Investments in Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available-for-Sale - Amortized cost
After four through five years	$ 245
After five through fifteen years	6,761
After fifteen years	53,661
Securities not due on a single maturity date	492,547
Available-for-sale Securities, Amortized Cost, Total	553,214
Available-for-Sale - Fair Value
After four through five years	245
After five through fifteen years	6,565
After fifteen years	50,685
Securities not due on a single maturity date	433,097
Available-for-sale Securities, Fair Value, Total	490,592	$ 501,032
Held-to-Maturity - Amortized Carrying Value
After five through fifteen years	2,578
After fifteen years	3,649
Securities not due on a single maturity date	196,268
Held-to-Maturity, Amortized Carrying Value, Total	202,495	$ 0
Held-to-Maturity - Fair Value
After five through fifteen years	2,233
After fifteen years	3,213
Securities not due on a single maturity date	172,319
Held-to-maturity, Fair Value, Total	$ 177,765