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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]    
Net income $ 39,420 $ 31,458
Other comprehensive income, before tax:    
Accumulated postretirement benefit obligation adjustment (143) 0
Unrealized gains on investments arising during the period 1,253 2,727
Reclassification adjustment for sale of securities included in net income (30) 0
Reclassification adjustment for write-down of securities included in net income 482 0
Other comprehensive income, before tax 1,562 2,727
Income tax benefit related to postretirement health benefits (31) 0
Income tax expense related to unrealized gains on investments arising during the year 262 576
Income tax benefit related to reclassification adjustment for sale of securities included in net income (6) 0
Income tax expense related to reclassification adjustment for write-down of securities included in net income 111 0
Net income tax expense on other comprehensive income 336 576
Other comprehensive income 1,226 2,151
Comprehensive Income $ 40,646 $ 33,609