Note 8. Short-Term Borrowings (Details) - Short-term Borrowings - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Short-term Debt [Abstract]
Overnight repurchase agreements with customers	$ 73,872,716	$ 137,251,670
Federal funds purchased	70,790,000	131,100,000
	$ 144,662,716	$ 268,351,670

Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a)(7))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_OtherShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant