Loans - Information By Class Related To Individually Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Recorded Investment
Recorded Investment	$ 275,148		$ 240,533
Unpaid Principal Balance
Unpaid Principal Balance	303,551		269,468
Related Allowance	27,806		28,814
Average Recorded Investment
Average Recorded Investment	257,841	$ 254,660
Interest Income Recognized
Interest Income Recognized	1,546	1,612
Commercial
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	70,151		44,491
Impaired loans with related allowance recorded, Recorded investment	14,981		6,067
Recorded Investment	85,132		50,558
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	72,623		46,976
Impaired loans with related allowance recorded, Unpaid principal balance	15,843		6,879
Unpaid Principal Balance	88,466		53,855
Related Allowance	3,437		1,074
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	57,321	16,993
Impaired loans with related allowance recorded, Average recorded investment	10,524	27,142
Average Recorded Investment	67,845	44,135
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	193	187
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	4	0
Interest Income Recognized	197	187
Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	15,907		16,560
Impaired loans with related allowance recorded, Recorded investment	174,109		173,415
Recorded Investment	190,016		189,975
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	26,413		27,447
Impaired loans with related allowance recorded, Unpaid principal balance	188,672		188,166
Unpaid Principal Balance	215,085		215,613
Related Allowance	24,369		27,740
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	16,234	18,388
Impaired loans with related allowance recorded, Average recorded investment	173,762	192,137
Average Recorded Investment	189,996	210,525
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	1,349	1,425
Interest Income Recognized	1,349	1,425
Commercial, financial, and industrial | Commercial | General C&I
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	68,629		42,902
Impaired loans with related allowance recorded, Recorded investment	11,786		2,802
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	71,101		45,387
Impaired loans with related allowance recorded, Unpaid principal balance	11,786		2,802
Related Allowance	2,512		149
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	55,765	15,954
Impaired loans with related allowance recorded, Average recorded investment	7,294	22,891
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	180	175
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0	0
Commercial, financial, and industrial | Commercial | TRUPs
Recorded Investment
Impaired loans with related allowance recorded, Recorded investment	2,838		2,888
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	3,700		3,700
Related Allowance	925		925
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	2,863	3,047
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	1,522		1,589
Impaired loans with related allowance recorded, Recorded investment	357		377
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	1,522		1,589
Impaired loans with related allowance recorded, Unpaid principal balance	357		377
Related Allowance	0		0
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	1,556	791
Impaired loans with related allowance recorded, Average recorded investment	367	806
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	13	12
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	4	0
Commercial real estate | Commercial | Residential C R E
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	0	248
Impaired loans with related allowance recorded, Average recorded investment	0	398
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	0	0
Consumer Real Estate | Consumer | Home Equity Line of Credit
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	6,548		8,645
Impaired loans with related allowance recorded, Recorded investment	63,546		66,482
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	13,869		16,648
Impaired loans with related allowance recorded, Unpaid principal balance	66,801		69,610
Related Allowance	8,378		11,241
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	7,597	9,257
Impaired loans with related allowance recorded, Average recorded investment	65,013	71,654
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	522	577
Consumer Real Estate | Consumer | R/E installment loans
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	5,910		4,314
Impaired loans with related allowance recorded, Recorded investment	43,949		38,993
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	6,693		4,796
Impaired loans with related allowance recorded, Unpaid principal balance	44,898		39,851
Related Allowance	6,464		6,743
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	5,112	3,914
Impaired loans with related allowance recorded, Average recorded investment	41,471	42,110
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	270	267
Permanent Mortgage | Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	3,449		3,601
Impaired loans with related allowance recorded, Recorded investment	65,930		67,245
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	5,851		6,003
Impaired loans with related allowance recorded, Unpaid principal balance	76,289		78,010
Related Allowance	9,081		9,419
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	3,525	5,217
Impaired loans with related allowance recorded, Average recorded investment	66,588	77,725
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	552	578
Credit Card and Other | Consumer
Recorded Investment
Impaired loans with related allowance recorded, Recorded investment	684		695
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	684		695
Related Allowance	446		$ 337
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	690	648
Interest Income Recognized
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	$ 5	$ 3