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Available-for-Sale and Held-to-Maturity Securities (Schedule of Gross Unrealized Losses and Estimated Fair Value by Length of Time) (Details) $ in Thousands | Mar. 31, 2024 USD ($)
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | $ (1,159)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 56,408
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (186,073)
Available-for-sale Securities, Estimated fair value, 12 months or more | 1,415,189
Available-for-sale Securities, Gross unrealized losses, Total | (187,232)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,471,597
U.S. Government Agency Securities [Member] |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | (1)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 442
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (174)
Available-for-sale Securities, Estimated fair value, 12 months or more | 1,767
Available-for-sale Securities, Gross unrealized losses, Total | (175)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 2,209
Corporate Fixed Income Securities [Member] |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | (96)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 6,526
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (57,683)
Available-for-sale Securities, Estimated fair value, 12 months or more | 536,471
Available-for-sale Securities, Gross unrealized losses, Total | (57,779)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 542,997
Mortgage-Backed Securities [Member] | Agency Securities [Member] |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | (240)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 14,817
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (123,153)
Available-for-sale Securities, Estimated fair value, 12 months or more | 698,787
Available-for-sale Securities, Gross unrealized losses, Total | (123,393)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 713,604
Mortgage-Backed Securities [Member] | Commercial [Member] |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | 0
Available-for-sale Securities, Estimated fair value, Less than 12 months | 0
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (3,252)
Available-for-sale Securities, Estimated fair value, 12 months or more | 66,854
Available-for-sale Securities, Gross unrealized losses, Total | (3,252)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 66,854
Mortgage-Backed Securities [Member] | Non Agency Mortgage Backed Securities [Member] |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | 0
Available-for-sale Securities, Estimated fair value, Less than 12 months | 0
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (11)
Available-for-sale Securities, Estimated fair value, 12 months or more | 248
Available-for-sale Securities, Gross unrealized losses, Total | (11)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 248
Asset-Backed Securities [Member] |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | (822)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 34,623
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (1,800)
Available-for-sale Securities, Estimated fair value, 12 months or more | 111,062
Available-for-sale Securities, Gross unrealized losses, Total | (2,622)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 145,685

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