Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	$ 18,799,311	$ 18,444,094
Total Commercial [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	18,127,211	17,684,578
Total Commercial [Member] | Pass-Watch [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	396,983	457,620
Total Commercial [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	61,600	90,253
Total Commercial [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	213,517	211,643
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	389,781	632,397
Term Loans, Amortized Cost Basis by Origination Year, 2022	794,083	696,538
Term Loans, Amortized Cost Basis by Origination Year, 2021	919,749	519,421
Term Loans, Amortized Cost Basis by Origination Year, 2020	497,169	193,627
Term Loans, Amortized Cost Basis by Origination Year, 2019	180,184	109,755
Term Loans, Amortized Cost Basis by Origination Year, Prior	936,550	937,720
Revolving Loans	3,590	3,147
Notes Receivable Gross	3,721,106	3,092,605
Residential Mortgages [Member] | Performing [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	389,320	631,339
Term Loans, Amortized Cost Basis by Origination Year, 2022	791,881	694,104
Term Loans, Amortized Cost Basis by Origination Year, 2021	917,332	518,705
Term Loans, Amortized Cost Basis by Origination Year, 2020	496,414	192,431
Term Loans, Amortized Cost Basis by Origination Year, 2019	178,861	107,675
Term Loans, Amortized Cost Basis by Origination Year, Prior	916,803	918,918
Revolving Loans	3,590	3,147
Notes Receivable Gross	3,694,201	3,066,319
Residential Mortgages [Member] | Nonperforming [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	461	1,058
Term Loans, Amortized Cost Basis by Origination Year, 2022	2,202	2,434
Term Loans, Amortized Cost Basis by Origination Year, 2021	2,417	716
Term Loans, Amortized Cost Basis by Origination Year, 2020	755	1,196
Term Loans, Amortized Cost Basis by Origination Year, 2019	1,323	2,080
Term Loans, Amortized Cost Basis by Origination Year, Prior	19,747	18,802
Notes Receivable Gross	26,905	26,286
Residential Mortgages [Member] | Gross Charge-offs [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, Prior	53
Notes Receivable Gross	53
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	64,162	103,935
Term Loans, Amortized Cost Basis by Origination Year, 2022	66,716	58,446
Term Loans, Amortized Cost Basis by Origination Year, 2021	42,024	45,869
Term Loans, Amortized Cost Basis by Origination Year, 2020	32,277	63,473
Term Loans, Amortized Cost Basis by Origination Year, 2019	38,285	41,940
Term Loans, Amortized Cost Basis by Origination Year, Prior	50,394	43,830
Revolving Loans	1,148,813	1,213,417
Revolving Loans Converted to Term Loans	20,591	6,437
Notes Receivable Gross	1,463,262	1,577,347
Consumer [Member] | Performing [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	63,967	103,742
Term Loans, Amortized Cost Basis by Origination Year, 2022	66,584	58,248
Term Loans, Amortized Cost Basis by Origination Year, 2021	41,713	45,641
Term Loans, Amortized Cost Basis by Origination Year, 2020	31,708	62,715
Term Loans, Amortized Cost Basis by Origination Year, 2019	37,837	41,559
Term Loans, Amortized Cost Basis by Origination Year, Prior	47,188	40,489
Revolving Loans	1,148,476	1,212,958
Revolving Loans Converted to Term Loans	17,989	4,834
Notes Receivable Gross	1,455,462	1,570,186
Consumer [Member] | Nonperforming [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	195	193
Term Loans, Amortized Cost Basis by Origination Year, 2022	132	198
Term Loans, Amortized Cost Basis by Origination Year, 2021	311	228
Term Loans, Amortized Cost Basis by Origination Year, 2020	569	758
Term Loans, Amortized Cost Basis by Origination Year, 2019	448	381
Term Loans, Amortized Cost Basis by Origination Year, Prior	3,206	3,341
Revolving Loans	337	459
Revolving Loans Converted to Term Loans	2,602	1,603
Notes Receivable Gross	7,800	7,161
Consumer [Member] | Gross Charge-offs [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	289
Term Loans, Amortized Cost Basis by Origination Year, 2022	1,641
Term Loans, Amortized Cost Basis by Origination Year, 2021	967
Term Loans, Amortized Cost Basis by Origination Year, 2020	144
Term Loans, Amortized Cost Basis by Origination Year, 2019	415
Term Loans, Amortized Cost Basis by Origination Year, Prior	568
Revolving Loans	5,543
Revolving Loans Converted to Term Loans	1,220
Notes Receivable Gross	10,787
Residential Mortgage and Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	5,184,368	4,669,952
Residential Mortgage and Consumer [Member] | Performing [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	5,149,663	4,636,505
Residential Mortgage and Consumer [Member] | Nonperforming [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	34,705	33,447
Commercial Non-Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	1,374,746	2,728,906
Term Loans, Amortized Cost Basis by Origination Year, 2022	2,033,975	1,517,070
Term Loans, Amortized Cost Basis by Origination Year, 2021	1,241,038	725,405
Term Loans, Amortized Cost Basis by Origination Year, 2020	563,896	607,672
Term Loans, Amortized Cost Basis by Origination Year, 2019	449,410	288,376
Term Loans, Amortized Cost Basis by Origination Year, Prior	988,342	815,603
Revolving Loans	3,319,068	3,324,505
Revolving Loans Converted to Term Loans	105,110	138,916
Notes Receivable Gross	10,075,585	10,146,453
Commercial Non-Real Estate [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	1,316,709	2,600,656
Term Loans, Amortized Cost Basis by Origination Year, 2022	1,938,055	1,450,689
Term Loans, Amortized Cost Basis by Origination Year, 2021	1,205,406	679,355
Term Loans, Amortized Cost Basis by Origination Year, 2020	545,552	569,842
Term Loans, Amortized Cost Basis by Origination Year, 2019	435,870	267,025
Term Loans, Amortized Cost Basis by Origination Year, Prior	966,469	763,122
Revolving Loans	3,184,264	3,193,769
Revolving Loans Converted to Term Loans	88,645	116,659
Notes Receivable Gross	9,680,970	9,641,117
Commercial Non-Real Estate [Member] | Pass-Watch [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	19,835	68,307
Term Loans, Amortized Cost Basis by Origination Year, 2022	47,472	38,949
Term Loans, Amortized Cost Basis by Origination Year, 2021	13,054	31,841
Term Loans, Amortized Cost Basis by Origination Year, 2020	3,820	11,757
Term Loans, Amortized Cost Basis by Origination Year, 2019	9,284	8,237
Term Loans, Amortized Cost Basis by Origination Year, Prior	9,771	49,577
Revolving Loans	76,764	66,339
Revolving Loans Converted to Term Loans	3,257	9,836
Notes Receivable Gross	183,257	284,843
Commercial Non-Real Estate [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	649	30,276
Term Loans, Amortized Cost Basis by Origination Year, 2022	9,324	13,625
Term Loans, Amortized Cost Basis by Origination Year, 2021	14,251	2,443
Term Loans, Amortized Cost Basis by Origination Year, 2020	5,553	4,406
Term Loans, Amortized Cost Basis by Origination Year, 2019		322
Term Loans, Amortized Cost Basis by Origination Year, Prior	866	1,654
Revolving Loans	12,342	25,184
Revolving Loans Converted to Term Loans	7,143	2,070
Notes Receivable Gross	50,128	79,980
Commercial Non-Real Estate [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	37,553	29,667
Term Loans, Amortized Cost Basis by Origination Year, 2022	39,124	13,807
Term Loans, Amortized Cost Basis by Origination Year, 2021	8,327	11,766
Term Loans, Amortized Cost Basis by Origination Year, 2020	8,971	21,667
Term Loans, Amortized Cost Basis by Origination Year, 2019	4,256	12,792
Term Loans, Amortized Cost Basis by Origination Year, Prior	11,236	1,250
Revolving Loans	45,698	39,213
Revolving Loans Converted to Term Loans	6,065	10,351
Notes Receivable Gross	161,230	140,513
Commercial Non-Real Estate [Member] | Gross Charge-offs [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	7,019
Term Loans, Amortized Cost Basis by Origination Year, 2022	872
Term Loans, Amortized Cost Basis by Origination Year, 2021	468
Term Loans, Amortized Cost Basis by Origination Year, 2020	21,109
Term Loans, Amortized Cost Basis by Origination Year, 2019	81
Term Loans, Amortized Cost Basis by Origination Year, Prior	250
Revolving Loans	12,299
Revolving Loans Converted to Term Loans	2,739
Notes Receivable Gross	44,837
Commercial Real Estate - Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	319,245	657,149
Term Loans, Amortized Cost Basis by Origination Year, 2022	693,086	656,588
Term Loans, Amortized Cost Basis by Origination Year, 2021	615,193	548,851
Term Loans, Amortized Cost Basis by Origination Year, 2020	518,152	350,150
Term Loans, Amortized Cost Basis by Origination Year, 2019	316,365	285,083
Term Loans, Amortized Cost Basis by Origination Year, Prior	571,669	480,548
Revolving Loans	34,157	48,623
Revolving Loans Converted to Term Loans	13,460	6,066
Notes Receivable Gross	3,081,327	3,033,058
Commercial Real Estate - Owner Occupied [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	299,428	630,121
Term Loans, Amortized Cost Basis by Origination Year, 2022	681,918	650,742
Term Loans, Amortized Cost Basis by Origination Year, 2021	605,725	537,849
Term Loans, Amortized Cost Basis by Origination Year, 2020	509,454	328,364
Term Loans, Amortized Cost Basis by Origination Year, 2019	302,742	265,437
Term Loans, Amortized Cost Basis by Origination Year, Prior	538,751	447,707
Revolving Loans	31,599	46,730
Revolving Loans Converted to Term Loans	13,460	5,107
Notes Receivable Gross	2,983,077	2,912,057
Commercial Real Estate - Owner Occupied [Member] | Pass-Watch [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	18,697	7,129
Term Loans, Amortized Cost Basis by Origination Year, 2022	3,547	5,299
Term Loans, Amortized Cost Basis by Origination Year, 2021	6,788	3,743
Term Loans, Amortized Cost Basis by Origination Year, 2020	2,803	13,301
Term Loans, Amortized Cost Basis by Origination Year, 2019	9,007	10,872
Term Loans, Amortized Cost Basis by Origination Year, Prior	21,563	7,706
Revolving Loans	856	893
Revolving Loans Converted to Term Loans		150
Notes Receivable Gross	63,261	49,093
Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	563
Term Loans, Amortized Cost Basis by Origination Year, 2021	2,047	544
Term Loans, Amortized Cost Basis by Origination Year, 2020	656	822
Term Loans, Amortized Cost Basis by Origination Year, 2019		1,231
Term Loans, Amortized Cost Basis by Origination Year, Prior	4,748	3,670
Revolving Loans	498
Notes Receivable Gross	8,512	6,267
Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	557	19,899
Term Loans, Amortized Cost Basis by Origination Year, 2022	7,621	547
Term Loans, Amortized Cost Basis by Origination Year, 2021	633	6,715
Term Loans, Amortized Cost Basis by Origination Year, 2020	5,239	7,663
Term Loans, Amortized Cost Basis by Origination Year, 2019	4,616	7,543
Term Loans, Amortized Cost Basis by Origination Year, Prior	6,607	21,465
Revolving Loans	1,204	1,000
Revolving Loans Converted to Term Loans		809
Notes Receivable Gross	26,477	65,641
Commercial Real Estate - Income Producing [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	383,101	896,199
Term Loans, Amortized Cost Basis by Origination Year, 2022	963,796	813,448
Term Loans, Amortized Cost Basis by Origination Year, 2021	1,032,353	721,984
Term Loans, Amortized Cost Basis by Origination Year, 2020	743,250	443,633
Term Loans, Amortized Cost Basis by Origination Year, 2019	373,929	245,617
Term Loans, Amortized Cost Basis by Origination Year, Prior	415,240	319,156
Revolving Loans	65,899	113,954
Revolving Loans Converted to Term Loans	49,985	7,000
Notes Receivable Gross	4,027,553	3,560,991
Commercial Real Estate - Income Producing [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	359,078	894,522
Term Loans, Amortized Cost Basis by Origination Year, 2022	926,189	795,378
Term Loans, Amortized Cost Basis by Origination Year, 2021	1,031,726	660,235
Term Loans, Amortized Cost Basis by Origination Year, 2020	683,720	420,435
Term Loans, Amortized Cost Basis by Origination Year, 2019	349,978	232,145
Term Loans, Amortized Cost Basis by Origination Year, Prior	396,668	317,446
Revolving Loans	65,636	113,487
Revolving Loans Converted to Term Loans	49,685	7,000
Notes Receivable Gross	3,862,680	3,440,648
Commercial Real Estate - Income Producing [Member] | Pass-Watch [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	3,084	1,027
Term Loans, Amortized Cost Basis by Origination Year, 2022	35,676	18,070
Term Loans, Amortized Cost Basis by Origination Year, 2021	338	58,256
Term Loans, Amortized Cost Basis by Origination Year, 2020	57,931	20,865
Term Loans, Amortized Cost Basis by Origination Year, 2019	23,951	12,066
Term Loans, Amortized Cost Basis by Origination Year, Prior	16,034	836
Revolving Loans	263	467
Revolving Loans Converted to Term Loans	300
Notes Receivable Gross	137,577	111,587
Commercial Real Estate - Income Producing [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	159	235
Term Loans, Amortized Cost Basis by Origination Year, 2021		708
Term Loans, Amortized Cost Basis by Origination Year, 2020	354	2,325
Term Loans, Amortized Cost Basis by Origination Year, 2019		166
Term Loans, Amortized Cost Basis by Origination Year, Prior	1,745	376
Notes Receivable Gross	2,258	3,810
Commercial Real Estate - Income Producing [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	20,780	415
Term Loans, Amortized Cost Basis by Origination Year, 2022	1,931
Term Loans, Amortized Cost Basis by Origination Year, 2021	289	2,785
Term Loans, Amortized Cost Basis by Origination Year, 2020	1,245	8
Term Loans, Amortized Cost Basis by Origination Year, 2019		1,240
Term Loans, Amortized Cost Basis by Origination Year, Prior	793	498
Notes Receivable Gross	25,038	4,946
Commercial Real Estate - Income Producing [Member] | Gross Charge-offs [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	73
Notes Receivable Gross	73
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	4,027,553	3,560,991
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	3,862,680	3,440,648
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	137,577	111,587
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	2,258	3,810
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	25,038	4,946
Construction and Land Development [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	319,650	672,003
Term Loans, Amortized Cost Basis by Origination Year, 2022	746,723	713,730
Term Loans, Amortized Cost Basis by Origination Year, 2021	335,501	149,222
Term Loans, Amortized Cost Basis by Origination Year, 2020	60,031	9,965
Term Loans, Amortized Cost Basis by Origination Year, 2019	6,533	15,620
Term Loans, Amortized Cost Basis by Origination Year, Prior	20,751	11,684
Revolving Loans	120,214	128,911
Revolving Loans Converted to Term Loans	5,443	2,457
Notes Receivable Gross	1,614,846	1,703,592
Construction and Land Development [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	310,519	663,735
Term Loans, Amortized Cost Basis by Origination Year, 2022	744,624	711,731
Term Loans, Amortized Cost Basis by Origination Year, 2021	334,025	148,579
Term Loans, Amortized Cost Basis by Origination Year, 2020	59,938	9,198
Term Loans, Amortized Cost Basis by Origination Year, 2019	5,875	15,360
Term Loans, Amortized Cost Basis by Origination Year, Prior	20,227	10,854
Revolving Loans	119,833	128,842
Revolving Loans Converted to Term Loans	5,443	2,457
Notes Receivable Gross	1,600,484	1,690,756
Construction and Land Development [Member] | Pass-Watch [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	8,429	8,233
Term Loans, Amortized Cost Basis by Origination Year, 2022	2,011	1,944
Term Loans, Amortized Cost Basis by Origination Year, 2021	1,409	643
Term Loans, Amortized Cost Basis by Origination Year, 2020	93	559
Term Loans, Amortized Cost Basis by Origination Year, 2019	648	199
Term Loans, Amortized Cost Basis by Origination Year, Prior	212	450
Revolving Loans	86	69
Notes Receivable Gross	12,888	12,097
Construction and Land Development [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023	702
Term Loans, Amortized Cost Basis by Origination Year, 2020		196
Notes Receivable Gross	702	196
Construction and Land Development [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2023		35
Term Loans, Amortized Cost Basis by Origination Year, 2022	88	55
Term Loans, Amortized Cost Basis by Origination Year, 2021	67
Term Loans, Amortized Cost Basis by Origination Year, 2020		12
Term Loans, Amortized Cost Basis by Origination Year, 2019	10	61
Term Loans, Amortized Cost Basis by Origination Year, Prior	312	380
Revolving Loans	295
Notes Receivable Gross	772	543
Construction and Land Development [Member] | Gross Charge-offs [Member]
Accounts Notes And Loans Receivable [Line Items]
Term Loans, Amortized Cost Basis by Origination Year, 2022	7
Term Loans, Amortized Cost Basis by Origination Year, 2021	54
Term Loans, Amortized Cost Basis by Origination Year, Prior	11
Notes Receivable Gross	72
Construction and Land Development [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	1,614,846	1,703,592
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	1,600,484	1,690,756
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	12,888	12,097
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	702	196
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes Receivable Gross	$ 772	$ 543