Loans and Allowance for Credit Losses for Loans - Internal Loan Classification Risk by Loan Portfolio Class by Origination Year (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 45,185,764	$ 34,153,657
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,466,507	1,575,480
Year two, fiscal year before current fiscal year	1,199,649	749,183
Year three, two years before current fiscal year	689,152	470,111
Year four, three years before current fiscal year	362,585	383,968
Year five, four years before current fiscal year	296,226	162,744
More than five years before current fiscal year	481,492	415,369
Revolving Loans Amortized Cost Basis	4,205,599	2,090,300
Revolving Loans Converted to Term Loans	168	396
Total	8,701,377	5,847,551
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,451,283	1,563,050
Year two, fiscal year before current fiscal year	1,193,937	743,165
Year three, two years before current fiscal year	663,575	461,022
Year four, three years before current fiscal year	352,556	362,748
Year five, four years before current fiscal year	279,803	143,753
More than five years before current fiscal year	395,216	337,713
Revolving Loans Amortized Cost Basis	4,076,834	1,968,513
Revolving Loans Converted to Term Loans	159	247
Total	8,413,362	5,580,211
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	15,224	4,182
Year two, fiscal year before current fiscal year	3,433	1,195
Year three, two years before current fiscal year	20,292	3,217
Year four, three years before current fiscal year	5,246	14,143
Year five, four years before current fiscal year	9,320	1,726
More than five years before current fiscal year	3,852	9,869
Revolving Loans Amortized Cost Basis	56,973	102,145
Revolving Loans Converted to Term Loans	9	40
Total	114,349	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	2,279	4,823
Year three, two years before current fiscal year	5,285	3,139
Year four, three years before current fiscal year	2,082	7,077
Year five, four years before current fiscal year	4,467	910
More than five years before current fiscal year	5,312	408
Revolving Loans Amortized Cost Basis	71,792	19,642
Revolving Loans Converted to Term Loans	0	109
Total	91,217	44,356
Commercial and industrial | 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	2,733
Year four, three years before current fiscal year	2,701	0
Year five, four years before current fiscal year	2,636	16,355
More than five years before current fiscal year	77,112	67,379
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	82,449	86,467
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	28,065,263	20,790,066
Commercial real estate | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	5,446,636	4,526,352
Year two, fiscal year before current fiscal year	5,288,749	3,067,814
Year three, two years before current fiscal year	3,408,453	2,778,520
Year four, three years before current fiscal year	2,817,571	1,820,340
Year five, four years before current fiscal year	1,692,061	1,611,334
More than five years before current fiscal year	5,528,036	4,869,778
Revolving Loans Amortized Cost Basis	308,337	247,968
Revolving Loans Converted to Term Loans	3,599	13,380
Total	24,493,445	18,935,486
Commercial real estate | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	5,326,845	4,517,917
Year two, fiscal year before current fiscal year	5,193,267	2,983,140
Year three, two years before current fiscal year	3,280,227	2,702,580
Year four, three years before current fiscal year	2,733,365	1,734,922
Year five, four years before current fiscal year	1,553,479	1,474,770
More than five years before current fiscal year	5,161,982	4,557,011
Revolving Loans Amortized Cost Basis	284,891	195,851
Revolving Loans Converted to Term Loans	3,599	13,380
Total	23,537,657	18,179,571
Commercial real estate | Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	102,150	7,700
Year two, fiscal year before current fiscal year	63,572	50,019
Year three, two years before current fiscal year	90,429	46,911
Year four, three years before current fiscal year	43,812	44,187
Year five, four years before current fiscal year	75,328	65,623
More than five years before current fiscal year	155,873	143,540
Revolving Loans Amortized Cost Basis	15,074	50,168
Revolving Loans Converted to Term Loans	0	0
Total	546,239	408,148
Commercial real estate | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	17,641	735
Year two, fiscal year before current fiscal year	31,910	34,655
Year three, two years before current fiscal year	37,797	29,029
Year four, three years before current fiscal year	40,394	41,231
Year five, four years before current fiscal year	63,254	70,941
More than five years before current fiscal year	210,011	169,041
Revolving Loans Amortized Cost Basis	8,372	1,949
Revolving Loans Converted to Term Loans	0	0
Total	409,379	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	170	186
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	170	186
Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	756,637	278,427
Year two, fiscal year before current fiscal year	619,460	98,628
Year three, two years before current fiscal year	120,837	49,570
Year four, three years before current fiscal year	31,228	33,027
Year five, four years before current fiscal year	10,572	6,061
More than five years before current fiscal year	47,032	46,261
Revolving Loans Amortized Cost Basis	1,986,053	1,342,606
Revolving Loans Converted to Term Loans	0	0
Total	3,571,818	1,854,580
Commercial real estate | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	743,720	274,097
Year two, fiscal year before current fiscal year	607,441	98,609
Year three, two years before current fiscal year	120,837	48,555
Year four, three years before current fiscal year	30,246	32,781
Year five, four years before current fiscal year	10,572	6,061
More than five years before current fiscal year	17,069	28,419
Revolving Loans Amortized Cost Basis	1,952,786	1,313,555
Revolving Loans Converted to Term Loans	0	0
Total	3,482,671	1,802,077
Commercial real estate | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	12,917	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
More than five years before current fiscal year	0	0
Revolving Loans Amortized Cost Basis	13,084	18,449
Revolving Loans Converted to Term Loans	0	0
Total	26,001	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	11,376	19
Year three, two years before current fiscal year	0	6
Year four, three years before current fiscal year	982	246
Year five, four years before current fiscal year		0
More than five years before current fiscal year	17,599	17,842
Revolving Loans Amortized Cost Basis	20,183	10,602
Revolving Loans Converted to Term Loans	0	0
Total	50,140	$ 28,914
Commercial real estate | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0
Year two, fiscal year before current fiscal year	643
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
More than five years before current fiscal year	12,364
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans	0
Total	$ 13,006