Loans and Allowance for Credit Losses for Loans - Internal Loan Classification Risk by Loan Portfolio Class by Origination Year (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 43,560,777	$ 34,153,657
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,091,328	1,575,480
Year two, fiscal year before current fiscal year	1,332,657	749,183
Year three, two years before current fiscal year	746,587	470,111
Year four, three years before current fiscal year	417,251	383,968
Year five, four years before current fiscal year	316,102	162,744
More than five years before current fiscal year	511,623	415,369
Revolving Loans Amortized Cost Basis	4,098,650	2,090,300
Revolving Loans Converted to Term Loans	260	396
Total	8,514,458	5,847,551
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,087,572	1,563,050
Year two, fiscal year before current fiscal year	1,322,828	743,165
Year three, two years before current fiscal year	740,213	461,022
Year four, three years before current fiscal year	407,985	362,748
Year five, four years before current fiscal year	306,393	143,753
More than five years before current fiscal year	423,058	337,713
Revolving Loans Amortized Cost Basis	3,964,927	1,968,513
Revolving Loans Converted to Term Loans	184	247
Total	8,253,160	5,580,211
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	2,654	4,182
Year two, fiscal year before current fiscal year	7,639	1,195
Year three, two years before current fiscal year	670	3,217
Year four, three years before current fiscal year	2,827	14,143
Year five, four years before current fiscal year	4,987	1,726
More than five years before current fiscal year	5,708	9,869
Revolving Loans Amortized Cost Basis	57,210	102,145
Revolving Loans Converted to Term Loans	10	40
Total	81,705	136,517
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	8,248
Year two, fiscal year before current fiscal year	2,049	4,823
Year three, two years before current fiscal year	5,704	3,139
Year four, three years before current fiscal year	3,727	7,077
Year five, four years before current fiscal year	4,722	910
More than five years before current fiscal year	4,790	408
Revolving Loans Amortized Cost Basis	70,131	19,642
Revolving Loans Converted to Term Loans	66	109
Total	91,189	44,356
Commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,102	0
Year two, fiscal year before current fiscal year	141	0
Year three, two years before current fiscal year	0	2,733
Year four, three years before current fiscal year	2,712	0
Year five, four years before current fiscal year	0	16,355
More than five years before current fiscal year	78,067	67,379
Revolving Loans Amortized Cost Basis	6,382	0
Revolving Loans Converted to Term Loans	0	0
Total	88,404	86,467
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	26,909,459	20,790,066
Commercial real estate | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	3,777,444	4,526,352
Year two, fiscal year before current fiscal year	5,464,142	3,067,814
Year three, two years before current fiscal year	3,493,845	2,778,520
Year four, three years before current fiscal year	2,827,365	1,820,340
Year five, four years before current fiscal year	1,783,066	1,611,334
More than five years before current fiscal year	5,864,022	4,869,778
Revolving Loans Amortized Cost Basis	312,009	247,968
Revolving Loans Converted to Term Loans	13,193	13,380
Total	23,535,086	18,935,486
Commercial real estate | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	3,704,273	4,517,917
Year two, fiscal year before current fiscal year	5,379,241	2,983,140
Year three, two years before current fiscal year	3,371,598	2,702,580
Year four, three years before current fiscal year	2,752,901	1,734,922
Year five, four years before current fiscal year	1,659,319	1,474,770
More than five years before current fiscal year	5,504,795	4,557,011
Revolving Loans Amortized Cost Basis	288,599	195,851
Revolving Loans Converted to Term Loans	13,193	13,380
Total	22,673,919	18,179,571
Commercial real estate | Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	73,171	7,700
Year two, fiscal year before current fiscal year	40,956	50,019
Year three, two years before current fiscal year	82,875	46,911
Year four, three years before current fiscal year	34,661	44,187
Year five, four years before current fiscal year	64,861	65,623
More than five years before current fiscal year	129,785	143,540
Revolving Loans Amortized Cost Basis	15,052	50,168
Revolving Loans Converted to Term Loans	0	0
Total	441,361	408,148
Commercial real estate | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	735
Year two, fiscal year before current fiscal year	43,945	34,655
Year three, two years before current fiscal year	39,372	29,029
Year four, three years before current fiscal year	39,803	41,231
Year five, four years before current fiscal year	58,886	70,941
More than five years before current fiscal year	229,266	169,041
Revolving Loans Amortized Cost Basis	8,358	1,949
Revolving Loans Converted to Term Loans	0	0
Total	419,630	347,581
Commercial real estate | Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	0
Year two, fiscal year before current fiscal year	0	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	176	186
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	176	186
Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	501,643	278,427
Year two, fiscal year before current fiscal year	645,101	98,628
Year three, two years before current fiscal year	169,060	49,570
Year four, three years before current fiscal year	59,657	33,027
Year five, four years before current fiscal year	10,664	6,061
More than five years before current fiscal year	42,705	46,261
Revolving Loans Amortized Cost Basis	1,945,543	1,342,606
Revolving Loans Converted to Term Loans	0	0
Total	3,374,373	1,854,580
Commercial real estate | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	472,849	274,097
Year two, fiscal year before current fiscal year	631,399	98,609
Year three, two years before current fiscal year	157,587	48,555
Year four, three years before current fiscal year	59,657	32,781
Year five, four years before current fiscal year	10,664	6,061
More than five years before current fiscal year	25,089	28,419
Revolving Loans Amortized Cost Basis	1,900,402	1,313,555
Revolving Loans Converted to Term Loans	0	0
Total	3,257,647	1,802,077
Commercial real estate | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	28,296	4,131
Year two, fiscal year before current fiscal year	0	0
Year three, two years before current fiscal year	0	1,009
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	0
Revolving Loans Amortized Cost Basis	25,610	18,449
Revolving Loans Converted to Term Loans	0	0
Total	53,906	23,589
Commercial real estate | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	199
Year two, fiscal year before current fiscal year	13,059	19
Year three, two years before current fiscal year	0	6
Year four, three years before current fiscal year	0	246
Year five, four years before current fiscal year	0	0
More than five years before current fiscal year	17,616	17,842
Revolving Loans Amortized Cost Basis	19,531	10,602
Revolving Loans Converted to Term Loans	0	0
Total	50,206	$ 28,914
Commercial real estate | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	498
Year two, fiscal year before current fiscal year	643
Year three, two years before current fiscal year	11,473
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	0
Revolving Loans Converted to Term Loans	0
Total	$ 12,614