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Securities - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, amortized cost, due in one year or less	$ 14,781
Held to Maturity, amortized cost, due after one year through five years	48,167
Held to Maturity, amortized cost, due after five years through ten years	45,570
Held to Maturity, amortized cost, due after ten years	7,468
Held to Maturity, amortized cost, subtotal	115,986
Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations	10,641,478
Held to Maturity, Amortized Cost	10,757,464	$ 12,365,308
Held to Maturity, fair value, due in one year or less	14,786
Held to Maturity, fair value, due after one year through five years	47,569
Held to Maturity, fair value, due after five years through ten years	40,800
Held to Maturity, fair value, due after ten years	6,657
Held to Maturity, fair value, subtotal	109,812
Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations	9,272,667
Held to Maturity, fair value, total	9,382,479	10,984,598
Available for Sale, amortized cost, due after one year through five years	700
Available for Sale, amortized cost, due after five years through ten years	13,650
Available for Sale, amortized cost, subtotal	14,350
Available for Sale, amortized cost, mortgage-backed securities and collateralized mortgage obligations	324,666
Available for Sale, Amortized Cost	339,016	440,358
Available for Sale, fair value, due after one year through five years	815
Available for Sale, fair value, due after five years through ten years	15,510
Available for Sale, fair value, subtotal	16,325
Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations	320,635
Available for Sale securities, at fair value	$ 336,960	$ 438,588

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