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Investment Securities - Gross unrealized losses and fair value (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of securities | security 248 239
Less than 12 months, estimated fair value $ 1,377,086 $ 1,891,310
Less than 12 months, unrealized losses 102,468 24,285
12 months or greater, estimated fair value 335,070 177,038
12 months or greater, unrealized losses 40,379 5,322
Estimated fair value 1,712,156 2,068,348
Unrealized losses $ 142,847 $ 29,607
U.S. treasury bonds    
Debt Securities, Available-for-sale [Line Items]    
Number of securities | security 2 1
Less than 12 months, estimated fair value $ 47,081 $ 24,593
Less than 12 months, unrealized losses 2,661 257
12 months or greater, estimated fair value 0 0
12 months or greater, unrealized losses 0 0
Estimated fair value 47,081 24,593
Unrealized losses $ 2,661 $ 257
U. S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities | security 83 64
Less than 12 months, estimated fair value $ 501,147 $ 452,966
Less than 12 months, unrealized losses 32,941 6,256
12 months or greater, estimated fair value 191,362 68,977
12 months or greater, unrealized losses 19,909 1,366
Estimated fair value 692,509 521,943
Unrealized losses $ 52,850 $ 7,622
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities | security 148 153
Less than 12 months, estimated fair value $ 713,803 $ 1,327,519
Less than 12 months, unrealized losses 62,471 16,841
12 months or greater, estimated fair value 143,708 108,061
12 months or greater, unrealized losses 20,470 3,956
Estimated fair value 857,511 1,435,580
Unrealized losses $ 82,941 $ 20,797
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities | security 13  
Less than 12 months, estimated fair value $ 104,688  
Less than 12 months, unrealized losses 3,720  
12 months or greater, estimated fair value 0  
12 months or greater, unrealized losses 0  
Estimated fair value 104,688  
Unrealized losses $ 3,720  
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Number of securities | security 1 8
Less than 12 months, estimated fair value $ 8,404 $ 20,181
Less than 12 months, unrealized losses 638 347
12 months or greater, estimated fair value 0 0
12 months or greater, unrealized losses 0 0
Estimated fair value 8,404 20,181
Unrealized losses $ 638 $ 347
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Number of securities | security 1 13
Less than 12 months, estimated fair value $ 1,963 $ 66,051
Less than 12 months, unrealized losses 37 584
12 months or greater, estimated fair value 0 0
12 months or greater, unrealized losses 0 0
Estimated fair value 1,963 66,051
Unrealized losses $ 37 $ 584