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Investment Securities - Amortized Cost and Fair Value Classified by Contractual Maturity Date on Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investment Securities, Available for Sale, Amortized Cost, Classified by Contractual Maturity Date
Due in one year or less	$ 0
Due after one year through five years	6,508
Due after five years through ten years	36,916
Due after ten years	53,411
Total investment securities due at a single maturity date	96,835
MBS	812,188
Investment Securities, Available-for-Sale, Amortized Cost, Total	909,023
Investment Securities, Available for Sale, Fair Value, Classified by Contractual Maturity
Due in one year or less	0
Due after one year through five years	6,320
Due after five years through ten years	34,635
Due after ten years	45,068
Total investment securities due at a single maturity date	86,023
MBS	766,756
Investment Securities, Available-for-Sale, Fair Value, Total	852,779
Investment Securities, Held to Maturity, Amortized Cost, Classified by Contractual Maturity Date
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	93,285
Due after ten years	57,896
Total investment securities due at a single maturity date	151,181
MBS(1)	568,219
Investment Securities, Held-to-Maturity, Amortized Cost, Total	719,400	$ 739,442
Investment Securities, Held for Sale, Fair Value, Classified by Contractual Maturity
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	81,365
Due after ten years	46,708
Total investment securities due at a single maturity date	128,073
MBS(1)	533,623
Investment Securities, Held-to-Maturity, Fair Value, Total	$ 661,696	$ 662,450

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