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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value    
Less Than 12 Months $ 84,396 $ 522,609
12 Months or Longer 913,235 788,133
Total 997,631 1,310,742
Gross Unrealized (Losses)    
Less Than 12 Months (945) (37,286)
12 Months or Longer (199,012) (150,162)
Total (199,957) (187,448)
U.S. government and agency obligations    
Fair Value    
Less Than 12 Months 73,213 47,956
12 Months or Longer 18,844 15,610
Total 92,057 63,566
Gross Unrealized (Losses)    
Less Than 12 Months (230) (2,359)
12 Months or Longer (2,378) (1,846)
Total (2,608) (4,205)
Mortgage-backed securities and collateralized mortgage obligations    
Fair Value    
Less Than 12 Months 11,183 424,328
12 Months or Longer 821,064 741,515
Total 832,247 1,165,843
Gross Unrealized (Losses)    
Less Than 12 Months (715) (29,013)
12 Months or Longer (181,658) (141,324)
Total (182,373) (170,337)
Municipal obligations    
Fair Value    
Less Than 12 Months 0 3,574
12 Months or Longer 2,664 0
Total 2,664 3,574
Gross Unrealized (Losses)    
Less Than 12 Months 0 (122)
12 Months or Longer (108) 0
Total (108) (122)
Corporate debt securities    
Fair Value    
Less Than 12 Months 0 46,751
12 Months or Longer 70,663 31,008
Total 70,663 77,759
Gross Unrealized (Losses)    
Less Than 12 Months 0 (5,792)
12 Months or Longer (14,868) (6,992)
Total $ (14,868) $ (12,784)