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Investment Securities - Investments by contractual maturity (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 01, 2022
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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 | 9,992,000 | 0 |
After one year through five years, estimated fair value | 8,954,000 | 0 |
After five years through ten years, amortized cost | 40,264,000 | 45,918,000 |
After five years through ten years, estimated fair value | 35,379,000 | 38,383,000 |
After ten years, amortized cost | 157,804,000 | 165,710,000 |
After ten years, estimated fair value | 144,843,000 | 145,309,000 |
Debt securities, amortized cost | 669,646,000 | 740,468,000 |
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 | 597,196,000 | 648,825,000 |
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 | 8,463,000 | 132,000 |
After one year through five years, estimated fair value | 8,136,000 | 129,000 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value | 74,746,000 | 51,424,000 |
After five years through ten years, estimated fair value | 68,552,000 | 46,143,000 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 108,861,000 | 140,448,000 |
After ten years, estimated fair value | 101,264,000 | 122,633,000 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | 177,952,000 | 168,905,000 | $ 306,700,000
Investment securities not due at a single maturity date, amortized cost | 302,442,000 | 305,107,000 |
Investment securities not due at a single maturity date, estimated fair value | 277,003,000 | 271,249,000 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost | 192,070,000 | 192,004,000 |
Debt Securities, Held-to-Maturity, Amortized Cost, Before Allowance For Credit Loss, Maturity, Without Single Maturity Date | 303,493,000 | 305,107,000 |
Available-for-sale Securities, Debt Maturities, with Single Maturity Date, Fair Value | 189,176,000 | 183,692,000 |
Available-for-sale Securities, Debt Maturities, with Single Maturity Date, Amortized Cost Basis | 208,060,000 | 211,628,000 |
External Credit Rating, Not Rated |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 24,158 |  |
External Credit Rating, BBB/BB/B Rating |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 30,173 |  |
External Credit Rating, AAA/AA/A Rating |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 238,404 |  |
US Treasury Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | 9,990,000 | 9,990,000 |
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 | 8,954,000 | 8,707,000 |
U.S. Government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Investment securities not due at a single maturity date, amortized cost | 102,000 | 107,000 |
Investment securities not due at a single maturity date, estimated fair value | 95,000 | 98,000 |
Debt securities, amortized cost | 102,000 | 107,000 |
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 | 95,000 | 98,000 |
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 | 88,874,000 | 117,292,000 |
Investment securities not due at a single maturity date, estimated fair value | 83,352,000 | 109,493,000 |
Debt securities, amortized cost | 88,874,000 | 117,292,000 |
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 | 83,352,000 | 109,493,000 |
Investment securities not due at a single maturity date, amortized cost | 10,758,000 | 10,430,000 |
Investment securities not due at a single maturity date, estimated fair value | 9,066,000 | 8,668,000 |
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 | 372,610,000 | 411,441,000 |
Investment securities not due at a single maturity date, estimated fair value | 324,573,000 | 355,542,000 |
Debt securities, amortized cost | 372,610,000 | 411,441,000 |
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 | 324,573,000 | 355,542,000 |
Investment securities not due at a single maturity date, amortized cost | 54,579,000 | 56,691,000 |
Investment securities not due at a single maturity date, estimated fair value | 48,635,000 | 50,760,000 |
Private label residential mortgage and asset backed securities | External Credit Rating, Not Rated |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 8,245 |  |
Private label residential mortgage and asset backed securities | External Credit Rating, BBB/BB/B Rating |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  |
Private label residential mortgage and asset backed securities | External Credit Rating, AAA/AA/A Rating |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 46,334 |  |
Corporate Debt Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost |  | 0 |
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 |  | 0 |
Investment securities not due at a single maturity date, amortized cost | 46,086,000 | 45,982,000 |
Investment securities not due at a single maturity date, estimated fair value | 41,350,000 | 42,916,000 |
Corporate Debt Securities | External Credit Rating, Not Rated |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 15,913 |  |
Corporate Debt Securities | External Credit Rating, BBB/BB/B Rating |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 30,173 |  |
Corporate Debt Securities | External Credit Rating, AAA/AA/A Rating |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  |
Obligations of states and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | 198,070,000 | 201,638,000 |
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 | 180,222,000 | 174,985,000 |
Investment securities not due at a single maturity date, amortized cost | 192,070,000 | 192,004,000 |
Investment securities not due at a single maturity date, estimated fair value | 177,952,000 | $ 168,905,000 |
Obligations of states and political subdivisions | External Credit Rating, Not Rated |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  |
Obligations of states and political subdivisions | External Credit Rating, BBB/BB/B Rating |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  |
Obligations of states and political subdivisions | External Credit Rating, AAA/AA/A Rating |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | $ 192,070 |  |

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