Other Income And Other Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
All other income and commissions:
Deferred compensation	$ 8,171	$ 1,938	$ (1,336)	$ 7,412
Other service charges	4,582	5,624	9,801	9,493
Mortgage banking	4,138	2,572	6,569	4,458
ATM and interchange fees	4,009	4,262	8,221	7,503
Letter of credit fees	1,559	1,253	3,021	2,621
Electronic banking fees	1,182	1,267	2,212	2,538
Dividend income	1,057	1,809	2,187	4,122
Insurance commissions	401	566	1,190	1,190
Gain/(loss) on extinguishment of debt	0	0	0	(1)
Other	4,890	6,376	12,488	10,962
Total	29,989	25,667	44,353	50,298
All other expense:
Expense/(Credit) on unfunded commitments	11,158	(489)	20,388	(93)
Non-service components of net periodic pension and post-retirement cost	2,961	559	5,469	991
Other insurance and taxes	2,599	2,495	5,278	5,189
Miscellaneous loan costs	2,356	857	3,450	1,884
Supplies	1,933	1,342	4,344	3,146
Employee training and dues	654	1,251	1,995	2,708
Customer relations	632	1,540	2,636	3,139
Travel and entertainment	474	2,906	3,183	5,618
OREO	437	25	253	(341)
Tax credit investments	426	267	772	942
Litigation and regulatory matters (c)	(3)	8,230	(16)	8,217
Other	12,118	26,158	21,193	33,046
Total	35,751	28,681	68,977	48,012
Non-Strategic
All other income and commissions:
Total	$ 710	567	$ 1,506	1,515
All other expense:
Litigation and regulatory matters (c)		$ 8,300		$ 8,300