Other Income And Other Expense (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
All other income and commissions:
Other service charges	$ 5,738		$ 3,758	$ 15,231	$ 11,609
ATM and interchange fees	4,507		3,263	12,010	9,943
Mortgage banking	2,019		2,533	6,477	7,510
Dividend income	1,556		2,757	5,678	8,130
Letter of credit fees	1,400		1,307	4,021	3,851
Electronic banking fees	1,288		1,309	3,826	3,741
Insurance commissions	577		396	1,767	1,629
Deferred compensation	472		1,458	7,884	2,900
Gain/(loss) on extinguishment of debt	(6)		(1)	(7)	(1)
Other	9,299		5,009	20,261	14,244
Total	26,850		21,789	77,148	63,556
All other expense:
Litigation and regulatory matters	(11,534)		1,541	(3,317)	(609)
Customer relations	3,165		1,328	6,304	3,749
Travel and entertainment	2,849		3,988	8,467	12,102
Other insurance and taxes	2,475		2,761	7,664	8,178
Supplies	1,668		1,635	4,814	5,458
Miscellaneous loan costs	1,017		543	2,901	2,720
Employee training and dues	1,003		1,682	3,711	5,310
Non-service components of net periodic pension and post-retirement cost	986		1,585	1,977	3,619
Tax credit investments	407		1,370	1,349	3,586
OREO	342		1,256	1	2,174
Other	14,231		11,094	48,169	64,527
Total	39,677		25,701	88,674	112,032
Non-Strategic
All other income and commissions:
Total	$ 819		$ 863	2,398	$ 1,177
All other expense:
Litigation and regulatory matters		$ (8,300)		$ 8,300