Loans Receivable - Allowance for Loan Losses on Loans Not Covered (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses			$ 0	$ (1,549,966)
Loans receivable, net of undisbursed proceeds of loans in process	656,212,122		656,212,122		606,366,713
Non-covered loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance	8,494,197	8,494,412	8,473,373	8,188,896
Charge-offs	(59,102)	(92,506)	(147,393)	(160,499)
Recoveries	28,009	28,711	137,124	102,220
Provision for loan losses	0	0	0	300,000
Allowance for loan losses - ending balance	8,463,104	8,430,617	8,463,104	8,430,617
Allowance for loan losses: individually evaluated for impairment	0	0	0	0
Loans: individually evaluated for impairment	9,473,786	12,296,564	9,473,786	12,296,564
Loans: collectively evaluated for impairment	607,579,249	479,184,830	607,579,249	479,184,830
Loans receivable, net of undisbursed proceeds of loans in process	617,053,035	491,481,394	617,053,035	491,481,394	546,570,720
Non-covered loans | 1-4 family residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance	810,797	739,764	812,130	862,043
Charge-offs	(4,921)	(58,970)	(83,591)	(100,379)
Recoveries	0	0	4,000	0
Provision for loan losses	(180,370)	(9,298)	(107,033)	(90,168)
Allowance for loan losses - ending balance	625,506	671,496	625,506	671,496
Allowance for loan losses: individually evaluated for impairment	0	0	0	0
Loans: individually evaluated for impairment	1,517,435	1,301,330	1,517,435	1,301,330
Loans: collectively evaluated for impairment	170,613,813	133,879,683	170,613,813	133,879,683
Loans receivable, net of undisbursed proceeds of loans in process	172,131,248	135,181,013	172,131,248	135,181,013	152,810,501
Non-covered loans | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance	5,887,208	6,002,964	5,969,819	5,446,357
Charge-offs	(53,181)	(30,437)	(53,180)	(30,437)
Recoveries	325	9,111	94,623	70,231
Provision for loan losses	236,779	516,781	59,869	1,012,268
Allowance for loan losses - ending balance	6,071,131	6,498,419	6,071,131	6,498,419
Allowance for loan losses: individually evaluated for impairment	0	0	0	0
Loans: individually evaluated for impairment	7,881,126	10,800,578	7,881,126	10,800,578
Loans: collectively evaluated for impairment	332,290,554	260,355,853	332,290,554	260,355,853
Loans receivable, net of undisbursed proceeds of loans in process	340,171,680	271,156,431	340,171,680	271,156,431	300,556,023
Non-covered loans | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance	391,617	684,585	400,883	455,833
Charge-offs	0	0	0	(22,035)
Recoveries	23,129	19,052	32,607	29,062
Provision for loan losses	(17,135)	(262,314)	(35,879)	(21,537)
Allowance for loan losses - ending balance	397,611	441,323	397,611	441,323
Allowance for loan losses: individually evaluated for impairment	0	0	0	0
Loans: individually evaluated for impairment	75,225	194,656	75,225	194,656
Loans: collectively evaluated for impairment	29,356,581	21,306,110	29,356,581	21,306,110
Loans receivable, net of undisbursed proceeds of loans in process	29,431,806	21,500,766	29,431,806	21,500,766	24,759,682
Non-covered loans | Real estate construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance	470,369	362,591	492,903	387,302
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	(50,388)	42,909	(72,922)	18,198
Allowance for loan losses - ending balance	419,981	405,500	419,981	405,500
Allowance for loan losses: individually evaluated for impairment	0	0	0	0
Loans: individually evaluated for impairment	0	0	0	0
Loans: collectively evaluated for impairment	70,758,469	47,111,623	70,758,469	47,111,623
Loans receivable, net of undisbursed proceeds of loans in process	70,758,469	47,111,623	70,758,469	47,111,623	63,485,411
Non-covered loans | Consumer and other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance	14,144	54,067	13,990	124,717
Charge-offs	(1,000)	(3,099)	(10,622)	(7,648)
Recoveries	4,555	548	5,894	2,927
Provision for loan losses	(3,680)	64	4,757	(68,416)
Allowance for loan losses - ending balance	14,019	51,580	14,019	51,580
Allowance for loan losses: individually evaluated for impairment	0	0	0	0
Loans: individually evaluated for impairment	0	0	0	0
Loans: collectively evaluated for impairment	4,559,832	16,531,561	4,559,832	16,531,561
Loans receivable, net of undisbursed proceeds of loans in process	4,559,832	16,531,561	4,559,832	16,531,561	4,959,103
Non-covered loans | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance	920,062	650,441	783,648	912,644
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	14,794	(288,142)	151,208	(550,345)
Allowance for loan losses - ending balance	$ 934,856	$ 362,299	$ 934,856	$ 362,299