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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 22,022 $ 16,430 $ 47,400 $ 34,050
Change in unrealized (loss) gain on investments:        
Net unrealized (loss) gain arising during the period (3,912) 3,541 (3,175) 5,847
Other-than-temporary impairment loss 293   1,983  
Call and repayment losses charged to investment income 19 2 55 17
Reclassification adjustment for realized losses (gains) 74 (1,167) 267 (1,171)
Net change in unrealized (loss) gain (3,526) 2,376 (870) 4,693
Deferred income taxes on above change 1,360 (917) 335 (1,810)
Total other comprehensive (loss) income, net of income taxes (2,166) 1,459 (535) 2,883
Comprehensive income $ 19,856 $ 17,889 $ 46,865 $ 36,933