Income Taxes Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for credit losses	$ 62,465	$ 67,059
Tax credit carryforwards	27,192	39,294
State loss carryforwards	23,996	20,401
Lease Liability	21,034	0
Tax credit investments	11,203	10,159
Other accrued expenses	10,633	9,801
Deferred compensation	9,190	8,486
Stock-based compensation	3,499	3,289
Postretirement and defined benefit plans	0	1,553
Other	7,348	12,107
Total gross deferred tax assets	176,560	172,149
Deferred tax liabilities:
Equipment lease financing	41,049	44,216
Right-of-use-asset	18,671	0
Unrealized holding gains on AFS securities	10,432	23,978
Premises and equipment	9,151	8,876
MSRs	8,016	6,414
Acquisition premiums/discounts	5,466	5,466
Intangible assets	1,272	1,205
Postretirement and defined benefit plans	1,243	0
Other	13,492	15,811
Total gross deferred tax liabilities	108,792	105,966
Net deferred tax asset, before valuation allowance	67,768	66,183
Valuation allowance	(23,996)	(20,401)
Net deferred tax asset	43,772	45,782
State and local operating loss carryforwards	306,900	263,600
Tax credits and benefits	$ (28,141)	$ (32,940)	$ (35,184)