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Investment Securities - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Apr. 01, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Schedule of Available-for-sale Securities |  |  |
Within one year, amortized cost | $ 0 |  | $ 0
Within one year, estimated fair value | 0 |  | 0
After one year through five years, amortized cost | 0 |  | 3,690
After one year through five years, estimated fair value | 0 |  | 4,038
After five years through ten years, amortized cost | 45,918 |  | 99,615
After five years through ten years, estimated fair value | 38,383 |  | 101,498
After ten years, amortized cost | 165,710 |  | 419,635
After ten years, estimated fair value | 145,309 |  | 430,856
Total securities with single maturity date, amortized cost | 211,628 |  | 522,940
Total securities with single maturity date, estimated fair value | 183,692 |  | 536,392
Debt securities, amortized cost | 740,468 |  | 1,098,373
Available-for-sale investment securities | 648,825 |  | 1,109,208
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 0 |  | 0
Within one year, estimated fair value | 0 |  | 0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five | 132 |  | 0
After one year through five years, estimated fair value | 129 |  | 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value | 51,424 |  | 0
After five years through ten years, estimated fair value | 46,143 |  | 0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 140,448 |  | 0
After ten years, estimated fair value | 122,633 |  | 0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | 192,004 | $ 306,700 | 0
Debt Securities, Held-to-maturity, Fair Value | 168,905 |  | 0
Investment securities not due at a single maturity date, amortized cost | 305,107 |  | 0
Investment securities not due at a single maturity date, estimated fair value | 271,249 |  | 0
US Treasury Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | 9,990 |  | 9,988
Available-for-sale investment securities | 8,707 |  | 9,925
U.S. Government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Investment securities not due at a single maturity date, amortized cost | 107 |  | 373
Investment securities not due at a single maturity date, estimated fair value | 98 |  | 379
Debt securities, amortized cost | 107 |  | 373
Available-for-sale investment securities | 98 |  | 379
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |  |
Schedule of Available-for-sale Securities |  |  |
Investment securities not due at a single maturity date, amortized cost | 117,292 |  | 213,471
Investment securities not due at a single maturity date, estimated fair value | 109,493 |  | 214,439
Debt securities, amortized cost | 117,292 |  | 213,471
Available-for-sale investment securities | 109,493 |  | 214,439
Investment securities not due at a single maturity date, amortized cost | 10,430 |  | 0
Investment securities not due at a single maturity date, estimated fair value | 8,668 |  | 0
Private label residential mortgage and asset backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Investment securities not due at a single maturity date, amortized cost | 411,441 |  | 317,089
Investment securities not due at a single maturity date, estimated fair value | 355,542 |  | 313,220
Debt securities, amortized cost | 411,441 |  | 317,089
Available-for-sale investment securities | 355,542 |  | 313,220
Investment securities not due at a single maturity date, amortized cost | 56,691 |  | 0
Investment securities not due at a single maturity date, estimated fair value | 50,760 |  | 0
Corporate Debt Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Investment securities not due at a single maturity date, amortized cost | 0 |  | 44,500
Investment securities not due at a single maturity date, estimated fair value | 0 |  | 44,778
Debt securities, amortized cost |  |  | 44,500
Available-for-sale investment securities |  |  | 44,778
Investment securities not due at a single maturity date, amortized cost | 45,982 |  | 0
Investment securities not due at a single maturity date, estimated fair value | $ 42,916 |  | $ 0

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