Allowance for Loan Losses - Company's Recorded Investment and Customers' Unpaid Principal Balances for Impaired Loans, with Associated Allowance Amount (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
With no related allowance, Recorded Investment	$ 3,911,382		$ 3,439,723
With no related allowance, Customers' Unpaid Principal Balance	3,924,832		4,253,474
With an allowance recorded, Recorded Investment	2,744,331		4,141,957
With an allowance recorded, Customers' Unpaid Principal Balance	3,376,728		4,187,481
With an allowance recorded, Related Allowance	666,551		833,883
Total Impaired Loans, Recorded Investment	6,655,713		7,581,680
Total Impaired Loans, Customers' Unpaid Principal Balance	7,301,560		8,440,955
Total Impaired Loans, Related Allowance	666,551		833,883
With no related allowance, Average Recorded Investment	2,126,859		3,385,146
With no related allowance, Interest Income Recognized	113,815		125,563
With an allowance recorded, Average Recorded Investment	2,281,351		3,109,017
With an allowance recorded, Interest Income Recognized	122,624		114,257
Total, Average Recorded Investment	4,408,210		6,494,163
Total, Interest Income Recognized	236,439		239,820
Construction Land And Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
With no related allowance, Recorded Investment	452,429		213,768
With no related allowance, Customers' Unpaid Principal Balance	453,350		213,914
With an allowance recorded, Recorded Investment	151,147		61,882
With an allowance recorded, Customers' Unpaid Principal Balance	155,791		65,566
With an allowance recorded, Related Allowance	51,447		25,882
Total Impaired Loans, Recorded Investment	603,576		275,650
Total Impaired Loans, Customers' Unpaid Principal Balance	609,141		279,480
Total Impaired Loans, Related Allowance	51,447		25,882
With no related allowance, Average Recorded Investment	189,058		202,754
With no related allowance, Interest Income Recognized	1,493		292
With an allowance recorded, Average Recorded Investment	30,229		63,761
Total, Average Recorded Investment	219,287		266,515
Total, Interest Income Recognized	1,493		292
Residential First Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
With no related allowance, Recorded Investment	1,053,222		1,495,910
With no related allowance, Customers' Unpaid Principal Balance	1,056,696		1,495,910
With an allowance recorded, Recorded Investment	2,198,253		2,782,380
With an allowance recorded, Customers' Unpaid Principal Balance	2,198,253		2,807,875
With an allowance recorded, Related Allowance	408,652		467,454
Total Impaired Loans, Recorded Investment	3,251,475		4,278,290
Total Impaired Loans, Customers' Unpaid Principal Balance	3,254,949		4,303,785
Total Impaired Loans, Related Allowance	408,652		467,454
With no related allowance, Average Recorded Investment	678,171		1,372,196
With no related allowance, Interest Income Recognized	47,960		87,917
With an allowance recorded, Average Recorded Investment	1,916,379		1,803,730
With an allowance recorded, Interest Income Recognized	107,608		76,058
Total, Average Recorded Investment	2,594,550		3,175,926
Total, Interest Income Recognized	155,568		163,975
Residential Revolving and Junior Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
With no related allowance, Recorded Investment			971,654	[1]
With no related allowance, Customers' Unpaid Principal Balance			1,785,259	[1]
With an allowance recorded, Recorded Investment	250,676	[1]	365,107	[1]
With an allowance recorded, Customers' Unpaid Principal Balance	878,429	[1]	381,452	[1]
With an allowance recorded, Related Allowance	172,453	[1]	101,253	[1]
Total Impaired Loans, Recorded Investment	250,676	[1]	1,336,761	[1]
Total Impaired Loans, Customers' Unpaid Principal Balance	878,429	[1]	2,166,711	[1]
Total Impaired Loans, Related Allowance	172,453	[1]	101,253	[1]
With no related allowance, Average Recorded Investment			1,380,596	[2]
With no related allowance, Interest Income Recognized			6,238	[2]
With an allowance recorded, Average Recorded Investment	254,149	[2]	310,725	[2]
With an allowance recorded, Interest Income Recognized	8,236	[2]	1,953	[2]
Total, Average Recorded Investment	254,149	[2]	1,691,321	[2]
Total, Interest Income Recognized	8,236	[2]	8,191	[2]
Commercial Mortgages Non Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
With no related allowance, Recorded Investment	264,056
With no related allowance, Customers' Unpaid Principal Balance	264,056
Total Impaired Loans, Recorded Investment	264,056
Total Impaired Loans, Customers' Unpaid Principal Balance	264,056
With no related allowance, Average Recorded Investment	105,622
With no related allowance, Interest Income Recognized	7,945
Total, Average Recorded Investment	105,622
Total, Interest Income Recognized	7,945
Commercial Mortgages Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
With no related allowance, Recorded Investment	1,830,746		758,391
With no related allowance, Customers' Unpaid Principal Balance	1,839,801		758,391
With an allowance recorded, Recorded Investment	105,351		858,610
With an allowance recorded, Customers' Unpaid Principal Balance	105,351		858,610
With an allowance recorded, Related Allowance	967		165,084
Total Impaired Loans, Recorded Investment	1,936,097		1,617,001
Total Impaired Loans, Customers' Unpaid Principal Balance	1,945,152		1,617,001
Total Impaired Loans, Related Allowance	967		165,084
With no related allowance, Average Recorded Investment	1,091,822		429,600
With no related allowance, Interest Income Recognized	56,417		31,116
With an allowance recorded, Average Recorded Investment	21,070		863,479
With an allowance recorded, Interest Income Recognized	1,733		27,861
Total, Average Recorded Investment	1,112,892		1,293,079
Total, Interest Income Recognized	58,150		58,977
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
With no related allowance, Recorded Investment	310,929
With no related allowance, Customers' Unpaid Principal Balance	310,929
Total Impaired Loans, Recorded Investment	310,929
Total Impaired Loans, Customers' Unpaid Principal Balance	310,929
With no related allowance, Average Recorded Investment	62,186
Total, Average Recorded Investment	62,186
Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
With an allowance recorded, Recorded Investment	38,904	[3]	73,978	[3]
With an allowance recorded, Customers' Unpaid Principal Balance	38,904	[3]	73,978	[3]
With an allowance recorded, Related Allowance	33,032	[3]	74,210	[3]
Total Impaired Loans, Recorded Investment	38,904	[3]	73,978	[3]
Total Impaired Loans, Customers' Unpaid Principal Balance	38,904	[3]	73,978	[3]
Total Impaired Loans, Related Allowance	33,032	[3]	74,210	[3]
With an allowance recorded, Average Recorded Investment	59,524	[4]	67,322	[4]
With an allowance recorded, Interest Income Recognized	5,047	[4]	8,385	[4]
Total, Average Recorded Investment	59,524	[4]	67,322	[4]
Total, Interest Income Recognized	$ 5,047	[4]	$ 8,385	[4]

[1] Junior mortgages include equity lines

[2] Junior mortgages include equity lines.

[3] Includes credit cards

[4] Includes credit cards.