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Debt Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Fair Value    
Less Than 12 Months $ 198,721 $ 54
12 Months or Longer 916,646 962,837
Total 1,115,367 962,891
Gross Unrealized (Losses)    
Less Than 12 Months (1,114) (4)
12 Months or Longer (165,753) (158,615)
Total (166,867) (158,619)
U.S. government and agency obligations    
Fair Value    
Less Than 12 Months 166,186 0
12 Months or Longer 20,883 21,344
Total 187,069 21,344
Gross Unrealized (Losses)    
Less Than 12 Months (827) 0
12 Months or Longer (1,811) (1,810)
Total (2,638) (1,810)
Mortgage-backed securities and collateralized mortgage obligations    
Fair Value    
Less Than 12 Months 32,535 54
12 Months or Longer 814,739 863,026
Total 847,274 863,080
Gross Unrealized (Losses)    
Less Than 12 Months (287) (4)
12 Months or Longer (149,670) (141,939)
Total (149,957) (141,943)
Municipal obligations    
Fair Value    
Less Than 12 Months 0 0
12 Months or Longer 2,720 2,702
Total 2,720 2,702
Gross Unrealized (Losses)    
Less Than 12 Months 0 0
12 Months or Longer (47) (68)
Total (47) (68)
Corporate debt securities    
Fair Value    
Less Than 12 Months 0 0
12 Months or Longer 78,304 75,765
Total 78,304 75,765
Gross Unrealized (Losses)    
Less Than 12 Months 0 0
12 Months or Longer (14,225) (14,798)
Total $ (14,225) $ (14,798)