Loans - Information By Class Related To Individually Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Recorded Investment
Recorded Investment	$ 260,580		$ 260,580		$ 240,533
Unpaid Principal Balance
Unpaid Principal Balance	304,687		304,687		269,468
Related Allowance	25,598		25,598		28,814
Average Recorded Investment
Average Recorded Investment	280,655	$ 242,913	275,478	$ 246,566
Interest Income Recognized
Interest Income Recognized	1,420	1,610	4,485	4,824
Commercial
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	65,010		65,010		44,491
Impaired loans with related allowance recorded, Recorded investment	22,233		22,233		6,067
Recorded Investment	87,243		87,243		50,558
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	80,854		80,854		46,976
Impaired loans with related allowance recorded, Unpaid principal balance	27,428		27,428		6,879
Unpaid Principal Balance	108,282		108,282		53,855
Related Allowance	4,427		4,427		1,074
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	84,876	25,920	76,548	23,301
Impaired loans with related allowance recorded, Average recorded investment	17,539	19,534	13,992	19,510
Average Recorded Investment	102,415	45,454	90,540	42,811
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	176	215	560	598
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	4	5	13	5
Interest Income Recognized	180	220	573	603
Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	14,447		14,447		16,560
Impaired loans with related allowance recorded, Recorded investment	158,890		158,890		173,415
Recorded Investment	173,337		173,337		189,975
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	23,051		23,051		27,447
Impaired loans with related allowance recorded, Unpaid principal balance	173,354		173,354		188,166
Unpaid Principal Balance	196,405		196,405		215,613
Related Allowance	21,171		21,171		27,740
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	14,642	16,923	15,416	17,548
Impaired loans with related allowance recorded, Average recorded investment	163,598	180,536	169,522	186,207
Average Recorded Investment	178,240	197,459	184,938	203,755
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	1,240	1,390	3,912	4,221
Interest Income Recognized	1,240	1,390	3,912	4,221
Commercial, financial, and industrial | Commercial | General C&I
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	63,070		63,070		42,902
Impaired loans with related allowance recorded, Recorded investment	19,508		19,508		2,802
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	78,914		78,914		45,387
Impaired loans with related allowance recorded, Unpaid principal balance	23,728		23,728		2,802
Related Allowance	4,287		4,287		149
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	64,558	23,740	62,553	21,506
Impaired loans with related allowance recorded, Average recorded investment	14,620	16,375	10,892	16,038
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	173	203	530	561
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	4	0	4	0
Commercial, financial, and industrial | Commercial | Loans To Mortgage Companies
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	18,628	0	12,419	0
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0	0	0
Commercial, financial, and industrial | Commercial | TRUPs
Recorded Investment
Impaired loans with related allowance recorded, Recorded investment	2,725		2,725		2,888
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	3,700		3,700		3,700
Related Allowance	140		140		925
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	2,750	2,960	2,806	3,004
Interest Income Recognized
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0	0	0	0
Commercial real estate | Commercial | Income CRE
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	1,940		1,940		1,589
Impaired loans with related allowance recorded, Recorded investment	0		0		377
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	1,940		1,940		1,589
Impaired loans with related allowance recorded, Unpaid principal balance	0		0		377
Related Allowance	0		0		0
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	1,690	1,680	1,576	1,379
Impaired loans with related allowance recorded, Average recorded investment	169	199	294	335
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	3	12	30	37
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0	5	9	5
Commercial real estate | Commercial | Residential CRE
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	0	500	0	416
Impaired loans with related allowance recorded, Average recorded investment	0	0	0	133
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0	0	0	0
Consumer Real Estate | Consumer | HELOC
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	6,614		6,614		8,645
Impaired loans with related allowance recorded, Recorded investment	58,924		58,924		66,482
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	12,579		12,579		16,648
Impaired loans with related allowance recorded, Unpaid principal balance	62,514		62,514		69,610
Related Allowance	7,457		7,457		11,241
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	6,495	8,343	6,852	8,878
Impaired loans with related allowance recorded, Average recorded investment	60,312	68,913	62,650	70,452
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	449	556	1,475	1,711
Consumer Real Estate | Consumer | R/E Installment Loans
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	5,042		5,042		4,314
Impaired loans with related allowance recorded, Recorded investment	37,735		37,735		38,993
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	5,853		5,853		4,796
Impaired loans with related allowance recorded, Unpaid principal balance	38,714		38,714		39,851
Related Allowance	4,901		4,901		6,743
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	5,304	4,631	5,384	4,032
Impaired loans with related allowance recorded, Average recorded investment	39,924	39,147	41,475	40,512
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	250	246	792	764
Permanent Mortgage | Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	2,791		2,791		3,601
Impaired loans with related allowance recorded, Recorded investment	61,511		61,511		67,245
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	4,619		4,619		6,003
Impaired loans with related allowance recorded, Unpaid principal balance	71,406		71,406		78,010
Related Allowance	8,363		8,363		9,419
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	2,843	3,949	3,180	4,638
Impaired loans with related allowance recorded, Average recorded investment	62,652	71,898	64,700	74,617
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	0	0	0	0
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	537	585	1,632	1,737
Credit Card and Other | Consumer
Recorded Investment
Impaired loans with related allowance recorded, Recorded investment	720		720		695
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	720		720		695
Related Allowance	450		450		$ 337
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	710	578	697	626
Interest Income Recognized
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	$ 4	$ 3	$ 13	$ 9