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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss)          
Accumulated Other Comprehensive Income (Loss), Tax (Expense) Benefit $ 3,096 $ 3,643 $ (2,880) $ (139) $ 2,823
Accumulated Other Comprehensive Income (Loss), Net of Tax 9,693 11,319 (9,030) (117) 9,221
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax 64,726 28,366 (22,264)    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 66,691 1,228 1,655    
AOCI before Tax, Attributable to Parent 12,789 14,962 (11,910) (256) $ 12,044
AOCI Before Tax Attributable to Parent after Cumulative Effect Adjustment       (12,300)  
AOCI Tax Attributable to Parent After Cumulative Effect Adjustment       2,962  
AOCI Net of Tax After Cumulative Effect Adjustment       $ (9,338)  
Consolidated Entity Excluding Noncontrolling Interests          
Accumulated Other Comprehensive Income (Loss)          
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax (64,421) (28,089) 9,999    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 66,594 1,217 1,655    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 16,648 (304) 414    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 49,946 1,521 1,241    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (48,320) (21,870) 7,672    
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax $ (16,101) $ (6,219) $ 2,327