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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value    
Less Than 12 Months $ 11,003 $ 54
12 Months or Longer 916,270 962,837
Total 927,273 962,891
Gross Unrealized (Losses)    
Less Than 12 Months (5) (4)
12 Months or Longer (127,559) (158,615)
Total (127,564) (158,619)
U.S. government and agency obligations    
Fair Value    
Less Than 12 Months 0 0
12 Months or Longer 21,080 21,344
Total 21,080 21,344
Gross Unrealized (Losses)    
Less Than 12 Months 0 0
12 Months or Longer (1,133) (1,810)
Total (1,133) (1,810)
Mortgage-backed securities and collateralized mortgage obligations    
Fair Value    
Less Than 12 Months 9,993 54
12 Months or Longer 813,803 863,026
Total 823,796 863,080
Gross Unrealized (Losses)    
Less Than 12 Months (4) (4)
12 Months or Longer (113,467) (141,939)
Total (113,471) (141,943)
Municipal obligations    
Fair Value    
Less Than 12 Months 1,010 0
12 Months or Longer 1,809 2,702
Total 2,819 2,702
Gross Unrealized (Losses)    
Less Than 12 Months (1) 0
12 Months or Longer (26) (68)
Total (27) (68)
Corporate debt securities    
Fair Value    
Less Than 12 Months 0 0
12 Months or Longer 79,578 75,765
Total 79,578 75,765
Gross Unrealized (Losses)    
Less Than 12 Months 0 0
12 Months or Longer (12,933) (14,798)
Total $ (12,933) $ (14,798)