Investment Securities - Contractual Maturities of Securities Available-for-Sale (Details) $ in Thousands	Mar. 31, 2026 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	110,123
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	292,196
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	2,455,584
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	108,085
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	279,336
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	2,268,911
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	2,857,903
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	2,656,332
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	951,650
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
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	811,661
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	951,650
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	811,661
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	40,235
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	11,795
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	40,150
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	0
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	10,831
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	52,030
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	50,981
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	13,353
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	1,109,505
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	13,555
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,090,628
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	1,122,858
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	1,104,183
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	69,888
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	176,587
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	67,935
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	164,023
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	246,475
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	231,958
Private label 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	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	259,984
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
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	233,184
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	259,984
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	233,184
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	93,763
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	106,543
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	93,744
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	106,630
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	200,306
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	200,374
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	5,272
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	3,470
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	4,954
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	3,316
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	8,742
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	8,270
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	12,637
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
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	12,661
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	12,637
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	12,661
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	3,221
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	3,060
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	3,221
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 3,060

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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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 second through fifth 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 second through fifth 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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