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Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Available for Sale, Due in one year or less | $ 1,000 |
Available for Sale, Due after one year through five years | 54,051 |
Available for Sale, Due after five years through ten years | 44,549 |
Available for Sale, Due after ten years | 26,231 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 125,832 |
Available for Sale, Total debt securities | 4,251,409 | $ 3,749,814
Fair Value |  |
Available for Sale, Due in one year or less | 997 |
Available for Sale, Due after one year through five years | 50,642 |
Available for Sale, Due after five years through ten years | 43,392 |
Available for Sale, Due after ten years | 26,004 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 121,034 |
Available for Sale, Total debt securities | $ 4,152,527 | 3,600,892
Ratio of Fair Value to Amortized Cost, AFS | 97.70% |
Amortized Cost |  |
Held to Maturity, Due in one year or less | $ 11,435 |
Held to Maturity, Due after one year through five years | 58,464 |
Held to Maturity, Due after five years through ten years | 179,171 |
Held to Maturity, Due after ten years | 1,416,669 |
Held to Maturity, Total Debt Securities | 1,665,740 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,769,224 | 3,860,235
Fair Value |  |
Held to Maturity, Due in one year or less | 11,360 |
Held to Maturity, Due after one year through five years | 58,594 |
Held to Maturity, Due after five years through ten years | 175,603 |
Held to Maturity, Due after ten years | 1,295,781 |
Held to Maturity, Securities, Debt Securities | 1,541,338 |
Debt Securities, Held-to-Maturity, Fair Value | $ 3,352,775 | 3,380,624
Ratio of Fair Value to Amortized Cost, HTM | 89.00% |
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | $ 0 |
Fair Value |  |
Available for Sale, Total debt securities | 0 |
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 329,349 | 345,083
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 282,103 | 289,507
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 113,139 | 135,832
Fair Value |  |
Available for Sale, Total debt securities | 112,350 | 133,975
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 0 |
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 540 | 1,077
Fair Value |  |
Available for Sale, Total debt securities | 516 | 1,051
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 0 |
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 |
US Government Sponsored-Enterprise Insured Loans | Residential Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 1,201,968 | 1,274,052
Fair Value |  |
Available for Sale, Total debt securities | 1,085,414 | 1,120,794
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 900,743 | 941,973
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 778,883 | 804,393
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 18,423 | 18,691
Fair Value |  |
Available for Sale, Total debt securities | 18,035 | 16,937
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 775,209 | 780,995
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 659,852 | 632,914
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 2,634,634 | 2,021,242
Fair Value |  |
Available for Sale, Total debt securities | 2,663,560 | 2,042,675
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 45,180 | 48,979
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | 42,979 | 46,170
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available for Sale, Total debt securities | 156,873 | 161,928
Fair Value |  |
Available for Sale, Total debt securities | 151,617 | 154,793
Amortized Cost |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 53,005 | 59,733
Fair Value |  |
Debt Securities, Held-to-Maturity, Fair Value | $ 47,620 | $ 52,619

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