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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net income $ 33,414 $ 27,740 $ 84,841 $ 79,024
Net unrealized holding gains/(losses) on marketable securities:        
Unrealized holding gains/(losses) net of tax of ($525), $788, ($4,549), $2,869, respectively 1,315 (1,970) 11,376 (7,169)
Reclassification adjustment for gains included in net income, net of tax of $0, $17, $1 and $54, respectively (1) (44) (3) (138)
Net unrealized holding gains/(losses) on marketable securities 1,314 (2,014) 11,373 (7,307)
Change in fair value of interest rate swaps, net of tax of $0, ($51), $0 and ($204), respectively 0   0  
Change in fair value of interest rate swaps, net of tax of $0, ($51), $0 and ($204), respectively   192   766
Defined benefit plan:        
Reclassification adjustments for prior period service costs and net losses included in net income, net of tax of ($83), ($90), ($250) and ($271), respectively 208 226 626 678
Other comprehensive income/(loss) 1,522 (1,596) 11,999 (5,863)
Total comprehensive income $ 34,936 $ 26,144 $ 96,840 $ 73,161