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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Net income $ 11,142 $ 12,089 $ 29,052 $ 34,809
Investments available-for-sale:        
Net change in unrealized gains (losses) on investments available-for-sale (2,714) (1,032) 10,779 (24,925)
Related income tax (expense) benefit 1,061 407 (4,284) 9,935
Net investment gains reclassified into earnings 8   8 118
Related income tax expense (3)   (3) (47)
Net effect on other comprehensive income (loss) for the period (1,648) (625) 6,500 (14,919)
Defined benefit pension plan:        
Recognition of unrealized gain 67 249 183 1,176
Related income tax benefit (20) (91) (81) (461)
Net effect on other comprehensive income (loss) for the period 48 158 102 715
Total other comprehensive income (loss) (1,600) (467) 6,602 (14,204)
Comprehensive income $ 9,541 $ 11,622 $ 35,654 $ 20,605