Income Taxes (Components Of The Net Deferred Tax (Liabilities) Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets, Gross [Abstract]
Allowance for credit losses	$ 86,120	$ 41,176
Operating lease liabilities	29,239	30,750
Accrued severance and deferred compensation	16,729	16,131
Accrued bonuses	9,002	6,993
Acquired loans	7,387	9,953
State taxes	6,707	5,906
Accrued reserves	6,193	2,379
Other	15,075	8,358
Total gross deferred tax assets	176,452	121,646
Deferred Tax Liabilities, Gross [Abstract]
Residential mortgage servicing rights	25,476	30,901
Direct financing leases	25,802	29,741
Operating lease liabilities	27,010	28,506
Fair market value adjustment on junior subordinated debentures	32,251	27,404
Deferred loan fees and costs	19,564	21,450
Goodwill	0	11,703
Unrealized gains on investment securities	35,234	8,014
Other	15,466	15,765
Total gross deferred tax liabilities	180,803	173,484
Valuation allowance	(1,090)	(1,090)
Deferred Tax Liabilities, Net	$ (5,441)	$ (52,928)