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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
Mar. 31, 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 45 78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 594,569 $ 1,143,727
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (7,997) $ (15,221)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 602 600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 1,754,350 $ 1,776,769
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (302,710) (299,284)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,348,919 2,920,496
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (310,707) $ (314,505)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 6 7
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 122,777 $ 155,726
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (117) $ (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 $ 1,020,131 $ 1,008,973
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (187,638) (210,368)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,142,908 1,164,699
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (187,755) $ (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 19 22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 45,225 $ 53,026
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (2,451) $ (1,692)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 277 272
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 745,510 $ 755,310
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (164,209) (143,754)
Debt Securities, Available-for-sale, Unrealized Loss Position 790,735 808,336
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (166,660) $ (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 1 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 9,500 $ 4,844
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (500) $ (13)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 44 47
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 251,670 $ 264,099
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (10,121) (14,421)
Debt Securities, Available-for-sale, Unrealized Loss Position 261,170 268,943
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (10,621) $ (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 5 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 115,249 $ 288,871
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (999) $ (3,463)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 77 77
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 83,216 $ 85,485
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (8,901) (10,438)
Debt Securities, Available-for-sale, Unrealized Loss Position 198,465 374,356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (9,900) $ (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 19 42
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 404,904 $ 777,695
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (3,632) $ (9,178)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 69 69
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 175,232 $ 174,284
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (26,503) (30,823)
Debt Securities, Available-for-sale, Unrealized Loss Position 580,136 951,979
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (30,135) $ (40,001)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 6 7
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 122,777 $ 155,726
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (117) $ (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 $ 299,666 $ 303,220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (52,096) (58,408)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 422,443 458,946
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (52,213) $ (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 1 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 19,691 $ 19,291
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (415) $ (875)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 135 135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 498,722 $ 497,591
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (92,976) (99,848)
Debt Securities, Available-for-sale, Unrealized Loss Position 518,413 516,882
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (93,391) $ (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 $ 720,465 $ 705,753
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (135,542) (151,960)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 720,465 705,753
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (135,542) $ (151,960)