Loans - Information By Class Related To Individually Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Recorded Investment
Recorded Investment	$ 300,726		$ 300,726		$ 240,533
Unpaid Principal Balance
Unpaid Principal Balance	333,311		333,311		269,468
Related Allowance	31,181		31,181		28,814
Average Recorded Investment
Average Recorded Investment	287,938	$ 242,130	272,890	$ 248,393
Interest Income Recognized
Interest Income Recognized	1,514	1,602	3,065	3,214
Commercial
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	104,741		104,741		44,491
Impaired loans with related allowance recorded, Recorded investment	12,844		12,844		6,067
Recorded Investment	117,585		117,585		50,558
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	112,175		112,175		46,976
Impaired loans with related allowance recorded, Unpaid principal balance	13,769		13,769		6,879
Unpaid Principal Balance	125,944		125,944		53,855
Related Allowance	8,484		8,484		1,074
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	87,446	26,990	72,384	21,991
Impaired loans with related allowance recorded, Average recorded investment	13,913	11,855	12,218	19,498
Average Recorded Investment	101,359	38,845	84,602	41,489
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	191	196	384	383
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0	0	9	0
Interest Income Recognized	191	196	393	383
Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	14,836		14,836		16,560
Impaired loans with related allowance recorded, Recorded investment	168,305		168,305		173,415
Recorded Investment	183,141		183,141		189,975
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	24,597		24,597		27,447
Impaired loans with related allowance recorded, Unpaid principal balance	182,770		182,770		188,166
Unpaid Principal Balance	207,367		207,367		215,613
Related Allowance	22,697		22,697		27,740
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	15,372	17,336	15,803	17,861
Impaired loans with related allowance recorded, Average recorded investment	171,207	185,949	172,485	189,043
Average Recorded Investment	186,579	203,285	188,288	206,904
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	1,323	1,406	2,672	2,831
Interest Income Recognized	1,323	1,406	2,672	2,831
Commercial, financial, and industrial | Commercial | General C&I
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	66,045		66,045		42,902
Impaired loans with related allowance recorded, Recorded investment	9,733		9,733		2,802
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	69,519		69,519		45,387
Impaired loans with related allowance recorded, Unpaid principal balance	9,732		9,732		2,802
Related Allowance	7,559		7,559		149
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	67,337	24,825	61,552	20,389
Impaired loans with related allowance recorded, Average recorded investment	10,760	8,850	9,026	15,870
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	178	183	357	358
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0	0	0	0
Commercial, financial, and industrial | Commercial | Loans To Mortgage Companies
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	37,256		37,256		0
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	41,216		41,216		0
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	18,628	0	9,314	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	2,774		2,774		2,888
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	3,700		3,700		3,700
Related Allowance	925		925		925
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	2,806	3,005	2,835	3,026
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	1,440		1,440		1,589
Impaired loans with related allowance recorded, Recorded investment	337		337		377
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	1,440		1,440		1,589
Impaired loans with related allowance recorded, Unpaid principal balance	337		337		377
Related Allowance	0		0		0
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	1,481	1,665	1,518	1,228
Impaired loans with related allowance recorded, Average recorded investment	347	0	357	403
Interest Income Recognized
Impaired loans with no related allowance recorded, Interest income recognized	13	13	27	25
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	0	0	9	0
Commercial real estate | Commercial | Residential C R E
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	0	500	0	374
Impaired loans with related allowance recorded, Average recorded investment	0	0	0	199
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 | Home Equity Line of Credit
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	6,377		6,377		8,645
Impaired loans with related allowance recorded, Recorded investment	61,702		61,702		66,482
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	13,178		13,178		16,648
Impaired loans with related allowance recorded, Unpaid principal balance	64,924		64,924		69,610
Related Allowance	8,247		8,247		11,241
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	6,462	9,034	7,030	9,145
Impaired loans with related allowance recorded, Average recorded investment	62,623	70,789	63,819	71,222
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	504	578	1,026	1,155
Consumer Real Estate | Consumer | R/E installment loans
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	5,565		5,565		4,314
Impaired loans with related allowance recorded, Recorded investment	42,112		42,112		38,993
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	6,489		6,489		4,796
Impaired loans with related allowance recorded, Unpaid principal balance	43,142		43,142		39,851
Related Allowance	5,832		5,832		6,743
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	5,738	3,553	5,425	3,733
Impaired loans with related allowance recorded, Average recorded investment	43,031	40,280	42,251	41,195
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	272	251	542	518
Permanent Mortgage | Consumer
Recorded Investment
Impaired loans with no related allowance recorded, Recorded investment	2,894		2,894		3,601
Impaired loans with related allowance recorded, Recorded investment	63,792		63,792		67,245
Unpaid Principal Balance
Impaired loans with no related allowance recorded, Unpaid principal balance	4,930		4,930		6,003
Impaired loans with related allowance recorded, Unpaid principal balance	74,005		74,005		78,010
Related Allowance	8,176		8,176		9,419
Average Recorded Investment
Impaired loans with no related allowance recorded, Average recorded investment	3,172	4,749	3,348	4,983
Impaired loans with related allowance recorded, Average recorded investment	64,861	74,227	65,724	75,976
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	543	574	1,095	1,152
Credit Card and Other | Consumer
Recorded Investment
Impaired loans with related allowance recorded, Recorded investment	699		699		695
Unpaid Principal Balance
Impaired loans with related allowance recorded, Unpaid principal balance	699		699		695
Related Allowance	442		442		$ 337
Average Recorded Investment
Impaired loans with related allowance recorded, Average recorded investment	692	653	691	650
Interest Income Recognized
Impaired Financing Impaired loans with related allowance recorded, Interest income recognized	$ 4	$ 3	$ 9	$ 6