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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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