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Securities - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, amortized cost, due in one year or less	$ 16,053
Held to Maturity, amortized cost, due after one year through five years	41,405
Held to Maturity, amortized cost, due after five years through ten years	33,293
Held to Maturity, amortized cost, due after ten years	7,385
Held to Maturity, amortized cost, subtotal	98,136
Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations	10,167,860
Held to Maturity, Amortized Cost	10,265,996	$ 10,757,464
Held to Maturity, fair value, due in one year or less	16,042
Held to Maturity, fair value, due after one year through five years	41,020
Held to Maturity, fair value, due after five years through ten years	30,052
Held to Maturity, fair value, due after ten years	6,563
Held to Maturity, fair value, subtotal	93,677
Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations	9,062,347
Held to Maturity, fair value, total	9,156,024	9,382,479
Available for Sale, amortized cost, due after five years through ten years	13,650
Available for Sale, amortized cost, subtotal	13,650
Available for Sale, amortized cost, mortgage-backed securities and collateralized mortgage obligations	330,115
Available for Sale, Amortized Cost	343,765	339,016
Available for Sale, fair value, due after five years through ten years	16,553
Available for Sale, fair value, subtotal	16,553
Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations	325,555
Available for Sale securities, at fair value	$ 342,108	$ 336,960

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