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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Security
Dec. 31, 2023
USD ($)
Security
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 1,143,727 $ 146,416
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (15,221) (3,240)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,776,769 2,145,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (299,284) (298,236)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,920,496 2,291,752
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (314,505) $ (301,476)
Debt securities, available for sale, number of positions | Security 600 671
Held to Maturity    
Estimated Fair Value, Less Than 12 Months $ 155,726 $ 0
Unrealized Losses, Less Than 12 Months (1,754) 0
Estimated Fair Value, 12 Months or Longer 1,008,973 1,072,207
Unrealized Losses, 12 Months or Longer (210,368) (195,715)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,164,699 1,072,207
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (212,122) $ (195,715)
Debt securities, held-to-maturity, number of positions | Security 180 180
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 78 56
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 7 0
U.S. Government securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months   $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   42,161
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   (314)
Debt Securities, Available-for-sale, Unrealized Loss Position   42,161
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss   $ (314)
Debt securities, available for sale, number of positions | Security   1
Held to Maturity    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security   0
US Government Agencies Debt Securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months   $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   1,010
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   (28)
Debt Securities, Available-for-sale, Unrealized Loss Position   1,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss   $ (28)
Debt securities, available for sale, number of positions | Security   1
Held to Maturity    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security   0
State and municipal securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 53,026 $ 76,155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,692) (858)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 755,310 917,274
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (143,754) (128,789)
Debt Securities, Available-for-sale, Unrealized Loss Position 808,336 993,429
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (145,446) $ (129,647)
Debt securities, available for sale, number of positions | Security 272 314
Held to Maturity    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 22 40
Corporate debt securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 4,844 $ 42,945
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (13) (1,326)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 264,099 370,523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (14,421) (39,310)
Debt Securities, Available-for-sale, Unrealized Loss Position 268,943 413,468
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (14,434) $ (40,636)
Debt securities, available for sale, number of positions | Security 47 60
Held to Maturity    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 1 8
Collateralized mortgage obligations    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 288,871 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3,463) 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 85,485 111,434
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (10,438) (11,390)
Debt Securities, Available-for-sale, Unrealized Loss Position 374,356 111,434
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (13,901) $ (11,390)
Debt securities, available for sale, number of positions | Security 77 93
Held to Maturity    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 12 0
Residential mortgage-backed securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 777,695 $ 409
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (9,178) (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 174,284 195,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (30,823) (26,482)
Debt Securities, Available-for-sale, Unrealized Loss Position 951,979 195,862
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (40,001) $ (26,485)
Debt securities, available for sale, number of positions | Security 69 69
Held to Maturity    
Estimated Fair Value, Less Than 12 Months $ 155,726 $ 0
Unrealized Losses, Less Than 12 Months (1,754) 0
Estimated Fair Value, 12 Months or Longer 303,220 355,270
Unrealized Losses, 12 Months or Longer (58,408) (51,805)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 458,946 355,270
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (60,162) $ (51,805)
Debt securities, held-to-maturity, number of positions | Security 120  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 42 6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 7 0
Commercial mortgage-backed securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 19,291 $ 26,907
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (875) (1,053)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 497,591 507,481
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (99,848) (91,923)
Debt Securities, Available-for-sale, Unrealized Loss Position 516,882 534,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (100,723) $ (92,976)
Debt securities, available for sale, number of positions | Security 135 133
Held to Maturity    
Estimated Fair Value, Less Than 12 Months $ 0 $ 0
Unrealized Losses, Less Than 12 Months 0 0
Estimated Fair Value, 12 Months or Longer 705,753 716,937
Unrealized Losses, 12 Months or Longer (151,960) (143,910)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 705,753 716,937
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (151,960) $ (143,910)
Debt securities, held-to-maturity, number of positions | Security 60 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 1 2
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 0