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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 01, 2022
--- | --- | --- | ---
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | $ 669,646 | $ 740,468 |
Available-for-sale Securities, Gross Unrealized Gains | 13 | 18 |
Available-for-sale Securities, Gross Unrealized Losses | (72,463) | (91,661) |
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 | 648,825 |
Investment securities not due at a single maturity date, amortized cost | 302,442 | 305,107 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 70 | 67 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (26,560) | (33,925) | $ (25,300)
Investment securities not due at a single maturity date, estimated fair value | 277,003 | 271,249 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | 1,051 |  |
Securities Pledged as Collateral |  |  |
Schedule of Available-for-sale Securities |  |  |
Investment securities not due at a single maturity date, amortized cost | 303,493 |  |
US Treasury Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 9,990 | 9,990 |
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0 |
Available-for-sale Securities, Gross Unrealized Losses | (1,036) | (1,283) |
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 | 8,707 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  |
U.S. Government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 102 | 107 |
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0 |
Available-for-sale Securities, Gross Unrealized Losses | (7) | (9) |
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 | 98 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  |
Obligations of states and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 198,070 | 201,638 |
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0 |
Available-for-sale Securities, Gross Unrealized Losses | (17,848) | (26,653) |
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 | 174,985 |
Investment securities not due at a single maturity date, amortized cost | 192,070 | 192,004 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 70 | 67 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (14,188) | (23,166) |
Investment securities not due at a single maturity date, estimated fair value | 177,952 | 168,905 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | 20 |  |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 88,874 | 117,292 |
Available-for-sale Securities, Gross Unrealized Gains | 3 | 4 |
Available-for-sale Securities, Gross Unrealized Losses | (5,525) | (7,803) |
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 | 109,493 |
Investment securities not due at a single maturity date, amortized cost | 10,758 | 10,430 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1,692) | (1,762) |
Investment securities not due at a single maturity date, estimated fair value | 9,066 | 8,668 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | 0 |  |
Private label residential mortgage and asset backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 372,610 | 411,441 |
Available-for-sale Securities, Gross Unrealized Gains | 10 | 14 |
Available-for-sale Securities, Gross Unrealized Losses | (48,047) | (55,913) |
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 | 355,542 |
Investment securities not due at a single maturity date, amortized cost | 54,579 | 56,691 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (5,944) | (5,931) |
Investment securities not due at a single maturity date, estimated fair value | 48,635 | 50,760 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | 11 |  |
Corporate Debt Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost |  | 0 |
Available-for-sale Securities, Gross Unrealized Gains |  | 0 |
Available-for-sale Securities, Gross Unrealized Losses |  | 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 | 45,982 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (4,736) | (3,066) |
Investment securities not due at a single maturity date, estimated fair value | 41,350 | $ 42,916 |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | $ 1,020 |  |

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