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Securities - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, amortized cost, due in one year or less	$ 17,607
Held to Maturity, amortized cost, due after one year through five years	48,525
Held to Maturity, amortized cost, due after five years through ten years	39,826
Held to Maturity, amortized cost, due after ten years	7,509
Held to Maturity, amortized cost, subtotal	113,467
Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations	10,855,875
Held to Maturity, Amortized Cost	10,969,342	$ 12,365,308
Held to Maturity, fair value, due in one year or less	17,629
Held to Maturity, fair value, due after one year through five years	48,545
Held to Maturity, fair value, due after five years through ten years	35,711
Held to Maturity, fair value, due after ten years	6,763
Held to Maturity, fair value, subtotal	108,648
Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations	9,855,412
Held to Maturity, fair value, total	9,964,060	10,984,598
Available for Sale, amortized cost, due after five years through ten years	14,350
Available for Sale, amortized cost, subtotal	14,350
Available for Sale, amortized cost, mortgage-backed securities and collateralized mortgage obligations	318,134
Available for Sale, Amortized Cost	332,484	440,358
Available for Sale, fair value, due after five years through ten years	16,282
Available for Sale, fair value, subtotal	16,282
Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations	315,132
Available for Sale securities, at fair value	$ 331,414	$ 438,588

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