Loans and Leases Loans and Leases (Credit Rating) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	$ 32,516,189	$ 32,791,975
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	5,156,155	8,459,531
2020	5,598,851	4,217,219
2019	3,648,981	2,787,346
2018	2,106,491	2,053,335
2017	1,611,878	1,647,878
Prior	2,750,737	2,238,335
Revolving	1,349,439	1,147,519
Revolving converted to term loans	6,813	6,897
Total loans and leases	22,229,345	22,558,060
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,381,464	2,679,097
2020	2,252,057	1,444,947
2019	970,938	929,030
2018	572,626	728,918
2017	467,456	536,569
Prior	983,871	951,150
Revolving	2,156,652	2,339,505
Revolving converted to term loans	128,525	161,817
Total loans and leases	9,913,589	9,771,033
Consumer And PCD Portfolio Segments
Financing Receivable, Credit Quality Indicator [Line Items]
2021	7,537,619	11,172,270
2020	7,875,749	5,690,922
2019	4,644,151	3,749,427
2018	2,704,682	2,812,829
2017	2,102,661	2,215,777
Prior	3,981,084	3,458,369
Revolving	3,516,871	3,500,512
Revolving converted to term loans	153,372	191,869
Total loans and leases	32,516,189	32,791,975
Construction and land development | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	373,331	342,658
2020	452,121	341,862
2019	256,647	198,300
2018	100,468	56,118
2017	48,476	23,977
Prior	12,406	11,387
Revolving	4,231	11,122
Revolving converted to term loans	0	0
Total loans and leases	1,247,680	985,424
Construction and land development | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	373,012	342,183
2020	451,926	341,233
2019	256,321	190,429
2018	98,892	50,776
2017	44,343	23,969
Prior	12,396	11,306
Revolving	4,231	10,969
Revolving converted to term loans	0	0
Total loans and leases	1,241,121	970,865
Construction and land development | Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	19	246
2020	157	0
2019	0	6,421
2018	134	5,342
2017	63	0
Prior	0	0
Revolving	0	153
Revolving converted to term loans	0	0
Total loans and leases	373	12,162
Construction and land development | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	300	229
2020	38	629
2019	326	1,450
2018	1,442	0
2017	4,070	8
Prior	10	81
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	6,186	2,397
Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	166,026	215,112
2020	177,102	86,127
2019	26,889	24,981
2018	10,258	10,648
2017	5,814	6,093
Prior	3,085	2,637
Revolving	2,594	2,525
Revolving converted to term loans	0	0
Total loans and leases	391,768	348,123
Owner occupied commercial mortgage | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,080,750	3,200,021
2020	3,109,944	2,240,919
2019	2,040,892	1,671,722
2018	1,355,124	1,334,727
2017	1,067,390	1,081,293
Prior	1,838,498	1,521,016
Revolving	132,765	115,109
Revolving converted to term loans	191	205
Total loans and leases	11,625,554	11,165,012
Owner occupied commercial mortgage | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,069,209	3,183,467
2020	3,078,093	2,201,165
2019	1,989,052	1,625,141
2018	1,316,012	1,301,412
2017	1,036,593	1,049,858
Prior	1,778,334	1,454,020
Revolving	122,411	101,556
Revolving converted to term loans	120	133
Total loans and leases	11,389,824	10,916,752
Owner occupied commercial mortgage | Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,082	6,274
2020	24,356	20,702
2019	29,358	36,739
2018	28,165	12,387
2017	12,199	17,699
Prior	20,469	25,693
Revolving	4,047	5,115
Revolving converted to term loans	71	72
Total loans and leases	120,747	124,681
Owner occupied commercial mortgage | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	9,459	10,280
2020	7,495	19,052
2019	22,482	9,842
2018	10,947	20,928
2017	18,598	13,736
Prior	39,695	41,303
Revolving	6,307	8,438
Revolving converted to term loans	0	0
Total loans and leases	114,983	123,579
Non-owner occupied commercial mortgage | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	442,059	868,982
2020	782,736	629,426
2019	610,198	401,226
2018	298,910	342,372
2017	294,910	302,018
Prior	540,417	410,223
Revolving	33,698	33,442
Revolving converted to term loans	0	0
Total loans and leases	3,002,928	2,987,689
Non-owner occupied commercial mortgage | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	438,949	865,514
2020	770,507	609,975
2019	587,335	378,136
2018	278,507	331,800
2017	283,867	282,810
Prior	507,411	391,517
Revolving	31,876	32,149
Revolving converted to term loans	0	0
Total loans and leases	2,898,452	2,891,901
Non-owner occupied commercial mortgage | Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	495	569
2020	487	905
2019	263	10,794
2018	10,219	1,808
2017	800	5,121
Prior	5,654	3,279
Revolving	500	483
Revolving converted to term loans	0	0
Total loans and leases	18,418	22,959
Non-owner occupied commercial mortgage | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,615	2,899
2020	11,742	18,546
2019	22,600	12,296
2018	10,184	8,764
2017	10,243	14,087
Prior	27,352	15,427
Revolving	1,322	810
Revolving converted to term loans	0	0
Total loans and leases	86,058	72,829
Commercial and industrial | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,248,645	1,641,579
2020	1,178,503	1,005,012
2019	741,244	516,098
2018	351,989	320,118
2017	201,102	240,590
Prior	359,416	295,709
Revolving	1,178,745	987,846
Revolving converted to term loans	6,622	6,692
Total loans and leases	5,266,266	5,013,644
Commercial and industrial | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,238,557	1,620,622
2020	1,162,246	983,852
2019	714,374	504,463
2018	344,220	310,468
2017	193,857	234,735
Prior	350,870	286,996
Revolving	1,087,462	899,978
Revolving converted to term loans	5,136	5,520
Total loans and leases	5,096,722	4,846,634
Commercial and industrial | Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,323	3,146
2020	8,279	17,065
2019	22,100	7,265
2018	3,528	5,393
2017	4,070	3,307
Prior	4,324	4,912
Revolving	4,575	9,152
Revolving converted to term loans	206	189
Total loans and leases	49,405	50,429
Commercial and industrial | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	7,765	17,811
2020	7,978	4,095
2019	4,770	4,370
2018	4,241	4,257
2017	3,175	2,548
Prior	4,221	3,801
Revolving	17,392	22,384
Revolving converted to term loans	1,280	983
Total loans and leases	50,822	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	1
Revolving	1
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	69,315	56,332
Revolving converted to term loans	0	0
Total loans and leases	69,315	56,332
Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,592,476	1,885,273
2020	1,654,367	987,802
2019	696,566	671,657
2018	415,787	605,545
2017	396,391	476,855
Prior	925,580	909,361
Revolving	20,179	25,193
Revolving converted to term loans	0	0
Total loans and leases	5,701,346	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	1,706,165	1,891,037
Revolving converted to term loans	128,525	161,817
Total loans and leases	1,834,690	2,052,854
Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	505,766	524,393
2020	386,788	343,683
2019	231,137	221,383
2018	141,124	105,530
2017	60,240	50,627
Prior	25,322	9,786
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	1,350,377	1,255,402
Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	117,196	54,319
2020	33,800	27,335
2019	16,346	11,009
2018	5,457	7,195
2017	5,011	2,994
Prior	29,884	29,366
Revolving	427,714	420,750
Revolving converted to term loans	0	0
Total loans and leases	635,408	552,968
SBA-PPP
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases	1,100,000
SBA-PPP | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,011,370	2,406,291
2020	75,547	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	1,086,917	2,406,291
PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	33,642
2020	24,841	28,756
2019	24,232	33,051
2018	25,565	30,576
2017	23,327	31,330
Prior	246,476	268,884
Revolving	10,780	13,488
Revolving converted to term loans	18,034	23,155
Total loans and leases	373,255	462,882
Current | Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	165,993	215,112
2020	175,007	85,707
2019	26,889	24,860
2018	10,258	10,269
2017	5,745	6,093
Prior	3,016	2,218
Revolving	2,594	2,525
Revolving converted to term loans	0	0
Total loans and leases	389,502	346,784
Current | Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,591,381	1,882,683
2020	1,651,853	978,298
2019	690,779	655,798
2018	410,446	596,309
2017	390,940	461,719
Prior	900,129	878,634
Revolving	19,930	24,973
Revolving converted to term loans	0	0
Total loans and leases	5,655,458	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	1,700,947	1,879,968
Revolving converted to term loans	122,200	150,868
Total loans and leases	1,823,147	2,030,836
Current | Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	504,537	521,719
2020	384,849	340,594
2019	229,033	219,597
2018	139,764	104,280
2017	59,487	49,872
Prior	24,926	9,604
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	1,342,596	1,245,666
Current | Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	117,047	53,842
2020	33,700	27,117
2019	16,222	10,911
2018	5,431	7,159
2017	5,011	2,980
Prior	29,871	29,336
Revolving	423,512	415,044
Revolving converted to term loans	0	0
Total loans and leases	630,794	546,389
Current | PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	31,475
2020	23,091	25,425
2019	23,792	27,183
2018	21,034	27,955
2017	20,864	28,995
Prior	213,681	232,186
Revolving	10,622	13,212
Revolving converted to term loans	16,453	21,027
Total loans and leases	329,537	407,458
30 to 59 Days past due | Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	33	0
2020	416	420
2019	0	121
2018	0	370
2017	0	0
Prior	28	21
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	477	932
30 to 59 Days past due | Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	252	2,278
2020	1,506	4,573
2019	4,728	11,463
2018	3,066	3,772
2017	1,486	8,613
Prior	7,379	12,299
Revolving	0	220
Revolving converted to term loans	0	0
Total loans and leases	18,417	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	2,939	8,241
Revolving converted to term loans	2,648	3,736
Total loans and leases	5,587	11,977
30 to 59 Days past due | Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	889	2,175
2020	1,262	1,873
2019	1,450	1,257
2018	877	842
2017	586	544
Prior	281	134
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	5,345	6,825
30 to 59 Days past due | Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	89	322
2020	63	114
2019	18	77
2018	24	18
2017	0	11
Prior	13	7
Revolving	1,990	3,061
Revolving converted to term loans	0	0
Total loans and leases	2,197	3,610
30 to 59 Days past due | PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	999
2020	846	925
2019	61	801
2018	785	718
2017	1,393	1,341
Prior	7,777	12,637
Revolving	113	156
Revolving converted to term loans	432	745
Total loans and leases	11,407	18,322
60 to 89 Days past due | Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	1,650	0
2019	0	0
2018	0	9
2017	69	0
Prior	0	68
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	1,719	77
60 to 89 Days past due | Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	788	30
2020	295	100
2019	0	1,246
2018	764	1,449
2017	881	834
Prior	3,879	4,705
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	6,607	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	378	527
Revolving converted to term loans	1,065	2,099
Total loans and leases	1,443	2,626
60 to 89 Days past due | Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	200	329
2020	330	689
2019	234	312
2018	255	351
2017	84	109
Prior	70	45
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	1,173	1,835
60 to 89 Days past due | Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	11	102
2020	25	20
2019	89	13
2018	1	18
2017	0	3
Prior	0	23
Revolving	996	1,285
Revolving converted to term loans	0	0
Total loans and leases	1,122	1,464
60 to 89 Days past due | PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	447
2020	98	81
2019	149	312
2018	48	695
2017	0	97
Prior	4,699	4,098
Revolving	29	9
Revolving converted to term loans	177	337
Total loans and leases	5,200	6,076
90 Days or greater | Construction and land development | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	29	0
2019	0	0
2018	0	0
2017	0	0
Prior	41	330
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	70	330
90 Days or greater | Residential mortgage | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	55	282
2020	713	4,831
2019	1,059	3,150
2018	1,511	4,015
2017	3,084	5,689
Prior	14,193	13,723
Revolving	249	0
Revolving converted to term loans	0	0
Total loans and leases	20,864	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	1,901	2,301
Revolving converted to term loans	2,612	5,114
Total loans and leases	4,513	7,415
90 Days or greater | Consumer auto | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	140	170
2020	347	527
2019	420	217
2018	228	57
2017	83	102
Prior	45	3
Revolving	0	0
Revolving converted to term loans	0	0
Total loans and leases	1,263	1,076
90 Days or greater | Consumer other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	49	53
2020	12	84
2019	17	8
2018	1	0
2017	0	0
Prior	0	0
Revolving	1,216	1,360
Revolving converted to term loans	0	0
Total loans and leases	1,295	1,505
90 Days or greater | PCD Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	721
2020	806	2,325
2019	230	4,755
2018	3,698	1,208
2017	1,070	897
Prior	20,319	19,963
Revolving	16	111
Revolving converted to term loans	972	1,046
Total loans and leases	$ 27,111	$ 31,026