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Investment Securities - Contractual Maturities of Securities Available-for-Sale (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	$ 0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	229,342
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	539,587
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	1,888,352
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	216,470
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	481,305
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(1,588,907)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	2,657,281
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	2,286,682
Agency residential MBS
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	1,364,245
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(1,137,469)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	1,364,245
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	1,137,469
Agency commercial MBS
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	168,889
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	73,834
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	17,393
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	159,271
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	67,780
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(16,336)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	260,116
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	243,387
Agency residential CMOs
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	36,144
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	15,122
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	266,339
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	33,651
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	14,020
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(233,898)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	317,605
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	281,569
Municipal securities
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	16,878
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	17,767
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	16,411
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	16,848
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	34,645
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	33,259
Corporate Debt Securities
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	5,000
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	322,447
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	4,825
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	272,373
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	327,447
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	277,198
Collateralized loan obligations
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	109,167
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	109,078
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	109,167
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	109,078
Private label commercial MBS
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	1,250
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	19,475
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	1,206
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(18,285)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	20,725
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	19,491
SBA securities
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	2,431
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	11,486
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	2,312
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(10,599)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	13,917
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	12,911
Private Label Collateralized Mortgage Obligations
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	190,508
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(153,412)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	190,508
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	153,412
Asset-backed Securities
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	18,906
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	0
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(18,908)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	18,906
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 18,908

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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