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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Less Than 12 Months    
Fair Value $ 54 $ 522,609
Gross Unrealized (Losses) (4) (37,286)
12 Months or Longer    
Fair Value 962,837 788,133
Gross Unrealized (Losses) (158,615) (150,162)
Total    
Fair Value 962,891 1,310,742
Gross Unrealized (Losses) (158,619) (187,448)
U.S. government and agency obligations    
Less Than 12 Months    
Fair Value 0 47,956
Gross Unrealized (Losses) 0 (2,359)
12 Months or Longer    
Fair Value 21,344 15,610
Gross Unrealized (Losses) (1,810) (1,846)
Total    
Fair Value 21,344 63,566
Gross Unrealized (Losses) (1,810) (4,205)
Mortgage-backed securities and collateralized mortgage obligations    
Less Than 12 Months    
Fair Value 54 424,328
Gross Unrealized (Losses) (4) (29,013)
12 Months or Longer    
Fair Value 863,026 741,515
Gross Unrealized (Losses) (141,939) (141,324)
Total    
Fair Value 863,080 1,165,843
Gross Unrealized (Losses) (141,943) (170,337)
Municipal obligations    
Less Than 12 Months    
Fair Value 0 3,574
Gross Unrealized (Losses) 0 (122)
12 Months or Longer    
Fair Value 2,702 0
Gross Unrealized (Losses) (68) 0
Total    
Fair Value 2,702 3,574
Gross Unrealized (Losses) (68) (122)
Corporate debt securities    
Less Than 12 Months    
Fair Value 0 46,751
Gross Unrealized (Losses) 0 (5,792)
12 Months or Longer    
Fair Value 75,765 31,008
Gross Unrealized (Losses) (14,798) (6,992)
Total    
Fair Value 75,765 77,759
Gross Unrealized (Losses) $ (14,798) $ (12,784)