Investment Securities Available-For-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost
Due in one year or less	$ 235,741
Due after one year through five years	822,049
Due after five years through ten years	8,606
Due after ten years	19,704
Mortgage-backed securities	676,257
Total debt securities available-for-sale	1,762,357	$ 1,969,171
Contractual maturities of investments in debt securities available-for-sale, Fair Value
Due in one year or less	230,479
Due after one year through five years	765,724
Due after five years through ten years	8,158
Due after ten years	19,987
Mortgage-backed securities	598,252
Total debt securities available-for-sale	1,622,600	1,775,128
Accrued interest receivable on investment securities available-for-sale	$ 4,600	$ 5,980
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued income and other assets	Accrued income and other assets
U.S. Treasury and Federal agencies securities
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost
Total debt securities available-for-sale	$ 979,530	$ 1,090,743
Contractual maturities of investments in debt securities available-for-sale, Fair Value
Total debt securities available-for-sale	922,866	998,598
U.S. States and political subdivisions securities
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost
Total debt securities available-for-sale	97,522	130,670
Contractual maturities of investments in debt securities available-for-sale, Fair Value
Total debt securities available-for-sale	92,564	122,762
Mortgage-backed securities - Federal agencies
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost
Total debt securities available-for-sale	676,257	730,672
Contractual maturities of investments in debt securities available-for-sale, Fair Value
Total debt securities available-for-sale	598,252	637,058
Corporate debt securities
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost
Total debt securities available-for-sale	8,448	16,486
Contractual maturities of investments in debt securities available-for-sale, Fair Value
Total debt securities available-for-sale	8,329	16,131
Foreign government and other securities
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost
Total debt securities available-for-sale	600	600
Contractual maturities of investments in debt securities available-for-sale, Fair Value
Total debt securities available-for-sale	$ 589	$ 579