Allowance for Credit Losses - Summary of Loan grades applied various classes of Commercial and Industrial Loans and Commercial Real Estate Loans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 134,068	$ 131,564
Gross charge-offs	570
Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	29,237	26,199
Gross charge-offs	40
Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,619	1,664
Gross charge-offs	5
Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	18,423
Gross charge-offs	34
Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	21,683	24,854
Gross charge-offs	81
Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	15,025	18,749
Gross charge-offs	47
Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,555	13,071
Gross charge-offs	31
Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,062	12,738
Gross charge-offs	142
Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		7,535
Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	27,464	26,754
Gross charge-offs	190
Commercial, Financial, Leasing, etc. [Member] | Term Loans 2022 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		21
Commercial, Financial, Leasing, etc. [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		170
Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	57,010	51,920
Gross charge-offs	132
Commercial and Industrial [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	24,048	20,669
Gross charge-offs	17
Commercial and Industrial [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	114	65
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	53,251	49,100
Commercial and Industrial [Member] | Pass [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	22,345	19,794
Commercial and Industrial [Member] | Pass [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	70	41
Commercial and Industrial [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,089	2,316
Commercial and Industrial [Member] | Criticized Accrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,460	774
Commercial and Industrial [Member] | Criticized Accrual [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	31	17
Commercial and Industrial [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	670	504
Commercial and Industrial [Member] | Criticized Nonaccrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	243	101
Commercial and Industrial [Member] | Criticized Nonaccrual [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	13	7
Commercial and Industrial [Member] | Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	9,010
Gross charge-offs	10
Commercial and Industrial [Member] | Term Loans 2023 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	8,689
Commercial and Industrial [Member] | Term Loans 2023 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	292
Commercial and Industrial [Member] | Term Loans 2023 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	29
Commercial and Industrial [Member] | Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	8,434	10,497
Gross charge-offs	45
Commercial and Industrial [Member] | Term Loans 2022 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	8,087	10,217
Commercial and Industrial [Member] | Term Loans 2022 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	279	259
Commercial and Industrial [Member] | Term Loans 2022 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	68
Commercial and Industrial [Member] | Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,133	6,874
Gross charge-offs	18
Commercial and Industrial [Member] | Term Loans 2021 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,800	6,582
Commercial and Industrial [Member] | Term Loans 2021 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	277	237
Commercial and Industrial [Member] | Term Loans 2021 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	56	55
Commercial and Industrial [Member] | Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,465	3,411
Gross charge-offs	13
Commercial and Industrial [Member] | Term Loans 2020 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,248	3,110
Commercial and Industrial [Member] | Term Loans 2020 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	142	234
Commercial and Industrial [Member] | Term Loans 2020 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	75	67
Commercial and Industrial [Member] | Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,332	3,210
Gross charge-offs	10
Commercial and Industrial [Member] | Term Loans 2019 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,169	2,989
Commercial and Industrial [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	127
Commercial and Industrial [Member] | Term Loans 2019 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	36	51
Commercial and Industrial [Member] | Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		1,905
Commercial and Industrial [Member] | Term Loans 2018 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		1,752
Commercial and Industrial [Member] | Term Loans 2018 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		98
Commercial and Industrial [Member] | Term Loans 2018 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		55
Commercial and Industrial [Member] | Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,474	5,289
Gross charge-offs	19
Commercial and Industrial [Member] | Term Loans Prior Period [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,843	4,615
Commercial and Industrial [Member] | Term Loans Prior Period [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	481	527
Commercial and Industrial [Member] | Term Loans Prior Period [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	150	147
Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	25,277	26,679
Gross charge-offs	241
Commercial [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	450	586
Commercial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	19,158	21,055
Commercial [Member] | Pass [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	440	521
Commercial [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,250	4,384
Commercial [Member] | Criticized Accrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7	42
Commercial [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	869	1,240
Commercial [Member] | Criticized Nonaccrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3	23
Commercial [Member] | Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,275
Commercial [Member] | Term Loans 2023 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,048
Commercial [Member] | Term Loans 2023 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	227
Commercial [Member] | Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,679	2,816
Commercial [Member] | Term Loans 2022 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,742	2,493
Commercial [Member] | Term Loans 2022 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	891	314
Commercial [Member] | Term Loans 2022 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	46	9
Commercial [Member] | Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,835	2,220
Commercial [Member] | Term Loans 2021 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,367	1,752
Commercial [Member] | Term Loans 2021 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	465	449
Commercial [Member] | Term Loans 2021 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3	19
Commercial [Member] | Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,580	2,882
Commercial [Member] | Term Loans 2020 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,011	2,303
Commercial [Member] | Term Loans 2020 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	456	424
Commercial [Member] | Term Loans 2020 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	113	155
Commercial [Member] | Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,118	4,282
Gross charge-offs	112
Commercial [Member] | Term Loans 2019 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,059	3,365
Commercial [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	966	635
Commercial [Member] | Term Loans 2019 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	93	282
Commercial [Member] | Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		3,420
Commercial [Member] | Term Loans 2018 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		2,359
Commercial [Member] | Term Loans 2018 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		910
Commercial [Member] | Term Loans 2018 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		151
Commercial [Member] | Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,340	10,473
Gross charge-offs	129
Commercial [Member] | Term Loans Prior Period [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	8,491	8,262
Commercial [Member] | Term Loans Prior Period [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,238	1,610
Commercial [Member] | Term Loans Prior Period [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	611
Residential Builder and Developer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,073	1,315
Gross charge-offs	2
Residential Builder and Developer [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	119	181
Gross charge-offs	2
Residential Builder and Developer [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	959	1,118
Residential Builder and Developer [Member] | Pass [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	116	150
Residential Builder and Developer [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	111	196
Residential Builder and Developer [Member] | Criticized Accrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3	31
Residential Builder and Developer [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3	1
Residential Builder and Developer [Member] | Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	531
Residential Builder and Developer [Member] | Term Loans 2023 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	530
Residential Builder and Developer [Member] | Term Loans 2023 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1
Residential Builder and Developer [Member] | Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	270	685
Residential Builder and Developer [Member] | Term Loans 2022 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	252	682
Residential Builder and Developer [Member] | Term Loans 2022 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	18	3
Residential Builder and Developer [Member] | Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	74	259
Residential Builder and Developer [Member] | Term Loans 2021 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	41	230
Residential Builder and Developer [Member] | Term Loans 2021 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	30	28
Residential Builder and Developer [Member] | Term Loans 2021 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3	1
Residential Builder and Developer [Member] | Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6	21
Residential Builder and Developer [Member] | Term Loans 2020 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6	11
Residential Builder and Developer [Member] | Term Loans 2020 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		10
Residential Builder and Developer [Member] | Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	61	131
Residential Builder and Developer [Member] | Term Loans 2019 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2	22
Residential Builder and Developer [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	59	109
Residential Builder and Developer [Member] | Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		28
Residential Builder and Developer [Member] | Term Loans 2018 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		13
Residential Builder and Developer [Member] | Term Loans 2018 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		15
Residential Builder and Developer [Member] | Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	12	10
Residential Builder and Developer [Member] | Term Loans Prior Period [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	12	10
Residential Builder and Developer [Member] | Term Loans Prior Period [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		601
Other Commercial Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6,653	7,302
Gross charge-offs	10
Other Commercial Construction [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	32	18
Other Commercial Construction [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,066	5,204
Other Commercial Construction [Member] | Pass [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	30	16
Other Commercial Construction [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,416	1,973
Other Commercial Construction [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	171	125
Other Commercial Construction [Member] | Criticized Nonaccrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2	2
Other Commercial Construction [Member] | Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	866
Other Commercial Construction [Member] | Term Loans 2023 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	813
Other Commercial Construction [Member] | Term Loans 2023 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	53
Other Commercial Construction [Member] | Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,771	1,071
Other Commercial Construction [Member] | Term Loans 2022 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,366	1,033
Other Commercial Construction [Member] | Term Loans 2022 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	391	38
Other Commercial Construction [Member] | Term Loans 2022 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	14
Other Commercial Construction [Member] | Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,051	1,235
Other Commercial Construction [Member] | Term Loans 2021 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	651	1,080
Other Commercial Construction [Member] | Term Loans 2021 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	390	145
Other Commercial Construction [Member] | Term Loans 2021 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10	10
Other Commercial Construction [Member] | Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,110	1,591
Other Commercial Construction [Member] | Term Loans 2020 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	373	1,226
Other Commercial Construction [Member] | Term Loans 2020 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	691	321
Other Commercial Construction [Member] | Term Loans 2020 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	46	44
Other Commercial Construction [Member] | Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,261	2,247
Gross charge-offs	3
Other Commercial Construction [Member] | Term Loans 2019 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	646	1,186
Other Commercial Construction [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	565	1,025
Other Commercial Construction [Member] | Term Loans 2019 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	50	36
Other Commercial Construction [Member] | Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		677
Other Commercial Construction [Member] | Term Loans 2018 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		367
Other Commercial Construction [Member] | Term Loans 2018 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		299
Other Commercial Construction [Member] | Term Loans 2018 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		11
Other Commercial Construction [Member] | Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	562	463
Gross charge-offs	7
Other Commercial Construction [Member] | Term Loans Prior Period [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	187	296
Other Commercial Construction [Member] | Term Loans Prior Period [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	326	145
Other Commercial Construction [Member] | Term Loans Prior Period [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 49	$ 22