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Securities - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, amortized cost, due in one year or less	$ 28,227
Held to Maturity, amortized cost, due after one year through five years	46,253
Held to Maturity, amortized cost, due after five years through ten years	45,117
Held to Maturity, amortized cost, due after ten years	11,836
Held to Maturity, amortized cost, subtotal	131,433
Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations	11,252,059
Held to Maturity, Amortized Cost	11,383,492	$ 12,365,308
Held to Maturity, fair value, due in one year or less	28,302
Held to Maturity, fair value, due after one year through five years	45,684
Held to Maturity, fair value, due after five years through ten years	40,099
Held to Maturity, fair value, due after ten years	10,645
Held to Maturity, fair value, subtotal	124,730
Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations	9,867,636
Held to Maturity, fair value, total	9,992,366	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	306,304
Available for Sale, Amortized Cost	320,654	440,358
Available for Sale, fair value, due after five years through ten years	16,080
Available for Sale, fair value, subtotal	16,080
Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations	302,567
Available for Sale securities, at fair value	$ 318,647	$ 438,588

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