XML 52 R40.htm IDEA: XBRL DOCUMENT v3.5.0.2
Securities - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Securities
Security
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Securities
Obligation
Security
Jun. 30, 2015
USD ($)
Dec. 31, 2015
Securities
Obligation
Amortized Cost and Fair Value Debt Securities [Abstract]          
Number of U.S. agency and mortgage-backed securities | Securities 13   13   52
Number of obligations of state and political subdivisions in an unrealized loss position | Obligation     1   13
Percentage of investment portfolio     100.00%   100.00%
Weighted-average period of re-pricing of portfolio     3 years 10 months 24 days   4 years 7 months 6 days
Gross gains or losses on held to maturity securities $ 0   $ 0    
Proceeds from sales of securities held to maturity $ 657,000 $ 0 $ 657,000 $ 0  
Held to maturity securities, number of securities sold | Security 1   1    
Impairment recognized     $ 0