XML 43 R40.htm IDEA: XBRL DOCUMENT v3.2.0.727
Securities - Additional Information (Detail)
 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Securities
Obligation
Dec. 31, 2014
Securities
Obligation
Amortized Cost and Fair Value Debt Securities [Abstract]    
Number of U.S. agency and mortgage-backed securities | Securities 47 29
Number of obligations of state and political subdivisions in an unrealized loss position | Obligation 24 7
Percentage of investment portfolio 100.00% 100.00%
Weighted-average period of re-pricing of portfolio 4 years 8 months 12 days 3 years 10 months 24 days
Impairment recognized $ 0