Securities Sold Under Agreement to Repurchase and Other Borrowings - Additional Information (Detail) (USD $)	12 Months Ended	6 Months Ended
	Dec. 31, 2014 Tranches	Dec. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Number of repurchase agreement tranche	1
Fair value of mortgage-backed securities	$ 54,700,000	$ 54,700,000	$ 121,200,000
Other borrowings, Amount	558,000	558,000	578,000
Tranche One [Member]
Schedule of Held-to-maturity Securities [Line Items]
Repurchase agreements tranche amount	30,000,000	30,000,000
Maturity date of tranche	Feb. 20, 2017
Home Savings [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amount prepaid on repurchase agreements		60,000,000
Prepayment penalty on repurchase agreements		$ 3,400,000