Investment Securities - Contractual Maturities of Securities Available-for-Sale (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	$ 4,958
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	942,581
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	1,310,190
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	3,258,094
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year	4,959
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	833,791
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	1,121,134
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(2,748,635)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	5,515,823
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	4,708,519
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	2,592,344
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	(2,168,613)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	2,592,344
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	2,168,613
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	202,143
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	320,570
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	17,736
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	185,585
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	277,605
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(16,767)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	540,449
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	479,957
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	172,382
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	327,719
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	149,975
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(289,252)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	500,101
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	439,227
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	65,454
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	307,486
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	22,260
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	58,119
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	264,120
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(20,550)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	395,200
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	342,789
U.S. Treasury securities
Schedule of Investments [Line Items]
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due Within One Year	4,958
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After One Year Through Five Years	666,576
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Five Years Through Ten Years	99,692
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	4,959
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due Within One Year Through Five Years	582,194
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	85,930
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	771,226
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	673,083
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	339,730
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	4,725
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Five Years Through Ten Years	275,788
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	344,730
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	280,513
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	70,330
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	38,838
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	67,716
Contractual Maturities of Securities Available-for-Sale, Fair Value, Due After Ten Years	(37,107)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	109,168
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	104,823
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	0
Contractual Maturities of Securities Available-for-Sale, Amortized Cost, Due After Ten Years	25,137
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	(23,200)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	25,137
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	23,200
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	3,408
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	12,952
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	3,168
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	(11,914)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	16,360
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	15,082
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	198,992
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	(159,507)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	198,992
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	159,507
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	22,116
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	(21,725)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	22,116
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 21,725