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Investment Securities - Contractual Maturities of Securities Available-for-Sale (Details) $ in Thousands	Sep. 30, 2025 USD ($)
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	$ 6,750
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	77,989
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	349,496
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	2,200,526
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	6,750
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	77,466
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	330,518
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	2,012,000
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	2,634,761
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	2,426,734
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	991,290
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	844,155
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	991,290
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	844,155
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	40,100
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	11,912
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	40,134
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	10,748
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	52,012
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	50,882
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	14,093
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	780,404
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	14,271
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	767,711
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	794,497
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	781,982
Corporate debt securities
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	6,750
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	32,215
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	237,533
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	6,750
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	31,655
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	218,543
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	276,498
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	256,948
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	286,280
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	258,693
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	286,280
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	258,693
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	5,674
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	106,556
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	5,677
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	93,794
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	107,003
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	205,993
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	206,474
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	472
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	10,209
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	466
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	9,808
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	10,681
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	10,274
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	13,875
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	13,882
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	13,875
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	13,882
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	3,635
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	3,444
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	3,635
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 3,444

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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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