Debt Securities - Additional Information (Details) $ in Thousands	Mar. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Available for Sale
Debt securities with gross unrealized or unrecognized losses, fair value | $	$ 2,339,952	$ 2,439,533
Gross unrealized or unrecognized losses on debt securities | $	$ 280,583	$ 311,204
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	12.00%	12.80%
Count of debt securities | security	1,058	1,091
Count of debt securities in an unrealized or unrecognized loss position | security	947	1,032
Held to Maturity
Debt securities with gross unrealized or unrecognized losses, fair value | $	$ 780,653	$ 785,295
Gross unrealized or unrecognized losses on debt securities | $	$ 126,906	$ 133,017
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	16.30%	16.90%
Count of debt securities | security	55	55
Count of debt securities in an unrealized or unrecognized loss position | security	55	55
Total
Debt securities with gross unrealized or unrecognized losses, fair value | $	$ 3,120,605	$ 3,224,828
Gross unrealized or unrecognized losses on debt securities | $	$ 407,489	$ 444,221
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	13.10%	13.80%
Count of debt securities | security	1,113	1,146
Count of debt securities in an unrealized or unrecognized loss position | security	1,002	1,087