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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Amortized cost	$ 1,491,440
Fair Value	1,356,142	$ 894,335
Investment securities held to maturity, at amortized cost, net (fair value of $677,335 and $376,331, respectively)	773,319	383,393
Total investment securities	677,335	376,331
Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Fair Value	1,356,142	894,335
Level 2 | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	1,491,440	883,832
Gross Unrealized Gains	105	15,341
Gross Unrealized Losses	(135,403)	(4,838)
Fair Value	1,336,372	894,335
Investment securities held to maturity, at amortized cost, net (fair value of $677,335 and $376,331, respectively)	773,319	383,393
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	120
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(95,984)	(7,182)
Total investment securities	677,335	376,331
U.S. government and agency securities | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Fair Value	63,749	21,373
U.S. government and agency securities | Level 2 | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	68,912	21,494
Gross Unrealized Gains	0	55
Gross Unrealized Losses	(5,163)	(176)
Fair Value	43,979	21,373
Investment securities held to maturity, at amortized cost, net (fair value of $677,335 and $376,331, respectively)	150,948	141,011
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	120
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(32,916)	(1,768)
Total investment securities	118,032	139,363
Municipal securities | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Fair Value	185,713	221,212
Municipal securities | Level 2 | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	206,767	213,158
Gross Unrealized Gains	51	8,908
Gross Unrealized Losses	(21,105)	(854)
Fair Value	185,713	221,212
Residential CMO and MBS | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Fair Value	438,370	306,884
Residential CMO and MBS | Level 2 | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	494,330	307,366
Gross Unrealized Gains	6	2,111
Gross Unrealized Losses	(55,966)	(2,593)
Fair Value	438,370	306,884
Investment securities held to maturity, at amortized cost, net (fair value of $677,335 and $376,331, respectively)	296,432	24,529
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(19,168)	(153)
Total investment securities	277,264	24,376
Commercial CMO and MBS | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Fair Value	639,441	315,861
Commercial CMO and MBS | Level 2 | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	691,836	313,169
Gross Unrealized Gains	29	3,891
Gross Unrealized Losses	(52,424)	(1,199)
Fair Value	639,441	315,861
Investment securities held to maturity, at amortized cost, net (fair value of $677,335 and $376,331, respectively)	325,939	217,853
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(43,900)	(5,261)
Total investment securities	282,039	212,592
Corporate obligations | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Fair Value	5,834	2,014
Corporate obligations | Level 2 | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	6,001	2,007
Gross Unrealized Gains	0	7
Gross Unrealized Losses	(167)	0
Fair Value	5,834	2,014
Other asset-backed securities | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Fair Value	23,035	26,991
Other asset-backed securities | Level 2 | Fair Value, Recurring [Member]
Investment Holdings [Line Items]
Amortized cost	23,594	26,638
Gross Unrealized Gains	19	369
Gross Unrealized Losses	(578)	(16)
Fair Value	$ 23,035	$ 26,991

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