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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 893,421 $ 852,401
Other comprehensive income (loss) before reclassifications (12,505) 18,143
Amounts reclassified from accumulated other comprehensive income 373 (5,787)
Net current-period other comprehensive income (loss) (12,132) 12,356
Ending balance 929,750 880,818
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 (12,505) 18,143
Amounts reclassified from accumulated other comprehensive income 0 (6,180)
Net current-period other comprehensive income (loss) (12,505) 11,963
Ending balance 3,244 19,467
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 373 393
Net current-period other comprehensive income (loss) 373 393
Ending balance (1,026) (1,988)
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 14,350 5,123
Ending balance $ 2,218 $ 17,479