Consolidated Statements of Income (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Interest and Dividend Income:
Interest and fees on loans											$ 7,562	$ 6,352	$ 17,332			$ 12,985
Securities available-for-sale											2,026	2,102	3,058			4,285
Federal Reserve Bank dividends											19		67
Trust preferred securities											1	1	3			3
Interest on deposits with banks											1	4	1			4
Total interest and dividend income	$ 5,573	$ 5,154	$ 5,015	$ 4,724	$ 4,906	$ 4,703	$ 4,502	$ 4,321	$ 4,317	$ 4,141	9,609	8,459	20,466			17,281
INTEREST EXPENSE:
Deposits											677	633	1,457			1,294
Federal Home Loan Bank advances and other borrowings											310	365	550			664
Subordinated debentures											43	43	448			87
Total interest expense	707	721	526	501	515	515	503	502	516	524	1,030	1,041	2,455			2,045
Net Interest Income	4,866	4,433	4,489	4,223	4,391	4,188	3,999	3,819	3,801	3,617	8,579	7,418	18,011			15,236
Loan loss provision	343	310	328	322	300	215	168	128	153	159	515	312	1,303	$ 608	$ 515	608
Net Interest Income after Loan Loss Provision	4,523	4,123	4,161	3,901	4,091	3,973	3,831	3,691	3,648	3,458	8,064	7,106	16,708			14,628
NONINTEREST INCOME:
Service charges on deposit accounts											538	543	1,009			1,022
Net gain on sale of loans (includes $461 and $582 for the six months ended December 31, 2014 and 2013, respectively, related to accumulated other comprehensive earnings reclassification)											2,864	2,554	6,672			4,586
Mortgage loan servicing fees											767	653	1,718			1,372
Wealth management income											290	256	625			527
Net gain on sale of available-for-sale securities (includes $335 and $836 for the six months ended December 31, 2014 and 2013, respectively related to accumulated other comprehensive earnings reclassification)											335	836	234			1,073
Net (loss) gain on fair value hedge											(364)	71	(93)			(63)
Net loss on sale of real estate owned and other repossessed property											(1)	(50)	(13)			(50)
Other noninterest income											168	704	603			613
Total noninterest income	2,692	2,912	3,275	2,882	2,435	2,657	2,351	2,123	2,469	3,098	5,092	5,567	11,761			10,041
NONINTEREST EXPENSE:
Salaries and employee benefits											6,274	6,430	14,350			12,822
Occupancy and equipment expense											1,426	1,375	2,988			2,774
Data processing											1,082	931	2,259			1,870
Advertising											408	457	800			816
Amortization of mortgage servicing rights											328	334	799			630
Amortization of core deposit intangible and tax credits											208	217	432			427
Federal insurance premiums											174	168	332			271
Postage											95	92	181			175
Legal, accounting and examination fees											469	269	520			555
Consulting fees											351	155	576			537
Other noninterest expense											1,164	1,038	2,489			2,021
Total noninterest expense	6,401	6,492	6,472	6,361	6,114	5,865	5,743	5,699	5,613	5,853	11,979	11,466	25,726			22,908
Income before income tax expense	814	543	964	422	412	765	439	115	504	703	1,177	1,207	2,743			1,761
Income Tax (Benefit) Expense (includes $1,405 and ($1,605) for the six months ended December 31, 2014 and 2013, respectively, related to income tax benefit from reclassification items)	(67)	22	172	36	(512)	47	(423)	7	30	36	(465)	66	163			(350)
NET INCOME	$ 881	$ 521	$ 792	$ 386	$ 924	$ 718	$ 862	$ 108	$ 474	$ 667	$ 1,642	$ 1,141	$ 2,580			$ 2,111
Basic earnings per common share	$ 0.23	$ 0.14	$ 0.21	$ 0.10	$ 0.24	$ 0.18	$ 0.22	$ 0.03	$ 0.12	$ 0.17	$ 0.42	$ 0.29	$ 0.68			$ 0.54
Diluted Earnings Per Common share	$ 0.22	$ 0.14	$ 0.21	$ 0.10	$ 0.24	$ 0.18	$ 0.21	$ 0.03	$ 0.12	$ 0.17	$ 0.42	$ 0.29	$ 0.67			$ 0.53
Weighted Average Shares Outstanding (Basic EPS)											3,882,376	3,905,221	3,813,090			3,910,320
Weighted Average shares Outstanding (Diluted EPS)											3,931,552	3,978,260	3,859,625			3,974,316