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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
Sep. 30, 2025
USD ($)
Security
Dec. 31, 2024
USD ($)
Security
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 28 78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 287,534 $ 1,143,727
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (2,704) $ (15,221)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 579 600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 1,761,184 $ 1,776,769
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (270,250) (299,284)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,048,718 2,920,496
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (272,954) $ (314,505)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 7
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 0 $ 155,726
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ (1,754)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 180 180
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 1,013,285 $ 1,008,973
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (169,663) (210,368)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,013,285 1,164,699
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (169,663) $ (212,122)
State and Municipal Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 13 22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 32,823 $ 53,026
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (1,745) $ (1,692)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 271 272
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 746,671 $ 755,310
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (140,806) (143,754)
Debt Securities, Available-for-sale, Unrealized Loss Position 779,494 808,336
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (142,551) $ (145,446)
Corporate Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 3 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 19,150 $ 4,844
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (167) $ (13)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 29 47
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 194,669 $ 264,099
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,006) (14,421)
Debt Securities, Available-for-sale, Unrealized Loss Position 213,819 268,943
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (7,173) $ (14,434)
Collateralized Mortgage Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 3 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 49,367 $ 288,871
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (12) $ (3,463)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 73 77
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 77,186 $ 85,485
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,618) (10,438)
Debt Securities, Available-for-sale, Unrealized Loss Position 126,553 374,356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (7,630) $ (13,901)
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 6 42
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 137,019 $ 777,695
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (217) $ (9,178)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 75 69
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 262,049 $ 174,284
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (23,274) (30,823)
Debt Securities, Available-for-sale, Unrealized Loss Position 399,068 951,979
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (23,491) $ (40,001)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 7
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 0 $ 155,726
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ (1,754)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 120 120
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 283,766 $ 303,220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (45,910) (58,408)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 283,766 458,946
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (45,910) $ (60,162)
Commercial Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 3 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 49,175 $ 19,291
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (563) $ (875)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 131 135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 480,609 $ 497,591
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (91,546) (99,848)
Debt Securities, Available-for-sale, Unrealized Loss Position 529,784 516,882
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (92,109) $ (100,723)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 0 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 60 60
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 729,519 $ 705,753
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (123,753) (151,960)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 729,519 705,753
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (123,753) $ (151,960)