Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Outstanding commitments
Undisbursed loan commitments	$ 109,300
Cash balance at bank federally insured amount	30,200
Outstanding borrowings	25,000	$ 34,000
FHLB [Member]
Loss Contingencies [Line Items]
Additional borrowing capacity	45,600
Overnight Line of Credit [Member]
Loss Contingencies [Line Items]
Overnight line of credit	15,000
Overnight Line of Credit [Member] | FHLB [Member]
Loss Contingencies [Line Items]
Overnight line of credit	30,000
Unsecured Overnight Facility [Member]
Loss Contingencies [Line Items]
Unsecured overnight borrowing capacity	8,000
Federal Home Loan Bank of Cincinnati [Member]
Loss Contingencies [Line Items]
Letters of credit	13,000
One Year Or Less [Member]
Loss Contingencies [Line Items]
Certificates of deposits	200,100
March 17, 2016 [Member]
Loss Contingencies [Line Items]
Outstanding borrowings	$ 4,000
Interest rate	5.34%
Maturity date	Mar. 17, 2016
July 6, 2018 [Member]
Loss Contingencies [Line Items]
Outstanding borrowings	$ 6,000
Interest rate	1.18%
Maturity date	Jul. 06, 2018
Loan Origination Commitments [Member]
Loss Contingencies [Line Items]
Outstanding commitments	$ 19,700