Loans - Information By Class Related To Individually Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Recorded Investment
Recorded Investment	$ 246,900	$ 240,533
Unpaid Principal Balance
Unpaid Principal Balance	281,089	269,468
Related Allowance	25,916	28,814
Average Recorded Investment
Average Recorded Investment	270,043	246,386
Interest Income Recognized
Interest Income Recognized	5,787	6,419
Commercial
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	54,235	44,491
Impaired loans with related allowance recorded, Recorded investment	29,766	6,067
Recorded Investment	84,001	50,558
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	65,165	46,976
Impaired loans with related allowance recorded, Unpaid principal balance	31,536	6,879
Unpaid Principal Balance	96,701	53,855
Related Allowance	6,196	1,074
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	72,316	25,994
Impaired loans with related allowance recorded, Average recorded investment	16,994	19,439
Average Recorded Investment	89,310	45,433
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	723	808
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	13	10
Interest Income Recognized	736	818
Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	12,533	16,560
Impaired loans with related allowance recorded, Recorded investment	150,366	173,415
Recorded Investment	162,899	189,975
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	20,492	27,447
Impaired loans with related allowance recorded, Unpaid principal balance	163,896	188,166
Unpaid Principal Balance	184,388	215,613
Related Allowance	19,720	27,740
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	14,934	17,415
Impaired loans with related allowance recorded, Average recorded investment	165,799	183,538
Average Recorded Investment	180,733	200,953
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	5,051	5,601
Interest Income Recognized	5,051	5,601
Commercial, financial, and industrial | Commercial | General C&I
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	52,672	42,902
Impaired loans with related allowance recorded, Recorded investment	29,766	2,802
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	63,602	45,387
Impaired loans with related allowance recorded, Unpaid principal balance	31,536	2,802
Related Allowance	6,196	149
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	61,382	24,186
Impaired loans with related allowance recorded, Average recorded investment	14,328	16,011
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	690	757
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	4	0
Commercial, financial, and industrial | Commercial | Loans to mortgage companies
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	0
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	0
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	9,314
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0
Commercial, financial, and industrial | Commercial | TRUPs
Recorded Investment
Impaired loans with related allowance recorded, Recorded investment	0	2,888
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	0	3,700
Related Allowance	0	925
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	2,445	2,981
Interest Income Recognized
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0	0
Commercial real estate | Commercial | Income CRE
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	1,563	1,589
Impaired loans with related allowance recorded, Recorded investment	0	377
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	1,563	1,589
Impaired loans with related allowance recorded, Unpaid principal balance	0	377
Related Allowance	0	0
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	1,620	1,434
Impaired loans with related allowance recorded, Average recorded investment	221	348
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	33	51
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	9	10
Commercial real estate | Commercial | Residential C R E
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment		0
Impaired loans with related allowance recorded, Recorded investment		0
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance		0
Impaired loans with related allowance recorded, Unpaid principal balance		0
Related Allowance		0
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment		374
Impaired loans with related allowance recorded, Average recorded investment		99
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized		0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized		0
Consumer real estate | Consumer | Home Equity Line of Credit
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	4,940	8,645
Impaired loans with related allowance recorded, Recorded investment	55,522	66,482
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	10,438	16,648
Impaired loans with related allowance recorded, Unpaid principal balance	59,122	69,610
Related Allowance	7,016	11,241
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	6,582	8,723
Impaired loans with related allowance recorded, Average recorded investment	61,294	69,535
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	1,868	2,273
Consumer real estate | Consumer | R/E installment loans
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	5,329	4,314
Impaired loans with related allowance recorded, Recorded investment	34,862	38,993
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	6,105	4,796
Impaired loans with related allowance recorded, Unpaid principal balance	35,780	39,851
Related Allowance	4,521	6,743
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	5,335	4,300
Impaired loans with related allowance recorded, Average recorded investment	40,181	40,118
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	1,016	1,024
Permanent Mortgage | Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	2,264	3,601
Impaired loans with related allowance recorded, Recorded investment	59,329	67,245
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	3,949	6,003
Impaired loans with related allowance recorded, Unpaid principal balance	68,341	78,010
Related Allowance	7,761	9,419
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	3,017	4,392
Impaired loans with related allowance recorded, Average recorded investment	63,630	73,259
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	2,149	2,290
Credit card & other | Consumer
Recorded Investment
Impaired loans with related allowance recorded, Recorded investment	653	695
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	653	695
Related Allowance	422	337
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	694	626
Interest Income Recognized
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	$ 18	$ 14