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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Less Than 12 Months    
Fair Value $ 522,609 $ 864,455
Gross Unrealized (Losses) (37,286) (12,799)
12 Months or Longer    
Fair Value 788,133 67,112
Gross Unrealized (Losses) (150,162) (1,676)
Total    
Fair Value 1,310,742 931,567
Gross Unrealized (Losses) (187,448) (14,475)
U.S. government and agency obligations    
Less Than 12 Months    
Fair Value 47,956 14,488
Gross Unrealized (Losses) (2,359) (236)
12 Months or Longer    
Fair Value 15,610 0
Gross Unrealized (Losses) (1,846) 0
Total    
Fair Value 63,566 14,488
Gross Unrealized (Losses) (4,205) (236)
Mortgage-backed securities and collateralized mortgage obligations    
Less Than 12 Months    
Fair Value 424,328 820,746
Gross Unrealized (Losses) (29,013) (11,892)
12 Months or Longer    
Fair Value 741,515 62,407
Gross Unrealized (Losses) (141,324) (1,381)
Total    
Fair Value 1,165,843 883,153
Gross Unrealized (Losses) (170,337) (13,273)
Municipal obligations    
Less Than 12 Months    
Fair Value 3,574  
Gross Unrealized (Losses) (122)  
12 Months or Longer    
Fair Value 0  
Gross Unrealized (Losses) 0  
Total    
Fair Value 3,574  
Gross Unrealized (Losses) (122)  
Corporate debt securities    
Less Than 12 Months    
Fair Value 46,751 29,221
Gross Unrealized (Losses) (5,792) (671)
12 Months or Longer    
Fair Value 31,008 4,705
Gross Unrealized (Losses) (6,992) (295)
Total    
Fair Value 77,759 33,926
Gross Unrealized (Losses) $ (12,784) $ (966)