Parent Company Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets:
Other Assets		$ 512,712		$ 527,716
Total assets		19,347,373		19,294,174
Liabilities and stockholders’ equity
Subordinated debentures (less unamortized debt issuance costs of $20 and $115)		49,980		49,885
Other liabilities		368,196		415,089
Total liabilities		16,452,122		16,407,473
Total stockholders' equity		2,895,251		2,886,701	$ 3,018,449	$ 1,702,685
Liabilities and Equity		19,347,373		19,294,174
Parent Company [Member]
Assets:
Cash		108,788	[1]	169,977
Investments in subsidiaries	[2]	2,922,698		2,850,407
Prepaid income taxes		2,488		2,299
Deferred tax asset		429		453
Other Assets		0		2,297
Total assets		3,034,403		3,025,433
Liabilities and stockholders’ equity
Dividends payable		23,580		25,103
Junior subordinated debentures (less unamortized debt issuance costs of $30 and $33)		62,858		62,855
Subordinated debentures (less unamortized debt issuance costs of $20 and $115)		49,980		49,885
Other liabilities		2,734		889
Total liabilities		139,152		138,732
Total stockholders' equity		2,895,251		2,886,701
Liabilities and Equity		3,034,403		3,025,433
Parent Company [Member] | Junior Subordinated Debt [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		30		33
Subordinated Debt [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		20		115
Subordinated Debt [Member] | Parent Company [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		$ 20		$ 115

[1] Entire balance eliminates in consolidation.

[2] Majority of balance eliminates in consolidation