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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 16,235 $ 7,262 $ 36,622 $ 14,230
Change in unrealized gain on investments:        
Unrealized (loss) gain arising during the period (1,458) 175 (1,183) 1,449
Call and repayment losses charged to investment income 3   18  
Reclassification adjustment for realized gains (loss) 8 (9) (12) (30)
Net change in unrealized gain (1,447) 166 (1,177) 1,419
Deferred income taxes on above change 559 (64) 454 (547)
Total other comprehensive (loss) income (888) 102 (723) 872
Comprehensive income $ 15,347 $ 7,364 $ 35,899 $ 15,102