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Securities - Available-for-Sale and Held-to-Maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Securities held-to-maturity, Amortized Cost, Due after ten years | $ 66,548 |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 74,413 |  |  |  |  |
Securities held-to-maturity, Allowance for credit losses | (1,079) | $ (1,087) | $ (1,100) | $ (1,085) | $ (986) | $ (862)
Securities held-to-maturity | 73,334 |  | 73,711 |  |  |
Securities held-to-maturity, Fair Value, Due after ten years | 57,326 |  |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 64,337 |  | 62,550 |  |  |
Securities available-for-sale, Amortized Cost, Due in one year or less | 59,888 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after one years through five years | 74,823 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after five years through ten years | 255,416 |  |  |  |  |
Securities available-for-sale, Amortized Cost, Due after ten years | 130,212 |  |  |  |  |
Securities available-for-sale | 967,095 |  |  |  |  |
Securities available for sale, Fair Value, Due in one year or less | 58,498 |  |  |  |  |
Securities available for sale, Fair Value, Due after one years through five years | 69,033 |  |  |  |  |
Securities available for sale, Fair Value, Due after five years through ten years | 235,696 |  |  |  |  |
Securities available for sale, Fair Value, Due after ten years | 129,072 |  |  |  |  |
Securities, available-for-sale, Fair Value | 869,556 |  | 735,357 |  |  |
Basis adjustments | 6,625 |  |  |  |  |
Designated as Hedging Instrument [Member] | Portfolio Layer Hedges on Closed Portfolio of Securities Available for Sale [Member] |  |  |  |  |  |
Basis adjustments | 5,500 |  |  |  |  |
Total Other Securities [Member] |  |  |  |  |  |
Securities, held-to-maturity, Amortized Cost, With single maturity date | 66,548 |  |  |  |  |
Securities held-to-maturity, Fair Value, With single maturity date | 57,326 |  |  |  |  |
Securities available-for-sale, Amortized Cost, With single maturity date | 520,339 |  |  |  |  |
Securities available-for-sale, Fair Value, With single maturity date | 492,299 |  |  |  |  |
Collateralized Mortgage Backed Securities |  |  |  |  |  |
Securities held-to-maturity, Amortized Cost, Without single maturity | 7,865 |  |  |  |  |
Securities, held-to-maturity, Amortized Cost | 7,865 |  | 7,875 |  |  |
Securities held-to-maturity, Fair Value, Without single maturity date | 7,011 |  |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 7,011 |  | 6,989 |  |  |
Securities, available-for-sale, Amortized Cost, Without single maturity date | 435,410 |  |  |  |  |
Securities available-for-sale | 435,410 |  |  |  |  |
Securities available-for-sale, Fair Value, Without single maturity date | 365,911 |  |  |  |  |
Securities, available-for-sale, Fair Value | 365,911 |  | 384,283 |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities, available-for-sale, Amortized Cost, Without single maturity date | 11,346 |  |  |  |  |
Securities available-for-sale | 11,346 |  |  |  |  |
Securities available-for-sale, Fair Value, Without single maturity date | 11,346 |  |  |  |  |
Securities, available-for-sale, Fair Value | $ 11,346 |  | $ 11,211 |  |  |

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