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Securities - AFS in an Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
item
Number of Securities    
Unrealized loss for less than twelve months | item 135 43
Unrealized loss for twelve months or longer | item 20 5
Total | item 155 48
Fair Value    
Unrealized loss for less than twelve months $ 1,122,510 $ 353,961
Unrealized loss for twelve months or longer 139,453 13,611
Total 1,261,963 367,572
Unrealized Loss    
Unrealized loss for less than twelve months 16,978 2,254
Unrealized loss for twelve months or longer 3,983 46
Total $ 20,961 $ 2,300
US Treasury Securities    
Number of Securities    
Unrealized loss for less than twelve months | item 1  
Total | item 1  
Fair Value    
Unrealized loss for less than twelve months $ 4,956  
Total 4,956  
Unrealized Loss    
Unrealized loss for less than twelve months 16  
Total $ 16  
Bonds    
Number of Securities    
Unrealized loss for less than twelve months | item 1 8
Unrealized loss for twelve months or longer | item 1  
Total | item 2 8
Fair Value    
Unrealized loss for less than twelve months $ 4,985 $ 60,298
Unrealized loss for twelve months or longer 6,389  
Total 11,374 60,298
Unrealized Loss    
Unrealized loss for less than twelve months 15 325
Unrealized loss for twelve months or longer 57  
Total $ 72 $ 325
Residential Mortgage Backed Securities    
Number of Securities    
Unrealized loss for less than twelve months | item 58 15
Unrealized loss for twelve months or longer | item 5  
Total | item 63 15
Fair Value    
Unrealized loss for less than twelve months $ 608,502 $ 86,287
Unrealized loss for twelve months or longer 27,357  
Total 635,859 86,287
Unrealized Loss    
Unrealized loss for less than twelve months 7,983 429
Unrealized loss for twelve months or longer 264  
Total $ 8,247 $ 429
Commercial mortgage-backed securities    
Number of Securities    
Unrealized loss for less than twelve months | item 11 10
Unrealized loss for twelve months or longer | item 7  
Total | item 18 10
Fair Value    
Unrealized loss for less than twelve months $ 132,020 $ 105,386
Unrealized loss for twelve months or longer 59,021  
Total 191,041 105,386
Unrealized Loss    
Unrealized loss for less than twelve months 4,765 1,176
Unrealized loss for twelve months or longer 3,364  
Total $ 8,129 $ 1,176
Collateralized Mortgage Obligations    
Number of Securities    
Unrealized loss for less than twelve months | item 39 10
Unrealized loss for twelve months or longer | item 7 5
Total | item 46 15
Fair Value    
Unrealized loss for less than twelve months $ 363,054 $ 101,990
Unrealized loss for twelve months or longer 46,686 13,611
Total 409,740 115,601
Unrealized Loss    
Unrealized loss for less than twelve months 3,943 324
Unrealized loss for twelve months or longer 298 46
Total $ 4,241 $ 370
States and political subdivisions    
Number of Securities    
Unrealized loss for less than twelve months | item 25  
Total | item 25  
Fair Value    
Unrealized loss for less than twelve months $ 8,993  
Total 8,993  
Unrealized Loss    
Unrealized loss for less than twelve months 256  
Total $ 256