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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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