Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Federal Home Loan Bank and Federal Reserve Bank Stock	$ 33,340	$ 34,093
Derivative Financial Instruments	96,167	28,931
Low-Income Housing and Other Equity Investments	142,961	84,618
Deferred Compensation Plan Assets	53,410	41,464
Prepaid Expenses	14,517	15,140
Accounts Receivable	12,380	20,180
Deferred Tax Assets	16,724
Other	65,794	48,248
Total Other Assets	$ 435,293	$ 272,674