Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2014
|
Sep. 30, 2014
|
Jun. 30, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
Income Tax Disclosure [Abstract] | |||||||||||
U. S. federal tax expense at statutory rate | $ 8,379 | $ 16,189 | $ 13,760 | ||||||||
Increase (reduction) in income taxes resulting from: | |||||||||||
Small insurance company income exclusion | (451) | ||||||||||
State tax, net of federal benefit | 603 | 1,112 | 1,026 | ||||||||
Other | 155 | 159 | 226 | ||||||||
Total | $ 2,285 | $ 838 | $ 2,649 | $ 3,365 | $ 5,130 | $ 4,539 | $ 3,793 | $ 3,998 | $ 9,137 | $ 17,460 | $ 14,561 |