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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Securities to be held to maturity |  |  |  |  |
Amortized Cost |  | $ 387,806,000 |  | $ 393,896,000 | $ 381,906,000
Unrealized Gains |  | 20,000 |  | 200,000 | 86,000
Unrealized Losses |  | (75,962,000) |  | (55,085,000) | (68,196,000)
Fair Value (Estimated) |  | 311,864,000 |  | 339,011,000 | 313,796,000
Less allowance for credit losses |  | (432,000) | [1] | 0 | 0
Net securities to be held to maturity | [1] | 387,374,000 |  | 393,896,000 | 381,906,000
Restricted equity securities |  |  |  |  |
Federal Home Loan Bank Stock |  | 2,823,000 |  | 2,846,000 | 3,477,000
Federal Reserve Bank Stock |  | 1,037,000 |  | 1,037,000 | 1,037,000
Restricted equity securities |  | 3,860,000 |  | 3,883,000 | 4,514,000
U.S. Treasury & Agency securities |  |  |  |  |
Securities to be held to maturity |  |  |  |  |
Amortized Cost |  | 40,100,000 |  | 40,100,000 | 38,100,000
Unrealized Gains |  | 0 |  | 4,000 | 0
Unrealized Losses |  | (11,996,000) |  | (10,477,000) | (10,428,000)
Fair Value (Estimated) |  | 28,104,000 |  | 29,627,000 | 27,672,000
Less allowance for credit losses |  | 0 |  |  |
Mortgage-backed securities |  |  |  |  |
Securities to be held to maturity |  |  |  |  |
Amortized Cost |  | 57,224,000 |  | 60,497,000 | 56,423,000
Unrealized Gains |  | 4,000 |  | 42,000 | 48,000
Unrealized Losses |  | (13,336,000) |  | (11,392,000) | (11,784,000)
Fair Value (Estimated) |  | 43,892,000 |  | 49,147,000 | 44,687,000
State and political subdivisions |  |  |  |  |
Securities to be held to maturity |  |  |  |  |
Amortized Cost |  | 255,732,000 |  | 258,549,000 | 257,633,000
Unrealized Gains |  | 16,000 |  | 154,000 | 38,000
Unrealized Losses |  | (46,807,000) |  | (30,733,000) | (43,899,000)
Fair Value (Estimated) |  | 208,941,000 |  | 227,970,000 | 213,772,000
Less allowance for credit losses |  | (212,000) |  | 0 |
Corporate securities |  |  |  |  |
Securities to be held to maturity |  |  |  |  |
Amortized Cost |  | 34,750,000 |  | 34,750,000 | 29,750,000
Unrealized Gains |  | 0 |  | 0 | 0
Unrealized Losses |  | (3,823,000) |  | (2,483,000) | (2,085,000)
Fair Value (Estimated) |  | 30,927,000 |  | 32,267,000 | $ 27,665,000
Less allowance for credit losses |  | $ (220,000) |  | $ 0 |
[1] | December 31, 2022 and September 30, 2022 had no allowance for credit losses

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