Borrowings - Amount of FHLB of Indianapolis/Pittsburgh Stock Purchased, Collateral Pledged and Assets Related to MICO's/Atlantic States Agreement (Parenthetical) (Detail) (Lines of Credit [Member], USD $)	Sep. 30, 2014
Indianapolis [Member] | MICO [Member]
Line of Credit Facility [Line Items]
Collateral pledged, at par, carrying value	$ 2,467,278
Pittsburgh [Member] | Atlantic States [Member]
Line of Credit Facility [Line Items]
Collateral pledged, at par, carrying value	$ 16,546,900