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Securities (Schedule of Unrealized Loss on Investments, AFS) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value    
Less than 12 months, fair value $ 289,705 $ 44,792
More than 12 months, fair value 52,305 757
Fair value 342,010 45,549
Unrealized Losses    
Less than 12 months, unrealized loss 5,136 408
More than 12 months, unrealized loss 893 16
Unrealized loss 6,029 424
Asset-backed securities issued by GSEs and U.S. Agencies    
Fair Value    
Less than 12 months, fair value 205,891 32,281
More than 12 months, fair value 41,327 670
Fair value 247,218 32,951
Unrealized Losses    
Less than 12 months, unrealized loss 3,997 320
More than 12 months, unrealized loss 776 7
Unrealized loss 4,773 327
Residential CMOs    
Fair Value    
Less than 12 months, fair value 0 0
More than 12 months, fair value 57 87
Fair value 57 87
Unrealized Losses    
Less than 12 months, unrealized loss 0 0
More than 12 months, unrealized loss 4 9
Unrealized loss 4 9
Student loan trust ABSs    
Fair Value    
Less than 12 months, fair value 21,640 12,511
More than 12 months, fair value 2,226 0
Fair value 23,866 12,511
Unrealized Losses    
Less than 12 months, unrealized loss 281 88
More than 12 months, unrealized loss 5 0
Unrealized loss 286 $ 88
Municipal bonds    
Fair Value    
Less than 12 months, fair value 47,314  
More than 12 months, fair value 6,696  
Fair value 54,010  
Unrealized Losses    
Less than 12 months, unrealized loss 776  
More than 12 months, unrealized loss 108  
Unrealized loss 884  
U.S. government obligations    
Fair Value    
Less than 12 months, fair value 14,860  
More than 12 months, fair value 1,999  
Fair value 16,859  
Unrealized Losses    
Less than 12 months, unrealized loss 82  
More than 12 months, unrealized loss 0  
Unrealized loss $ 82