 Tier 1 Risk-based Capital 33,146 12.80 15,539 6.00 20,718 8.00 Total Risk-based Capital 36,282 14.01 20,718 8.00 25,898 10.00

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	(5) Earnings Per Share Earnings per share, (“EPS”) have been computed on the basis of the weighted-average number of shares of common stock outstanding. For the three and six months ended June 30, 2018 and 2017, outstanding stock options are considered dilutive securities for purposes of calculating diluted EPS which was computed using the treasury stock method. 2018 2017 Weighted- Per Weighted- Per Average Share Average Share (dollars in thousands, except per share amounts) Earnings Shares Amount Earnings Shares Amount Three Months Ending June 30: Basic EPS: Net earnings $ 1,002 3,123,594 $ 0.32 $ 765 2,589,921 $ 0.30 Effect of dilutive securities-incremental shares from assumed conversion of options 2,428 2,977 Diluted EPS: Net earnings $ 1,002 3,126,022 $ 0.32 $ 765 2,592,898 $ 0.30 Six Months Ending June 30: Basic EPS: Net earnings $ 1,756 3,122,112 $ 0.56 $ 1,301 2,299,508 $ 0.57 Effect of dilutive securities-incremental shares from assumed conversion of options 5,375 6,261 Diluted EPS: Net earnings $ 1,756 3,127,487 $ 0.56 $ 1,301 2,305,769 $ 0.57

Stock Option Plans

Stock Option Plans	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Plans	(6) Stock Option Plans The 2015 Stock Incentive Compensation Plan (the “2015 Plan”) was approved by the Shareholders at the Company’s annual meeting of shareholders on May 20, 2015 and permits the Company to grant the Company’s key employees and directors stock options, stock appreciation rights, performance shares, and phantom stock. Under the 2015 Plan, the number of shares which may be issued is 500,000, but in no instance more than 15% of the issued and outstanding shares of the Company’s common stock. During the second quarter of 2018, the Company issued 120,000 Non-Qualified During the second quarter of 2018, the Company issued Incentive Stock Options (“ISO”) to its employees. The Company issued 25,000 ISOs to its CEO and 92,250 ISOs to its remaining employees. These ISOs vest over 5 years and expire in increments beginning April 1, 2024 and concluding April 1, 2028. As of June 30, 2018, 252,917 stock options have been granted under the 2015 Plan and 204,328 options are available for grant. Number Weighted- Weighted- Aggregate Outstanding at December 31, 2016 — $ — Options granted 11,540 17.03 Outstanding at June 30, 2017 11,540 $ 17.03 Outstanding at December 31, 2017 11,540 $ 17.03 Options granted 252,917 19.79 Outstanding at June 30, 2018 264,457 $ 19.79 8.85 years $ 311,000 Exercisable at June 30, 2018 37,207 $ 17.93 3.31 years $ 113,000 The fair value of shares vested and recognized as compensation expense was $64,000 and $15,000 for the six months ended June 30, 2018 and 2017, respectively. At June 30, 2018, there was $732,000 in unrecognized compensation expense related to nonvested share-based compensation arrangements granted under the 2015 Plan, with an average remaining life of 56 months. At June 30, 2017, there was no unrecognized compensation expense related to nonvested share-based compensation arrangements granted under the 2015 plan. The fair value of each option granted during the six months ended June 30, 2018 was estimated on the date of grant using the Black-Scholes option-pricing model with the following range of assumptions: Weighted average risk-free interest rate 1.47 - 2.63 % Expected dividend yield 0.41 - 0.50 % Expected stock volatility 10.70 - 11.90 % Expected life in years 2.5 - 6.5 Per share fair value of options issued during period $ 1.49 - $3.35 The Company used the guidance in Staff Accounting Bulletin No. 107 to determine the estimated life of options issued. Expected volatility is based on volatility of similar companies’ common stock. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The dividend yield is based on the Company’s history and expectation of dividend payouts. As of May 20, 2015, no further grants will be made under the 2007 Stock Option Plan (the “2007 Plan”). Unexercised stock options that were granted under the 2007 Plan will remain outstanding and will expire under the terms of the individual stock grant. A summary of the activity in the Company’s 2007 Stock Option Plan is as follows: Weighted- Weighted- Average Average Remaining Aggregate Number of Exercise Contractual Intrinsic Options Price Term Value Outstanding at December 31, 2016 42,200 $ 10.16 Options exercised (500 ) 10.00 Options forfeited (200 ) 10.00 Outstanding at June 30, 2017 41,500 $ 10.16 Options exercised (18,950 ) $ 10.00 Options forfeited (350 ) $ 10.00 Outstanding at December 31, 2017 22,200 $ 10.31 Options exercised (4,700 ) 10.00 Outstanding at June 30, 2018 17,500 $ 10.39 1.26 years $ 185,000 Exercisable at June 30, 2018 17,500 $ 10.39 1.26 years $ 185,000 At June 30, 2018, there was no unrecognized compensation expense related to nonvested share-based compensation arrangements granted under the 2007 plan. In 2012, the Company’s Board of Directors and shareholders adopted the Directors’ Plan. The Directors’ Plan permits the Company’s and the Bank’s directors to elect to receive any compensation to be paid to them in shares of the Company’s common stock. Pursuant to the Directors’ Plan, each director is permitted to make an election to receive shares of stock instead of cash. To encourage directors to elect to receive stock, the Directors’ Plan provides that if a director elects to receive stock, he or she will receive in common stock 110% of the amount of cash fees set by the Board or the Compensation and Nominating Committee. The value of stock to be awarded pursuant to the Directors’ Plan will be the closing price of a share of common stock as traded on the Over-the

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances	6 Months Ended
	Jun. 30, 2018
Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances	(7) Federal Home Loan Bank Advances Federal Home Loan Bank (“FHLB”) advances are collateralized by a blanket lien on qualifying residential real estate, commercial real estate, home equity lines of credit and multi-family loans. Under this blanket lien, the Company could borrow up to $37.1 million at June 30, 2018. At June 30, 2018 and December 31, 2017, the Company had no outstanding loans under this line.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	(8) Fair Value of Financial Instruments The estimated fair values and fair value measurement method with respect to the Company’s financial instruments were as follows: At June 30, 2018 At December 31, 2017 Carrying Fair Carrying Fair (in thousands) Level Amount Value Amount Value Financial assets: Cash and cash equivalents 1 $ 32,429 $ 32,429 $ 32,397 $ 32,397 Securities available for sale 2 46,657 46,657 49,809 49,809 Loans held for sale 3 7,321 7,354 5,880 6,039 Loans, net 3 285,473 283,741 250,259 249,628 Federal Home Loan Bank stock 3 355 355 316 316 Accrued interest receivable 3 1,027 1,027 978 978 Financial liabilities- Deposits 3 331,823 332,010 298,297 298,403 Off-Balance 3 — — — — Discussion regarding the assumptions used to compute the estimated fair values of financial instruments can be found in Note 1 to the consolidated financial statements included in the Company’s annual report on Form 10-K

Off-Balance Sheet Financial Ins

Off-Balance Sheet Financial Instruments	6 Months Ended
	Jun. 30, 2018
Text Block [Abstract]
Off-Balance Sheet Financial Instruments	(9) Off-Balance The Company is a party to financial instruments with off-balance interest-rate The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for available lines of credit, construction loans in process and standby letters of credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments as it does for on-balance Commitments to extend credit, construction loans in process and unused lines of credit are agreements to lend to a client as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since some of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each client’s credit worthiness on a case-by-case Standby letters of credit are written conditional commitments issued by the Company to guarantee the performance of a client to a third party. These letters of credit are primarily issued to support third-party borrowing arrangements and generally have expiration dates within one year of issuance. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to clients. In the event the client does not perform in accordance with the terms of the agreement with the third party, we would be required to fund the commitment. The maximum potential amount of future payments we could be required to make is represented by the contractual amount of the commitment. If the commitment is funded, we would be entitled to seek recovery from the client. Some of the Company’s standby letters of credit are secured by collateral and those secured letters of credit totaled $565,000 at June 30, 2018. Guaranteed accounts are irrevocable standby letters of credit issued by us to guarantee a client’s credit line with our third-party credit card company, First Arkansas Bank & Trust. As a part of this agreement, we are responsible for the established credit limit on certain accounts plus 10%. The maximum potential amount of future payments we could be required to make is represented by the dollar amount disclosed in the table below. Standby letters of credit and commitments to extend credit typically result in loans with a market interest rate when funded. The maximum potential amount of future payments we could be required to make for off-balance (in thousands) At June 30, 2018 Commitments to extend credit $ 3,007 Construction loans in process $ 16,459 Unused lines of credit $ 39,585 Standby letters of credit $ 1,894 Standby performance letters of credit $ 378 Guaranteed accounts $ 1,328

Premises and Equipment

Premises and Equipment	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Premises and Equipment	(10) Premises and Equipment Effective August 6, 2018, Prime Meridian Holding Company’s (the “Company”) wholly-owned subsidiary, Prime Meridian Bank (the “Bank”), entered into a Retail Lease (the “Lease”) at its Timberlane location with the new owner of the property, LG Tallahassee Market Square, LLC (the “Landlord”). The Lease allows for the operation of a full-service banking office at 1471 Timberlane Road, Tallahassee, Florida 32312. The term of the Lease is 15 years, with four options to renew for five years each. The Lease requires the Landlord to seek approval from the City of Tallahassee for a lot line adjustment. Once this approval is received, the Landlord has six months from the approval date to deliver notice and proof of a Certificate of Completion (the “Delivery Date”), certifying that the Landlord’s improvement obligations are complete. The new rent obligations will commence 120 days after the Delivery Date (the “Rent Commencement Date”) and are as follows: Years Annual Rent Amount 1-5 $ 294,000 6-10 $ 323,400 11-15 $ 355,740 Prior to the Rent Commencement Date, the Bank will pay rent in accordance with its prior lease as disclosed in the Company’s annual report on Form 10-K for the year ended December 31, 2017. The Lease is a fully net lease, with the Bank separately paying real and personal property taxes, all special and third party assessments, common area maintenance charges, maintenance costs, and insurance expenses.

General (Policies)

General (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Comprehensive Income	Comprehensive Income. available-for-sale
Stock-Based Compensation	Stock-Based Compensation.
Mortgage Banking Revenue	Mortgage Banking Revenue.
Reclassifications	Reclassifications.
Recent Accounting Standards Update	Recent Accounting Standards Update. No. 2016-01, Financial Instruments-Overall (Subtopic 825-10): available-for-sale In February 2016, the FASB issued ASU No. 2016-2, Leases (Topic 842) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326) available-for-sale The new guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The Company is in the process of determining the effect of the ASU on its condensed consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, Business In March 2017, the FASB issued ASU No. 2017-08, In February 2018, the FASB issued ASU No. 2018-02), Income Statement Reporting Comprehensive Income (Topic 220)

Securities Available for Sale (

Securities Available for Sale (Tables)	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Summary of Carrying Amount and Fair Values of Securities	Securities are classified according to management’s intent. The carrying amount of securities and fair values are as follows: Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (in thousands) At June 30, 2018 U.S. Government agency securities $ 1,075 $ — $ (24 ) $ 1,051 Municipal securities 12,204 58 (161 ) 12,101 Mortgage-backed securities 34,612 18 (1,125 ) 33,505 Total $ 47,891 $ 76 $ (1,310 ) $ 46,657 At December 31, 2017 U.S. Government agency securities $ 1,251 $ 6 $ (8 ) $ 1,249 Municipal securities 12,340 128 (95 ) 12,373 Mortgage-backed securities 36,614 23 (450 ) 36,187 Total $ 50,205 $ 157 $ (553 ) $ 49,809
Schedule of Sale of Securities Available for Sale	The following table summarizes the sale of securities available for sale. Three Months Ended Six Months Ended June 30, June 30, (in thousands) 2018 2017 2018 2017 Proceeds from sale of securities $ — $ — $ — $ 750 Gross gains — — — — Gross losses — — — (1 ) Net loss on sale of securities $ — $ — $ — $ (1 )
Summary of Securities in Continuous Unrealized Loss Position	Securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, are as follows: Less Than Twelve Months Over Twelve Months Gross Gross Unrealized Fair Unrealized Fair Losses Value Losses Value (in thousands) At June 30, 2018 Securities Available for Sale U.S. Government agency securities $ (24 ) $ 1,051 $ — $ — Municipal securities (93 ) 4,421 (68 ) 2,369 Mortgage-backed securities (753 ) 24,431 (372 ) 8,430 Total $ (870 ) $ 29,903 $ (440 ) $ 10,799 At December 31, 2017 Securities Available for Sale U.S. Government agency securities $ (8 ) $ 694 $ — $ — Municipal securities (36 ) 1,831 (59 ) 1,203 Mortgage-backed securities (308 ) 29,742 (142 ) 5,667 Total $ (352 ) $ 32,267 $ (201 ) $ 6,870
Securities Available for Sale Measured at Fair Value on Recurring Basis	Fair Value Measurements Using Fair Value Quoted Prices (Level 1) Significant Significant (Level 3) (in thousands) At June 30, 2018 U.S. Government agency securities $ 1,051 $ — $ 1,051 $ — Municipal securities 12,101 — 12,101 — Mortgage-backed securities 33,505 — 33,505 — Total $ 46,657 $ — $ 46,657 $ — At December 31, 2017 U.S. Government agency securities $ 1,249 $ — $ 1,249 $ — Municipal securities 12,373 — 12,373 — Mortgage-backed securities 36,187 — 36,187 — Total $ 49,809 $ — $ 49,809 $ —
Scheduled Maturities of Securities with Fair Value and Amortized Cost	The scheduled maturities of securities are as follows: At June 30, 2018 Amortized Fair Value (in thousands) Due in less than one year $ 502 $ 503 Due in one to five years 3,672 3,638 Due in five to ten years 6,378 6,388 Due after ten years 2,727 2,623 Mortgage-backed securities 34,612 33,505 Total $ 47,891 $ 46,657

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Composition of Company's Loan Portfolio, Excluding Loans Held for Sale	The composition of the Company’s loan portfolio, excluding loans held for sale, was the following for the periods presented below: (in thousands) At June 30, At December 31, Real estate mortgage loans: Commercial $ 89,482 $ 79,565 Residential and home equity 113,715 94,824 Construction 32,266 26,813 Total real estate mortgage loans 235,463 201,202 Commercial loans 46,006 44,027 Consumer and other loans 7,136 7,742 Total loans 288,605 252,971 Add (deduct): Net deferred loan costs 409 424 Allowance for loan losses (3,541 ) (3,136 ) Loans, net $ 285,473 $ 250,259
Summary of Changes in Allowance for Loan Losses	An analysis of the change in allowance for loan losses follows: Real Estate Mortgage Loans (in thousands) Commercial Residential Construction Commercial Consumer Total Three-Month Period Ended June 30, 2018 Beginning balance $ 977 $ 1,208 $ 372 $ 745 $ 83 $ 3,385 Provision for loan losses 24 101 28 2 — 155 Net (charge-offs) recoveries — — — 2 (1 ) 1 Ending balance $ 1,001 $ 1,309 $ 400 $ 749 $ 82 $ 3,541 Three-Month Period Ended June 30, 2017 Beginning balance $ 767 $ 1,086 $ 293 $ 704 $ 58 $ 2,908 Provision for loan losses 44 22 45 6 3 120 Net (charge-offs) recoveries — — — 2 (2 ) — Ending balance $ 811 $ 1,108 $ 338 $ 712 $ 59 $ 3,028 Six-Month Beginning balance $ 894 $ 1,097 $ 331 $ 724 $ 90 $ 3,136 Provision (credit) for loan losses 107 212 69 22 (1 ) 409 Net (charge-offs) recoveries — — — 3 (7 ) (4 ) Ending balance $ 1,001 $ 1,309 $ 400 $ 749 $ 82 $ 3,541 Six-Month Beginning balance $ 775 $ 1,074 $ 258 $ 714 $ 55 $ 2,876 Provision (credit) for loan losses 36 34 80 (4 ) 9 155 Net (charge-offs) recoveries — — — 2 (5 ) (3 ) Ending balance $ 811 $ 1,108 $ 338 $ 712 $ 59 $ 3,028 At June 30, 2018 Individually evaluated for impairment: Recorded investment $ 611 $ 240 $ — $ 133 $ — $ 984 Balance in allowance for loan losses $ — $ — $ — $ 133 $ — $ 133 Collectively evaluated for impairment: Recorded investment $ 88,871 $ 113,475 $ 32,266 $ 45,873 $ 7,136 $ 287,621 Balance in allowance for loan losses $ 1,001 $ 1,309 $ 400 $ 616 $ 82 $ 3,408 At December 31, 2017 Individually evaluated for impairment: Recorded investment $ — $ — $ — $ 134 $ — $ 134 Balance in allowance for loan losses $ — $ — $ — $ 134 $ — $ 134 Collectively evaluated for impairment: Recorded investment $ 79,565 $ 94,824 $ 26,813 $ 43,893 $ 7,742 $ 252,837 Balance in allowance for loan losses $ 894 $ 1,097 $ 331 $ 590 $ 90 $ 3,002
Summary of Loan Credit Quality	The following summarizes the loan credit quality: Real Estate Mortgage Loans (in thousands) Commercial Residential and Home Equity Construction Commercial Loans Consumer and Other Loans Total At June 30, 2018 Grade: Pass $ 84,019 $ 110,717 $ 32,101 $ 43,994 $ 7,041 $ 277,872 Special mention 4,852 2,835 — 1,235 95 9,017 Substandard 611 163 165 777 — 1,716 Doubtful — — — — — — Loss — — — — — — Total $ 89,482 $ 113,715 $ 32,266 $ 46,006 $ 7,136 $ 288,605 At December 31, 2017 Grade: Pass $ 74,560 $ 92,282 $ 26,356 $ 42,874 $ 7,715 $ 243,787 Special mention 4,382 2,122 298 591 27 7,420 Substandard 623 420 159 562 — 1,764 Doubtful — — — — — — Loss — — — — — — Total $ 79,565 $ 94,824 $ 26,813 $ 44,027 $ 7,742 $ 252,971
Summary of Past Due Loans	Age analysis of past due loans is as follows: Accruing Loans (in thousands) 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days Past Due Total Past Due Current Nonaccrual Loans Total Loans At June 30, 2018: Real estate mortgage loans: Commercial $ 42 $ 300 $ — $ 342 $ 89,140 $ — $ 89,482 Residential and home equity 215 — — 215 113,500 — 113,715 Construction — — — — 32,266 — 32,266 Commercial loans — — — — 45,916 90 46,006 Consumer and other loans — — — — 7,136 — 7,136 Total $ 257 $ 300 $ — $ 557 $ 287,958 $ 90 $ 288,605 At December 31, 2017: Real estate mortgage loans: Commercial $ — $ 623 $ — $ 623 $ 78,942 $ — $ 79,565 Residential and home equity — 255 — 255 94,569 — 94,824 Construction — — — — 26,813 — 26,813 Commercial loans — — — — 43,893 134 44,027 Consumer and other loans — — — — 7,742 — 7,742 Total $ — $ 878 $ — $ 878 $ 251,959 $ 134 $ 252,971
Summary of Impaired Loans	The following summarizes the amount of impaired loans: With No Related Allowance Recorded With an Allowance Recorded Total (in thousands) Recorded Investment Unpaid Contractual Principal Balance Recorded Investment Unpaid Contractual Principal Balance Related Allowance Recorded Investment Unpaid Contractual Principal Balance Related Allowance At June 30, 2018: Real estate mortgage loans: Commercial $ 611 $ 611 $ — $ — $ — $ 611 $ 611 $ — Residential & home equity 240 240 — — — 240 240 — Commercial loans — — 133 133 133 133 133 133 Total $ 851 $ 851 $ 133 $ 133 $ 133 $ 984 $ 984 $ 133 At December 31, 2017: Commercial loans $ — $ — $ 134 $ 134 $ 134 $ 134 $ 134 $ 134 Total $ — $ — $ 134 $ 134 $ 134 $ 134 $ 134 $ 134
Summary of Average Net Investment in Impaired Loans and Interest Income Recognized and Received on Impaired Loans	The average net investment in impaired loans and interest income recognized and received on impaired loans are as follows: Three Months Ended June 30, 2018 2017 (in thousands) Average Recorded Investment Interest Income Recognized Interest Income Received Average Recorded Investment Interest Income Recognized Interest Income Received Real estate mortgage loans: Commercial $ 611 $ — $ — $ — $ — $ — Residential & home equity 251 1 — 481 22 27 Construction — — — 74 — — Commercial loans 156 — — 67 — 1 Total $ 1,018 $ 1 $ — $ 622 $ 22 $ 28 Six Months Ended June 30, 2018 2017 (in thousands) Average Interest Interest Average Interest Interest Real estate mortgage loans: Commercial $ 328 $ — $ — $ — $ — $ — Residential & home equity 212 1 — 562 22 28 Construction — — 2 74 — — Commercial loans 152 — — 69 — 1 Total $ 692 $ 1 $ 2 $ 705 $ 22 $ 29
Summary of Loans Determined to be Troubled Debt Restructurings	The Company entered into one new TDR during the quarter ended June 30, 2018 and during the six months ended June 30, 2018 and 2017. The Company had no new TDRs during the quarter ended June 30, 2017. Three Months Ended June 30, 2018 2017 ( dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Current Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Current Modification Outstanding Recorded Investment Troubled Debt Restructurings - Commercial real estate: Modified principal 1 $ 619 $ 611 $ 611 — $ — $ — $ — Total 1 $ 619 $ 611 $ 611 — $ — $ — $ — Six Months Ended June 30, 2018 2017 (dollars in thousands) Number of Contracts Pre- Post- Current Number of Contracts Pre- Post- Current Troubled Debt Restructurings - Commercial real estate: Modified principal 1 $ 619 $ 611 $ 611 $ 1 $ 153 $ 169 $ 167 Total 1 $ 619 $ 611 $ 611 $ 1 $ 153 $ 169 $ 167

Regulatory Capital (Tables)

Regulatory Capital (Tables)	6 Months Ended
	Jun. 30, 2018
Banking and Thrift [Abstract]
Summary of Regulatory Capital Requirements and Bank's Capital Position	The Bank’s actual capital amounts and percentages are also presented in the following table. Actual For Capital Adequacy For Well Capitalized (dollars in thousands) Amount Percentage Amount Percentage Amount Percentage As of June 30, 2018 Tier 1 Leverage Capital $ 35,213 9.68 % $ 14,554 4.00 % $ 18,192 5.00 % Common Equity Tier 1 Risk-based Capital 35,213 12.28 12,905 4.50 18,641 6.50 Tier 1 Risk-based Capital 35,213 12.28 17,207 6.00 22,942 8.00 Total Risk-based Capital 38,754 13.51 22,942 8.00 28,678 10.00 As of December 31, 2017 Tier 1 Leverage Capital $ 33,146 9.48 % $ 13,983 4.00 % $ 17,479 5.00 % Common Equity Tier 1 Risk-based Capital 33,146 12.80 11,654 4.50 16,834 6.50 Tier 1 Risk-based Capital 33,146 12.80 15,539 6.00 20,718 8.00 Total Risk-based Capital 36,282 14.01 20,718 8.00 25,898 10.00

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Common Share	For the three and six months ended June 30, 2018 and 2017, outstanding stock options are considered dilutive securities for purposes of calculating diluted EPS which was computed using the treasury stock method. 2018 2017 Weighted- Per Weighted- Per Average Share Average Share (dollars in thousands, except per share amounts) Earnings Shares Amount Earnings Shares Amount Three Months Ending June 30: Basic EPS: Net earnings $ 1,002 3,123,594 $ 0.32 $ 765 2,589,921 $ 0.30 Effect of dilutive securities-incremental shares from assumed conversion of options 2,428 2,977 Diluted EPS: Net earnings $ 1,002 3,126,022 $ 0.32 $ 765 2,592,898 $ 0.30 Six Months Ending June 30: Basic EPS: Net earnings $ 1,756 3,122,112 $ 0.56 $ 1,301 2,299,508 $ 0.57 Effect of dilutive securities-incremental shares from assumed conversion of options 5,375 6,261 Diluted EPS: Net earnings $ 1,756 3,127,487 $ 0.56 $ 1,301 2,305,769 $ 0.57

Stock Option Plans (Tables)

Stock Option Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Black-Scholes Option-Pricing Model Assumptions	The fair value of each option granted during the six months ended June 30, 2018 was estimated on the date of grant using the Black-Scholes option-pricing model with the following range of assumptions: Weighted average risk-free interest rate 1.47 - 2.63 % Expected dividend yield 0.41 - 0.50 % Expected stock volatility 10.70 - 11.90 % Expected life in years 2.5 - 6.5 Per share fair value of options issued during period $ 1.49 - $3.35
2015 Stock Incentive Compensation Plan [Member]
Summary of Company's Plan	Number Weighted- Weighted- Aggregate Outstanding at December 31, 2016 — $ — Options granted 11,540 17.03 Outstanding at June 30, 2017 11,540 $ 17.03 Outstanding at December 31, 2017 11,540 $ 17.03 Options granted 252,917 19.79 Outstanding at June 30, 2018 264,457 $ 19.79 8.85 years $ 311,000 Exercisable at June 30, 2018 37,207 $ 17.93 3.31 years $ 113,000
2007 Incentive Award Plan [Member]
Summary of Company's Plan	A summary of the activity in the Company’s 2007 Stock Option Plan is as follows: Weighted- Weighted- Average Average Remaining Aggregate Number of Exercise Contractual Intrinsic Options Price Term Value Outstanding at December 31, 2016 42,200 $ 10.16 Options exercised (500 ) 10.00 Options forfeited (200 ) 10.00 Outstanding at June 30, 2017 41,500 $ 10.16 Options exercised (18,950 ) $ 10.00 Options forfeited (350 ) $ 10.00 Outstanding at December 31, 2017 22,200 $ 10.31 Options exercised (4,700 ) 10.00 Outstanding at June 30, 2018 17,500 $ 10.39 1.26 years $ 185,000 Exercisable at June 30, 2018 17,500 $ 10.39 1.26 years $ 185,000

Fair Value of Financial Instr25

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Values and Fair Value Measurement Method of Financial Instruments	The estimated fair values and fair value measurement method with respect to the Company’s financial instruments were as follows: At June 30, 2018 At December 31, 2017 Carrying Fair Carrying Fair (in thousands) Level Amount Value Amount Value Financial assets: Cash and cash equivalents 1 $ 32,429 $ 32,429 $ 32,397 $ 32,397 Securities available for sale 2 46,657 46,657 49,809 49,809 Loans held for sale 3 7,321 7,354 5,880 6,039 Loans, net 3 285,473 283,741 250,259 249,628 Federal Home Loan Bank stock 3 355 355 316 316 Accrued interest receivable 3 1,027 1,027 978 978 Financial liabilities- Deposits 3 331,823 332,010 298,297 298,403 Off-Balance 3 — — — —

Off-Balance Sheet Financial I26

Off-Balance Sheet Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Text Block [Abstract]
Summary of Off-Balance Sheet Financial Instruments	The maximum potential amount of future payments we could be required to make for off-balance (in thousands) At June 30, 2018 Commitments to extend credit $ 3,007 Construction loans in process $ 16,459 Unused lines of credit $ 39,585 Standby letters of credit $ 1,894 Standby performance letters of credit $ 378 Guaranteed accounts $ 1,328

Premises and Equipment (Tables)

Premises and Equipment (Tables)	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Summary of New Rent Obligations	The new rent obligations will commence 120 days after the Delivery Date (the “Rent Commencement Date”) and are as follows: Years Annual Rent Amount 1-5 $ 294,000 6-10 $ 323,400 11-15 $ 355,740

General - Additional Informatio

General - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018Office
Accounting Policies [Abstract]
Percent of outstanding common stock owns	100.00%
Number of banking offices	3
Statutory federal income tax rate	21.00%

Securities Available for Sale -

Securities Available for Sale - Summary of Carrying Amount and Fair Values of Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 47,891	$ 50,205
Gross Unrealized Gains	76	157
Gross Unrealized Losses	(1,310)	(553)
Fair Value	46,657	49,809
US Government Agency Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,075	1,251
Gross Unrealized Gains		6
Gross Unrealized Losses	(24)	(8)
Fair Value	1,051	1,249
Municipal Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,204	12,340
Gross Unrealized Gains	58	128
Gross Unrealized Losses	(161)	(95)
Fair Value	12,101	12,373
Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34,612	36,614
Gross Unrealized Gains	18	23
Gross Unrealized Losses	(1,125)	(450)
Fair Value	$ 33,505	$ 36,187

Securities Available for Sale30

Securities Available for Sale - Schedule of Sale of Securities Available for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of securities				$ 750
Gross gains	$ 0	$ 0	$ 0	0
Gross losses				(1)
Net loss on sale of securities				$ (1)

Securities Available for Sale31

Securities Available for Sale - Summary of Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ (870)	$ (352)
Fair Value, Less Than Twelve Months	29,903	32,267
Gross Unrealized Losses, Over Twelve Months	(440)	(201)
Fair Value, Over Twelve Months	10,799	6,870
US Government Agency Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	(24)	(8)
Fair Value, Less Than Twelve Months	1,051	694
Municipal Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	(93)	(36)
Fair Value, Less Than Twelve Months	4,421	1,831
Gross Unrealized Losses, Over Twelve Months	(68)	(59)
Fair Value, Over Twelve Months	2,369	1,203
Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	(753)	(308)
Fair Value, Less Than Twelve Months	24,431	29,742
Gross Unrealized Losses, Over Twelve Months	(372)	(142)
Fair Value, Over Twelve Months	$ 8,430	$ 5,667

Securities Available for Sale32

Securities Available for Sale - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2018Securities	Dec. 31, 2017Securities
Investments, Debt and Equity Securities [Abstract]
Number of securities in unrealized loss | Securities			40	34
Securities transferred in or out of Level 1, Level 2 or Level 3 | $	$ 0	$ 0

Securities Available for Sale33

Securities Available for Sale - Securities Available for Sale Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 46,657	$ 49,809
US Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,051	1,249
Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	12,101	12,373
Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	33,505	36,187
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	46,657	49,809
Level 2 [Member] | US Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,051	1,249
Level 2 [Member] | Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	12,101	12,373
Level 2 [Member] | Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 33,505	$ 36,187

Securities Available for Sale34

Securities Available for Sale - Scheduled Maturities of Securities with Fair Value and Amortized Cost (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Due in less than one year, Amortized cost	$ 502
Due in one to five years, Amortized cost	3,672
Due in five to ten year, Amortized cost	6,378
Due after ten years, Amortized cost	2,727
Mortgage-backed securities, Amortized cost	34,612
Amortized Cost	47,891	$ 50,205
Due in less than one year, Fair value	503
Due in one to five years, Fair value	3,638
Due in five to ten year, Fair value	6,388
Due after ten years, Fair value	2,623
Mortgage-backed securities, Fair value	33,505
Total	$ 46,657	$ 49,809

Loans - Composition of Company'

Loans - Composition of Company's Loan Portfolio, Excluding Loans Held for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 288,605		$ 252,971
Net deferred loan costs	409		424
Allowance for loan losses	(3,541)	$ (3,385)	(3,136)	$ (3,028)	$ (2,908)	$ (2,876)
Loans, net	285,473		250,259
Mortgage Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	235,463		201,202
Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	89,482		79,565
Allowance for loan losses	(1,001)	(977)	(894)	(811)	(767)	(775)
Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	113,715		94,824
Allowance for loan losses	(1,309)	(1,208)	(1,097)	(1,108)	(1,086)	(1,074)
Mortgage Receivable [Member] | Construction Real Estate Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,266		26,813
Allowance for loan losses	(400)	(372)	(331)	(338)	(293)	(258)
Loans and Finance Receivables [Member] | Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	46,006		44,027
Allowance for loan losses	(749)	(745)	(724)	(712)	(704)	(714)
Loans and Finance Receivables [Member] | Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,136		7,742
Allowance for loan losses	$ (82)	$ (83)	$ (90)	$ (59)	$ (58)	$ (55)

Loans - Summary of Changes in A

Loans - Summary of Changes in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 3,385	$ 2,908	$ 3,136	$ 2,876
Provision (credit) for loan losses	155	120	409	155
Net (charge-offs) recoveries	1		(4)	(3)
Ending balance	3,541	3,028	3,541	3,028
Individually evaluated for impairment:
Recorded investment	984		984		$ 134
Balance in allowance for loan losses	133		133		134
Collectively evaluated for impairment:
Recorded investment	287,621		287,621		252,837
Balance in allowance for loan losses	3,408		3,408		3,002
Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	977	767	894	775
Provision (credit) for loan losses	24	44	107	36
Ending balance	1,001	811	1,001	811
Individually evaluated for impairment:
Recorded investment	611		611
Collectively evaluated for impairment:
Recorded investment	88,871		88,871		79,565
Balance in allowance for loan losses	1,001		1,001		894
Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,208	1,086	1,097	1,074
Provision (credit) for loan losses	101	22	212	34
Ending balance	1,309	1,108	1,309	1,108
Individually evaluated for impairment:
Recorded investment	240		240
Collectively evaluated for impairment:
Recorded investment	113,475		113,475		94,824
Balance in allowance for loan losses	1,309		1,309		1,097
Mortgage Receivable [Member] | Construction Real Estate Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	372	293	331	258
Provision (credit) for loan losses	28	45	69	80
Ending balance	400	338	400	338
Collectively evaluated for impairment:
Recorded investment	32,266		32,266		26,813
Balance in allowance for loan losses	400		400		331
Loans and Finance Receivables [Member] | Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	745	704	724	714
Provision (credit) for loan losses	2	6	22	(4)
Net (charge-offs) recoveries	2	2	3	2
Ending balance	749	712	749	712
Individually evaluated for impairment:
Recorded investment	133		133		134
Balance in allowance for loan losses	133		133		134
Collectively evaluated for impairment:
Recorded investment	45,873		45,873		43,893
Balance in allowance for loan losses	616		616		590
Loans and Finance Receivables [Member] | Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	83	58	90	55
Provision (credit) for loan losses		3	(1)	9
Net (charge-offs) recoveries	(1)	(2)	(7)	(5)
Ending balance	82	$ 59	82	$ 59
Collectively evaluated for impairment:
Recorded investment	7,136		7,136		7,742
Balance in allowance for loan losses	$ 82		$ 82		$ 90

Loans - Additional Information

Loans - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)SecurityLoanClassContracts	Jun. 30, 2017USD ($)Contracts	Jun. 30, 2018USD ($)SecurityLoanClassContractsSegment	Jun. 30, 2017USD ($)Contracts	Dec. 31, 2017USD ($)
Financing Receivable, Impaired [Line Items]
Number of loan portfolio | Segment			3
Number of loan portfolio class | Class	5		5
Financing receivable, recorded investment, nonaccrual status | SecurityLoan	2		2
Nonaccrual loan	$ 90,000		$ 90,000		$ 134,000
Impaired Loans [Member] | Collateral Pledged [Member]
Financing Receivable, Impaired [Line Items]
Loans measured at fair value on a nonrecurring basis	$ 0	$ 0	0	$ 0
Minimum [Member]
Financing Receivable, Impaired [Line Items]
Impairment valuation loan limit			$ 500,000
Minimum [Member] | Loans Receivable [Member]
Financing Receivable, Impaired [Line Items]
Maturity period of loan			1 year
Maximum [Member] | Loans Receivable [Member]
Financing Receivable, Impaired [Line Items]
Maturity period of loan			10 years
Real Estate Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Number of loan portfolio class | Class	3		3
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Description of interest rate of loans			Equipment loans generally have a term of five years or less and may have a fixed or variable rate
Commercial Loans [Member] | Period 1 [Member]
Financing Receivable, Impaired [Line Items]
Period of portfolio mortgage adjustable rate			1 year
Period of secondary market mortgage fixed rate			15 years
Commercial Loans [Member] | Period 2 [Member]
Financing Receivable, Impaired [Line Items]
Period of portfolio mortgage adjustable rate			3 years
Period of secondary market mortgage fixed rate			30 years
Commercial Loans [Member] | Period 3 [Member]
Financing Receivable, Impaired [Line Items]
Period of portfolio mortgage adjustable rate			5 years
Commercial Loans [Member] | Period 4 [Member]
Financing Receivable, Impaired [Line Items]
Period of portfolio mortgage adjustable rate			7 years
Commercial Loans [Member] | Minimum [Member]
Financing Receivable, Impaired [Line Items]
Maturity period of loan			3 years
Commercial Loans [Member] | Maximum [Member]
Financing Receivable, Impaired [Line Items]
Maturity period of loan			5 years
Construction Real Estate Mortgage Loans [Member] | Minimum [Member]
Financing Receivable, Impaired [Line Items]
Maturity period of loan			1 year
Construction Real Estate Mortgage Loans [Member] | Maximum [Member]
Financing Receivable, Impaired [Line Items]
Maturity period of loan			2 years
Troubled Debt Restructurings [Member]
Financing Receivable, Impaired [Line Items]
Number of loans | Contracts	1	0	0	0
Loans identified as TDRs	$ 655,000		$ 655,000

Loans - Summary of Loan Credit

Loans - Summary of Loan Credit Quality (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 288,605	$ 252,971
Mortgage Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	235,463	201,202
Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	89,482	79,565
Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	113,715	94,824
Mortgage Receivable [Member] | Construction Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	32,266	26,813
Loans and Finance Receivables [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	46,006	44,027
Loans and Finance Receivables [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	7,136	7,742
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	277,872	243,787
Pass [Member] | Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	84,019	74,560
Pass [Member] | Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	110,717	92,282
Pass [Member] | Mortgage Receivable [Member] | Construction Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	32,101	26,356
Pass [Member] | Loans and Finance Receivables [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	43,994	42,874
Pass [Member] | Loans and Finance Receivables [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	7,041	7,715
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	9,017	7,420
Special Mention [Member] | Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	4,852	4,382
Special Mention [Member] | Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,835	2,122
Special Mention [Member] | Mortgage Receivable [Member] | Construction Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality		298
Special Mention [Member] | Loans and Finance Receivables [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,235	591
Special Mention [Member] | Loans and Finance Receivables [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	95	27
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,716	1,764
Substandard [Member] | Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	611	623
Substandard [Member] | Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	163	420
Substandard [Member] | Mortgage Receivable [Member] | Construction Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	165	159
Substandard [Member] | Loans and Finance Receivables [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 777	$ 562

Loans - Summary of Past Due Loa

Loans - Summary of Past Due Loans (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due	$ 557,000	$ 878,000
Current	287,958,000	251,959,000
Nonaccrual Loans	90,000	134,000
Total Loans	288,605,000	252,971,000
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due	257,000
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due	300,000	878,000
Mortgage Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	235,463,000	201,202,000
Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due	342,000	623,000
Current	89,140,000	78,942,000
Total Loans	89,482,000	79,565,000
Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due	42,000
Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due	300,000	623,000
Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due	215,000	255,000
Current	113,500,000	94,569,000
Total Loans	113,715,000	94,824,000
Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due	215,000
Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans Total Past Due		255,000
Mortgage Receivable [Member] | Construction Real Estate Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	32,266,000	26,813,000
Total Loans	32,266,000	26,813,000
Loans and Finance Receivables [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	45,916,000	43,893,000
Nonaccrual Loans	90,000	134,000
Total Loans	46,006,000	44,027,000
Loans and Finance Receivables [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,136,000	7,742,000
Total Loans	$ 7,136,000	$ 7,742,000

Loans - Summary of Impaired Loa

Loans - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
With No Related Allowance Recorded Investment	$ 851
With No Related Allowance Unpaid Contractual Principal Balance	851
With an Allowance Recorded Investment	133	$ 134
With an Allowance Recorded Unpaid Contractual Principal Balance	133	134
With an Allowance Recorded Related Allowance	133	134
Recorded Investment	984	134
Unpaid Contractual Principal Balance	984	134
Related Allowance	133	134
Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
With No Related Allowance Recorded Investment	611
With No Related Allowance Unpaid Contractual Principal Balance	611
Recorded Investment	611
Unpaid Contractual Principal Balance	611
Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
With No Related Allowance Recorded Investment	240
With No Related Allowance Unpaid Contractual Principal Balance	240
Recorded Investment	240
Unpaid Contractual Principal Balance	240
Loans and Finance Receivables [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Investment	133	134
With an Allowance Recorded Unpaid Contractual Principal Balance	133	134
With an Allowance Recorded Related Allowance	133	134
Recorded Investment	133	134
Unpaid Contractual Principal Balance	133	134
Related Allowance	$ 133	$ 134

Loans - Summary of Average Net

Loans - Summary of Average Net Investment in Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 1,018	$ 622	$ 692	$ 705
Interest Income Recognized	1	22	1	22
Interest Income Received		28	2	29
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			152	69
Interest Income Received				1
Mortgage Receivable [Member] | Residential and Home Equity Real Estate Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	251	481	212	562
Interest Income Recognized	1	22	1	22
Interest Income Received		27		28
Mortgage Receivable [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			328
Mortgage Receivable [Member] | Construction Real Estate Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		74		$ 74
Interest Income Received			$ 2
Mortgage Receivable [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	156	67
Interest Income Received		$ 1
Loans and Finance Receivables [Member] | Commercial Real Estate Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 611

Loans - Summary of Loans Determ

Loans - Summary of Loans Determined to be Troubled Debt Restructurings (Detail) - Commercial Real Estate Mortgage Loans [Member] $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018USD ($)Contracts	Jun. 30, 2018USD ($)Contracts	Jun. 30, 2017USD ($)Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 619	$ 619	$ 153
Post-Modification Outstanding Recorded Investment	611	611	169
Current Modification Outstanding Recorded Investment	$ 611	$ 611	$ 167
Modified Principal [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 619	$ 619	$ 153
Post-Modification Outstanding Recorded Investment	611	611	169
Current Modification Outstanding Recorded Investment	$ 611	$ 611	$ 167

Regulatory Capital - Additional

Regulatory Capital - Additional Information (Detail)	Jan. 01, 2019	Jun. 30, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Percentage of capital conservation buffer minimum risk-based capital requirement		1.875%
Scenario, Forecast [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer required	2.50%

Regulatory Capital - Summary of

Regulatory Capital - Summary of Regulatory Capital Requirements and Bank's Capital Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Tier 1 Leverage Capital, Actual amount	$ 35,213	$ 33,146
Tier 1 Leverage Capital Ratio, Actual Percentage	9.68%	9.48%
Tier 1 Leverage Capital, For Capital Adequacy Purposes, Amount	$ 14,554	$ 13,983
Tier 1 Leverage Capital Ratio, For Capital Adequacy Purposes, Percentage	4.00%	4.00%
Tier 1 Leverage Capital, For Well Capitalized Purposes, Amount	$ 18,192	$ 17,479
Tier 1 Leverage Capital Ratio, For Well Capitalized Purposes, Percentage	5.00%	5.00%
Common Equity Tier 1 Risk-Based Capital Ratio, Actual Amount	$ 35,213	$ 33,146
Common Equity Tier 1 Risk-Based Capital Ratio, Actual Percentage	12.28%	12.80%
Common Equity Tier 1 Risk-Based Capital Ratio, For Capital Adequacy Purposes, Amount	$ 12,905	$ 11,654
Common Equity Tier 1 Risk-Based Capital Ratio, For Capital Adequacy Purposes, Percentage	4.50%	4.50%
Common Equity Tier 1 Risk-Based Capital Ratio, For Well Capitalized Purposes, Amount	$ 18,641	$ 16,834
Common Equity Tier 1 Risk-Based Capital Ratio, For Well Capitalized Purposes, Percentage	6.50%	6.50%
Tier 1 Risk-Based Capital, Actual Amount	$ 35,213	$ 33,146
Tier 1 Risk-Based Capital Ratio, Actual Percentage	12.28%	12.80%
Tier 1 Risk-Based Capital, For Capital Adequacy Purposes, Amount	$ 17,207	$ 15,539
Tier 1 Risk-Based Capital Ratio, For Capital Adequacy Purposes, Percentage	6.00%	6.00%
Tier 1 Risk-Based Capital, For Well Capitalized Purposes, Amount	$ 22,942	$ 20,718
Common Equity Tier 1 Risk-Based Capital Ratio, For Well Capitalized Purposes, Percentage	8.00%	8.00%
Total Risk-Based Capital, Actual Amount	$ 38,754	$ 36,282
Total Risk-Based Capital Ratio, Actual Percentage	13.51%	14.01%
Total Risk-Based Capital, For Capital Adequacy Purposes, Amount	$ 22,942	$ 20,718
Total Risk-Based Capital Ratio, For Capital Adequacy Purposes, Percentage	8.00%	8.00%
Total Risk-Based Capital, For Well Capitalized Purposes, Amount	$ 28,678	$ 25,898
Total Risk-Based Capital Ratio, For Well Capitalized Purposes, Percentage	10.00%	10.00%

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings	$ 1,002	$ 765	$ 1,756	$ 1,301
Earnings	$ 1,002	$ 765	$ 1,756	$ 1,301
Weighted-Average Shares	3,123,594	2,589,921	3,122,112	2,299,508
Effect of dilutive securities-incremental shares from assumed conversion of options	2,428	2,977	5,375	6,261
Weighted-Average Shares	3,126,022	2,592,898	3,127,487	2,305,769
Per Share Amount	$ 0.32	$ 0.30	$ 0.56	$ 0.57
Per Share Amount	$ 0.32	$ 0.30	$ 0.56	$ 0.57

Stock Option Plans - Additional

Stock Option Plans - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 64,000	$ 15,000
Common stock issued as compensation to directors, value		$ 34,000	$ 35,000
Non Qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Options vesting period	5 years
Non qualified stock options beginning date	Apr. 1, 2024
Non qualified stock options ending date	Apr. 1, 2028
Non Qualified Stock Options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Options issued	120,000
Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Options vesting period	5 years
Incentive Stock Options [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Options issued	92,250
Incentive Stock Options [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Options issued	25,000
2015 Stock Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		252,917	11,540
2015 Stock Incentive Compensation Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares to be issued under stock option plan	500,000	500,000
Number of shares issued under stock option plan		0
Maximum percentage of shares issued		15.00%
Unrecognized compensation expense related to nonvested share-based compensation arrangements granted	$ 732,000	$ 732,000	$ 0
Remaining life		56 months
Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares to be issued under stock option plan	74,805	74,805
Shares granted		1,556	2,165
Shares available for grant	56,546	56,546
Stock consideration on percentage of common stock received upon cash fees	110.00%	110.00%
Common stock issued as compensation to directors, value		$ 34,000	$ 35,000
2015 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	252,917
Shares available for grant	204,328	204,328

Stock Option Plans - Summary of

Stock Option Plans - Summary of Company's Plan (Detail) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
2015 Stock Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding beginning balance	11,540
Number of Options, granted	252,917	11,540
Number of Options, Outstanding ending balance	264,457	11,540	11,540
Number of Options, Exercisable ending balance	37,207
Weighted-Average Exercise Price, Outstanding beginning balance	$ 17.03
Weighted-Average Exercise Price, Options granted	19.79	$ 17.03
Weighted-Average Exercise Price, Outstanding ending balance	19.79	$ 17.03	$ 17.03
Weighted-Average Exercise Price, Exercisable	$ 17.93
Weighted-Average Remaining Contractual Term, Outstanding	8 years 10 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable	3 years 3 months 22 days
Aggregate Intrinsic Value, Outstanding	$ 311,000
Aggregate Intrinsic Value, Exercisable	$ 113,000
2007 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding beginning balance	22,200	42,200	42,200
Number of Options, exercised	(4,700)	(500)	(18,950)
Number of Options, forfeited		(200)	(350)
Number of Options, Outstanding ending balance	17,500	41,500	22,200
Number of Options, Exercisable ending balance	17,500
Weighted-Average Exercise Price, Outstanding beginning balance	$ 10.31	$ 10.16	$ 10.16
Weighted-Average Exercise Price, Options exercised	10	10	10
Weighted-Average Exercise Price, Options forfeited		10	10
Weighted-Average Exercise Price, Outstanding ending balance	10.39	$ 10.16	$ 10.31
Weighted-Average Exercise Price, Exercisable	$ 10.39
Weighted-Average Remaining Contractual Term, Outstanding	1 year 3 months 4 days
Weighted-Average Remaining Contractual Term, Exercisable	1 year 3 months 4 days
Aggregate Intrinsic Value, Outstanding	$ 185,000
Aggregate Intrinsic Value, Exercisable	$ 185,000

Stock Option Plans - Black-Scho

Stock Option Plans - Black-Scholes Option-Pricing Model Assumptions (Detail)	6 Months Ended
	Jun. 30, 2018$ / shares
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average risk-free interest rate	1.47%
Expected dividend yield	0.41%
Expected stock volatility	10.70%
Expected life in years	2 years 6 months
Per share fair value of options issued during period	$ 1.49
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average risk-free interest rate	2.63%
Expected dividend yield	0.50%
Expected stock volatility	11.90%
Expected life in years	6 years 6 months
Per share fair value of options issued during period	$ 3.35

Federal Home Loan Bank Advanc49

Federal Home Loan Bank Advances - Additional Information (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Advances from Federal Home Loan Banks [Abstract]
Maximum borrowing capacity under FHLB	$ 37,100,000
Outstanding advances under FHLB	$ 0	$ 0

Fair Value of Financial Instr50

Fair Value of Financial Instruments - Schedule of Estimated Fair Values and Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 32,429	$ 32,397
Securities available for sale	46,657	49,809
Loans held for sale	7,321	5,880
Loans, net	285,473	250,259
Federal Home Loan Bank stock	355	316
Accrued interest receivable	1,027	978
Deposits	331,823	298,297
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	46,657	49,809
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	32,429	32,397
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	46,657	49,809
Estimated Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	7,354	6,039
Loans, net	283,741	249,628
Federal Home Loan Bank stock	355	316
Accrued interest receivable	1,027	978
Deposits	332,010	298,403
Off Balance Sheet Items	0	0
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	32,429	32,397
Securities available for sale	46,657	49,809
Loans held for sale	7,321	5,880
Loans, net	285,473	250,259
Federal Home Loan Bank stock	355	316
Accrued interest receivable	1,027	978
Deposits	331,823	298,297
Off Balance Sheet Items	$ 0	$ 0

Off-Balance Sheet Financial I51

Off-Balance Sheet Financial Instruments - Additional Information (Detail) - Standby Financial Letters of Credit [Member]	6 Months Ended
	Jun. 30, 2018USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Debt instrument maturity period	1 year
Collateral amount	$ 565,000
Credit Availability Concentration Risk [Member] | Swap Liabilities [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Percentage of additional credit limit guaranteed	10.00%

Off-Balance Sheet Financial I52

Off-Balance Sheet Financial Instruments - Summary of Off-Balance Sheet Financial Instruments (Detail)	6 Months Ended
	Jun. 30, 2018USD ($)
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with off-balance-sheet risk	$ 3,007,000
Construction Loans in Process [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with off-balance-sheet risk	16,459,000
Unused Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with off-balance-sheet risk	39,585,000
Standby Financial Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with off-balance-sheet risk	1,894,000
Performance Stand By Letters Of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with off-balance-sheet risk	378,000
Guaranteed Accounts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with off-balance-sheet risk	$ 1,328,000

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018	Aug. 06, 2018
Lease Rental Expenses [Line Items]
Lease option to extend, description	The term of the Lease is 15 years, with four options to renew for five years each.
Lease initial setting up period	6 months
Anticipated rent commencement	120 days
Subsequent Event [Member]
Lease Rental Expenses [Line Items]
Lease initial term		15 years

Premises and Equipment - Summar

Premises and Equipment - Summary of New Rent Obligations (Detail)	Jun. 30, 2018USD ($)
Lease Rental Expenses [Line Items]
Annual Rent Amount	$ 355,740
One To Five Years [Member]
Lease Rental Expenses [Line Items]
Annual Rent Amount	294,000
Six To Ten Years [Member]
Lease Rental Expenses [Line Items]
Annual Rent Amount	$ 323,400