Loans and Allowance for Credit Losses for Loans - Internal Loan Classification Risk by Loan Portfolio Class by Origination Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 50,210,295	$ 46,917,200
Gross loan charge-offs
Total	75,453	41,896
Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,579,982	1,633,478
Year two, fiscal year before current fiscal year	1,123,368	1,115,331
Year three, two years before current fiscal year	784,426	614,019
Year four, three years before current fiscal year	379,097	331,400
Year five, four years before current fiscal year	217,248	258,656
More than five years before current fiscal year	588,062	458,680
Revolving Loans Amortized Cost Basis	4,524,198	4,393,115
Revolving Loans Converted to Term Loans	34,162	151
Loans	9,230,543	8,804,830
Gross loan charge-offs
Total	48,015	33,250
Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,494,417	1,600,747
Year two, fiscal year before current fiscal year	1,047,513	1,089,386
Year three, two years before current fiscal year	765,335	590,406
Year four, three years before current fiscal year	377,047	322,564
Year five, four years before current fiscal year	211,504	250,031
More than five years before current fiscal year	523,430	386,085
Revolving Loans Amortized Cost Basis	4,382,361	4,307,163
Revolving Loans Converted to Term Loans	29,798	144
Loans	8,831,405	8,546,526
Commercial and Industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	70,807	31,557
Year two, fiscal year before current fiscal year	73,423	3,367
Year three, two years before current fiscal year	15,296	19,492
Year four, three years before current fiscal year	358	4,732
Year five, four years before current fiscal year	1,870	4,369
More than five years before current fiscal year	915	3,558
Revolving Loans Amortized Cost Basis	99,981	51,021
Revolving Loans Converted to Term Loans	139	7
Loans	262,789	118,103
Commercial and Industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	3,100	288
Year two, fiscal year before current fiscal year	1,837	1,734
Year three, two years before current fiscal year	2,629	4,121
Year four, three years before current fiscal year	1,714	1,412
Year five, four years before current fiscal year	1,221	4,256
More than five years before current fiscal year	5,900	4,879
Revolving Loans Amortized Cost Basis	29,569	31,698
Revolving Loans Converted to Term Loans	4,225	0
Loans	50,195	48,388
Commercial and Industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	11,658	886
Year two, fiscal year before current fiscal year	595	20,844
Year three, two years before current fiscal year	1,166	0
Year four, three years before current fiscal year		2,692
Year four, three years before current fiscal year	(22)
Year five, four years before current fiscal year	2,653	0
More than five years before current fiscal year	57,817	64,158
Revolving Loans Amortized Cost Basis	12,287	3,233
Revolving Loans Converted to Term Loans	0	0
Loans	86,154	91,813
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	31,970,047	29,432,868
Gross loan charge-offs
Total	22,946	4,561
Commercial real estate | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	4,272,246	6,923,489
Year two, fiscal year before current fiscal year	6,738,948	5,250,609
Year three, two years before current fiscal year	5,052,212	3,339,684
Year four, three years before current fiscal year	3,022,501	2,752,292
Year five, four years before current fiscal year	2,469,773	1,657,775
More than five years before current fiscal year	5,957,963	5,336,045
Revolving Loans Amortized Cost Basis	622,497	468,635
Revolving Loans Converted to Term Loans	107,099	3,504
Loans	28,243,239	25,732,033
Commercial real estate | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	4,088,835	6,815,115
Year two, fiscal year before current fiscal year	6,630,322	5,168,127
Year three, two years before current fiscal year	4,791,190	3,246,885
Year four, three years before current fiscal year	2,789,275	2,672,223
Year five, four years before current fiscal year	2,329,385	1,536,327
More than five years before current fiscal year	5,385,809	5,027,128
Revolving Loans Amortized Cost Basis	618,056	452,461
Revolving Loans Converted to Term Loans	104,839	3,504
Loans	26,737,711	24,921,770
Commercial real estate | Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	125,296	93,286
Year two, fiscal year before current fiscal year	82,917	48,007
Year three, two years before current fiscal year	248,900	60,169
Year four, three years before current fiscal year	184,720	45,447
Year five, four years before current fiscal year	69,949	62,111
More than five years before current fiscal year	358,059	125,414
Revolving Loans Amortized Cost Basis	26	8,188
Revolving Loans Converted to Term Loans	183	0
Loans	1,070,050	442,622
Commercial real estate | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	58,115	15,088
Year two, fiscal year before current fiscal year	25,709	34,475
Year three, two years before current fiscal year	12,122	32,630
Year four, three years before current fiscal year	48,506	34,622
Year five, four years before current fiscal year	70,439	59,337
More than five years before current fiscal year	214,095	183,341
Revolving Loans Amortized Cost Basis	4,415	7,986
Revolving Loans Converted to Term Loans	2,077	0
Loans	435,478	367,479
Commercial real estate | Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year		0
Year two, fiscal year before current fiscal year		0
Year three, two years before current fiscal year		0
Year four, three years before current fiscal year		0
Year five, four years before current fiscal year		0
More than five years before current fiscal year		162
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans		0
Loans		162
Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	760,480	955,349
Year two, fiscal year before current fiscal year	675,097	524,647
Year three, two years before current fiscal year	276,612	61,131
Year four, three years before current fiscal year	10,318	23,819
Year five, four years before current fiscal year	40,584	8,676
More than five years before current fiscal year	61,228	51,941
Revolving Loans Amortized Cost Basis	1,762,890	2,075,272
Revolving Loans Converted to Term Loans	139,599	0
Loans	3,726,808	3,700,835
Commercial real estate | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	753,759	942,380
Year two, fiscal year before current fiscal year	655,198	512,046
Year three, two years before current fiscal year	267,336	61,131
Year four, three years before current fiscal year	10,318	22,845
Year five, four years before current fiscal year	40,584	8,676
More than five years before current fiscal year	43,560	20,599
Revolving Loans Amortized Cost Basis	1,762,890	2,040,866
Revolving Loans Converted to Term Loans	139,599	0
Loans	3,673,244	3,608,543
Commercial real estate | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year		0
Year two, fiscal year before current fiscal year		0
Year three, two years before current fiscal year		0
Year four, three years before current fiscal year		0
Year five, four years before current fiscal year		0
More than five years before current fiscal year		0
Revolving Loans Amortized Cost Basis		14,268
Revolving Loans Converted to Term Loans		0
Loans		14,268
Commercial real estate | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	6,721	12,969
Year two, fiscal year before current fiscal year	0	12,601
Year three, two years before current fiscal year	9,276	0
Year four, three years before current fiscal year	0	974
Year five, four years before current fiscal year	0	0
More than five years before current fiscal year	17,668	17,599
Revolving Loans Amortized Cost Basis	0	20,138
Revolving Loans Converted to Term Loans	0	0
Loans	33,665	64,281
Commercial real estate | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	0
Year two, fiscal year before current fiscal year	19,899	0
Year three, two years before current fiscal year	0	0
Year four, three years before current fiscal year	0	0
Year five, four years before current fiscal year	0	0
More than five years before current fiscal year	0	13,743
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Loans	19,899	$ 13,743
Commercial and Industrial and Commercial Real Estate
Gross loan charge-offs
2023	307
2022	12,919
2021	28,438
2020	6,946
2019	5,031
Prior to 2019	13,446
Revolving Loans Amortized Cost Basis	3,729
Revolving Loans Converted to Term Loans	145
Total	$ 70,961