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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 893,421 $ 852,401
Other comprehensive income (loss) before reclassifications (15,334) 18,128
Amounts reclassified from accumulated other comprehensive income 259 (5,905)
Net current-period other comprehensive income (loss) (15,075) 12,223
Ending balance 904,510 867,891
Unrealized Gain (Loss) on Securities Available for Sale    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 15,749 7,504
Other comprehensive income (loss) before reclassifications (15,334) 18,128
Amounts reclassified from accumulated other comprehensive income 0 (6,180)
Net current-period other comprehensive income (loss) (15,334) 11,948
Ending balance 415 19,452
Postretirement Plans Asset (Liability)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (1,399) (2,381)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income 259 275
Net current-period other comprehensive income (loss) 259 275
Ending balance (1,140) (2,106)
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 14,350 5,123
Ending balance $ (725) $ 17,346