Loans and Leases Loans and Leases (Credit Rating) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	$ 33,180,851	$ 32,791,975
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,207,869	8,459,531
2020	7,728,147	4,217,219
2019	4,060,239	2,787,346
2018	2,552,670	2,053,335
2017	1,890,073	1,647,878
Prior	3,510,422	2,238,335
Revolving	1,140,955	1,147,519
Revolving converted to term loans	6,927	6,897
Total loans and leases	23,097,302	22,558,060
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	740,559	2,679,097
2020	2,555,865	1,444,947
2019	1,271,931	929,030
2018	791,020	728,918
2017	629,500	536,569
Prior	1,297,619	951,150
Revolving	2,206,721	2,339,505
Revolving converted to term loans	157,561	161,817
Total loans and leases	9,650,776	9,771,033
Consumer And PCD Portfolio Segments
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,948,428	11,172,270
2020	10,313,757	5,690,922
2019	5,359,399	3,749,427
2018	3,375,272	2,812,829
2017	2,546,743	2,215,777
Prior	5,091,470	3,458,369
Revolving	3,359,588	3,500,512
Revolving converted to term loans	186,194	191,869
Total loans and leases	33,180,851	32,791,975
Construction and land development | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	46,039	342,658
2020	399,629	341,862
2019	311,343	198,300
2018	170,162	56,118
2017	53,344	23,977
Prior	28,877	11,387
Revolving	12,693	11,122
Revolving converted to term loans	0	0
Total loans and leases	1,022,087	985,424
Construction and land development | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	46,039	342,183
2020	399,172	341,233
2019	310,753	190,429
2018	168,534	50,776
2017	48,089	23,969
Prior	28,797	11,306
Revolving	12,548	10,969
Revolving converted to term loans	0	0
Total loans and leases	1,013,932	970,865
Construction and land development | Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	246
2020	232	0
2019	0	6,421
2018	181	5,342
2017	85	0
Prior	0	0
Revolving	145	153
Revolving converted to term loans	0	0
Total loans and leases	643	12,162
Construction and land development | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	229
2020	225	629
2019	590	1,450
2018	1,447	0
2017	5,170	8
Prior	80	81
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	7,512	2,397
Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	40,360	215,112
2020	210,592	86,127
2019	52,559	24,981
2018	17,003	10,648
2017	8,492	6,093
Prior	5,484	2,637
Revolving	1,575	2,525
Revolving converted to term loans	0	0
Total loans and leases	336,065	348,123
Owner occupied commercial mortgage | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	636,490	3,200,021
2020	3,222,562	2,240,919
2019	2,210,881	1,671,722
2018	1,571,041	1,334,727
2017	1,245,547	1,081,293
Prior	2,336,723	1,521,016
Revolving	117,549	115,109
Revolving converted to term loans	173	205
Total loans and leases	11,340,966	11,165,012
Owner occupied commercial mortgage | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	632,239	3,183,467
2020	3,202,842	2,201,165
2019	2,166,465	1,625,141
2018	1,521,886	1,301,412
2017	1,206,771	1,049,858
Prior	2,249,426	1,454,020
Revolving	106,579	101,556
Revolving converted to term loans	101	133
Total loans and leases	11,086,309	10,916,752
Owner occupied commercial mortgage | Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	687	6,274
2020	10,398	20,702
2019	29,975	36,739
2018	39,868	12,387
2017	12,074	17,699
Prior	37,441	25,693
Revolving	2,974	5,115
Revolving converted to term loans	72	72
Total loans and leases	133,489	124,681
Owner occupied commercial mortgage | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3,564	10,280
2020	9,322	19,052
2019	14,441	9,842
2018	9,287	20,928
2017	26,702	13,736
Prior	49,856	41,303
Revolving	7,996	8,438
Revolving converted to term loans	0	0
Total loans and leases	121,168	123,579
Non-owner occupied commercial mortgage | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	159,684	868,982
2020	822,341	629,426
2019	626,447	401,226
2018	355,431	342,372
2017	329,716	302,018
Prior	686,196	410,223
Revolving	38,083	33,442
Revolving converted to term loans	0	0
Total loans and leases	3,017,898	2,987,689
Non-owner occupied commercial mortgage | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	158,815	865,514
2020	809,647	609,975
2019	603,274	378,136
2018	332,010	331,800
2017	319,514	282,810
Prior	638,882	391,517
Revolving	35,835	32,149
Revolving converted to term loans	0	0
Total loans and leases	2,897,977	2,891,901
Non-owner occupied commercial mortgage | Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	794	569
2020	676	905
2019	880	10,794
2018	10,778	1,808
2017	1,440	5,121
Prior	2,918	3,279
Revolving	500	483
Revolving converted to term loans	0	0
Total loans and leases	17,986	22,959
Non-owner occupied commercial mortgage | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	75	2,899
2020	12,018	18,546
2019	22,293	12,296
2018	12,643	8,764
2017	8,762	14,087
Prior	44,396	15,427
Revolving	1,748	810
Revolving converted to term loans	0	0
Total loans and leases	101,935	72,829
Commercial and industrial | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	429,644	1,641,579
2020	1,449,721	1,005,012
2019	911,568	516,098
2018	456,036	320,118
2017	261,466	240,590
Prior	458,626	295,709
Revolving	972,630	987,846
Revolving converted to term loans	6,754	6,692
Total loans and leases	4,946,445	5,013,644
Commercial and industrial | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	424,035	1,620,622
2020	1,423,941	983,852
2019	884,987	504,463
2018	442,129	310,468
2017	251,356	234,735
Prior	445,265	286,996
Revolving	874,664	899,978
Revolving converted to term loans	5,150	5,520
Total loans and leases	4,751,527	4,846,634
Commercial and industrial | Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	102	3,146
2020	10,601	17,065
2019	22,183	7,265
2018	8,335	5,393
2017	6,160	3,307
Prior	7,764	4,912
Revolving	11,376	9,152
Revolving converted to term loans	194	189
Total loans and leases	66,715	50,429
Commercial and industrial | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	5,507	17,811
2020	15,179	4,095
2019	4,398	4,370
2018	5,572	4,257
2017	3,950	2,548
Prior	5,597	3,801
Revolving	24,608	22,384
Revolving converted to term loans	1,410	983
Total loans and leases	66,221	60,249
Commercial and industrial | Commercial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving	2
Revolving converted to term loans	0
Total loans and leases	2
Commercial and industrial | Commercial | Ungraded
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving	61,980	56,332
Revolving converted to term loans	0	0
Total loans and leases	61,980	56,332
Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	524,216	1,885,273
2020	1,813,714	987,802
2019	892,605	671,657
2018	572,764	605,545
2017	526,673	476,855
Prior	1,211,439	909,361
Revolving	24,615	25,193
Revolving converted to term loans	0	0
Total loans and leases	5,566,026	5,561,686
Revolving mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving	1,780,861	1,891,037
Revolving converted to term loans	157,561	161,817
Total loans and leases	1,938,422	2,052,854
Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	155,101	524,393
2020	486,080	343,683
2019	303,915	221,383
2018	192,579	105,530
2017	88,088	50,627
Prior	45,823	9,786
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	1,271,586	1,255,402
Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	20,882	54,319
2020	45,479	27,335
2019	22,852	11,009
2018	8,674	7,195
2017	6,247	2,994
Prior	34,873	29,366
Revolving	399,670	420,750
Revolving converted to term loans	0	0
Total loans and leases	538,677	552,968
SBA-PPP | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	936,012	2,406,291
2020	1,833,894	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	2,769,906	2,406,291
PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	33,642
2020	29,745	28,756
2019	27,229	33,051
2018	31,582	30,576
2017	27,170	31,330
Prior	283,429	268,884
Revolving	11,912	13,488
Revolving converted to term loans	21,706	23,155
Total loans and leases	432,773	462,882
Current | Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	40,360	215,112
2020	209,701	85,707
2019	52,406	24,860
2018	16,883	10,269
2017	8,037	6,093
Prior	5,241	2,218
Revolving	1,575	2,525
Revolving converted to term loans	0	0
Total loans and leases	334,203	346,784
Current | Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	521,849	1,882,683
2020	1,810,979	978,298
2019	889,902	655,798
2018	561,267	596,309
2017	518,205	461,719
Prior	1,166,958	878,634
Revolving	24,331	24,973
Revolving converted to term loans	0	0
Total loans and leases	5,493,491	5,478,414
Current | Revolving mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving	1,772,173	1,879,968
Revolving converted to term loans	149,893	150,868
Total loans and leases	1,922,066	2,030,836
Current | Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	155,101	521,719
2020	484,026	340,594
2019	302,622	219,597
2018	191,055	104,280
2017	87,139	49,872
Prior	45,337	9,604
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	1,265,280	1,245,666
Current | Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	20,879	53,842
2020	45,239	27,117
2019	22,631	10,911
2018	8,552	7,159
2017	6,246	2,980
Prior	34,873	29,336
Revolving	395,282	415,044
Revolving converted to term loans	0	0
Total loans and leases	533,702	546,389
Current | PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	31,475
2020	28,056	25,425
2019	24,347	27,183
2018	26,763	27,955
2017	24,879	28,995
Prior	247,606	232,186
Revolving	11,788	13,212
Revolving converted to term loans	20,068	21,027
Total loans and leases	383,507	407,458
30 to 59 Days past due | Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	108	420
2019	15	121
2018	61	370
2017	30	0
Prior	52	21
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	266	932
30 to 59 Days past due | Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,367	2,278
2020	2,193	4,573
2019	236	11,463
2018	9,619	3,772
2017	4,113	8,613
Prior	15,567	12,299
Revolving	255	220
Revolving converted to term loans	0	0
Total loans and leases	34,350	43,218
30 to 59 Days past due | Revolving mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving	3,877	8,241
Revolving converted to term loans	2,345	3,736
Total loans and leases	6,222	11,977
30 to 59 Days past due | Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	2,175
2020	1,327	1,873
2019	962	1,257
2018	1,054	842
2017	703	544
Prior	386	134
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	4,432	6,825
30 to 59 Days past due | Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3	322
2020	131	114
2019	100	77
2018	106	18
2017	1	11
Prior	0	7
Revolving	1,905	3,061
Revolving converted to term loans	0	0
Total loans and leases	2,246	3,610
30 to 59 Days past due | PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	999
2020	344	925
2019	390	801
2018	407	718
2017	300	1,341
Prior	9,423	12,637
Revolving	19	156
Revolving converted to term loans	367	745
Total loans and leases	11,250	18,322
60 to 89 Days past due | Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	240	0
2019	138	0
2018	59	9
2017	366	0
Prior	141	68
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	944	77
60 to 89 Days past due | Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	30
2020	256	100
2019	1,012	1,246
2018	1,040	1,449
2017	558	834
Prior	4,530	4,705
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	7,396	8,364
60 to 89 Days past due | Revolving mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving	699	527
Revolving converted to term loans	904	2,099
Total loans and leases	1,603	2,626
60 to 89 Days past due | Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	329
2020	433	689
2019	197	312
2018	253	351
2017	117	109
Prior	14	45
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	1,014	1,835
60 to 89 Days past due | Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	102
2020	95	20
2019	7	13
2018	10	18
2017	0	3
Prior	0	23
Revolving	1,101	1,285
Revolving converted to term loans	0	0
Total loans and leases	1,213	1,464
60 to 89 Days past due | PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	447
2020	51	81
2019	88	312
2018	0	695
2017	165	97
Prior	3,896	4,098
Revolving	0	9
Revolving converted to term loans	122	337
Total loans and leases	4,322	6,076
90 Days or greater | Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	543	0
2019	0	0
2018	0	0
2017	59	0
Prior	50	330
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	652	330
90 Days or greater | Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	282
2020	286	4,831
2019	1,455	3,150
2018	838	4,015
2017	3,797	5,689
Prior	24,384	13,723
Revolving	29	0
Revolving converted to term loans	0	0
Total loans and leases	30,789	31,690
90 Days or greater | Revolving mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving	4,112	2,301
Revolving converted to term loans	4,419	5,114
Total loans and leases	8,531	7,415
90 Days or greater | Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	170
2020	294	527
2019	134	217
2018	217	57
2017	129	102
Prior	86	3
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	860	1,076
90 Days or greater | Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	53
2020	14	84
2019	114	8
2018	6	0
2017	0	0
Prior	0	0
Revolving	1,382	1,360
Revolving converted to term loans	0	0
Total loans and leases	1,516	1,505
90 Days or greater | PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	721
2020	1,294	2,325
2019	2,404	4,755
2018	4,412	1,208
2017	1,826	897
Prior	22,504	19,963
Revolving	105	111
Revolving converted to term loans	1,149	1,046
Total loans and leases	$ 33,694	$ 31,026