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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2019
Increase (Decrease) in Accumulated Other Comprehensive (Loss) Income [Roll Forward]      
Beginning balance $ 809,311 $ 760,723  
Other comprehensive income 7,914 8,016  
Effects of implementation of accounting change related to operating leases     $ (399)
Ending balance 798,438 778,191  
Accumulated other comprehensive income (loss), net      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax 8,707 8,028  
Increase (Decrease) in Accumulated Other Comprehensive (Loss) Income [Roll Forward]      
Beginning balance 10,378 (7,455)  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 793 12  
Other comprehensive income 7,914 8,016  
Effects of implementation of accounting change related to operating leases 0    
Ending balance $ 18,292 $ 561