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Investment Securities - Contractual Maturities of Securities Available-for-Sale (Details) $ in Thousands	Mar. 31, 2025 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	48,061
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	447,847
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	2,079,485
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	47,879
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	421,711
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(1,864,468)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	2,575,393
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	2,334,058
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	1,033,674
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	(867,042)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	1,033,674
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	867,042
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	39,959
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	9,994
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	12,173
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	39,928
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	9,983
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(11,293)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	62,126
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	61,204
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	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	14,655
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	565,021
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	14,775
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(550,293)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	579,676
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	565,068
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	602
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	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	597
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	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	602
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	597
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	7,500
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	281,577
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	7,354
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	256,049
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	289,077
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	263,403
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	136,918
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	106,567
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	136,471
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(106,414)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	243,485
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	242,885
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	580
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	11,953
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	571
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(10,875)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	12,533
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	11,446
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	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	4,123
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	3,862
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	4,123
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	3,862
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	334,859
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	(303,327)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	334,859
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	303,327
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	15,238
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	(15,224)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	15,238
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 15,224

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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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Fair value 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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