Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 38,283,556	$ 37,187,814
Accrual substandard loans	266,400	288,800
Deferred fees and costs, net	$ 25,500	25,400
Maximum
Financing Receivable, Credit Quality Indicator [Line Items]
Allowance for loan losses, percent of loan amount	50.00%
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		36,572,183
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		225,218
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		385,862
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,281
Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		3,270
Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 17,661,442	16,782,670
Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	11,018,155	10,252,859
Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,643,287	6,529,811
Total commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		16,326,414
Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,692,357	9,940,359
Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,490,503	6,386,055
Total commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		186,836
Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	132,172	128,506
Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	43,483	58,330
Total commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		268,257
Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	184,775	182,831
Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	109,301	85,426
Total commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,163
Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,851	1,163
Total commercial and industrial | Doubtful | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial and industrial | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial and industrial | Loss | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial and industrial | Loss | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,671,201	10,480,484
Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,257,791	9,042,679
Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	751,468	780,015
Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	661,942	657,790
Total commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		10,364,592
Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,184,091	8,968,712
Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	735,860	766,529
Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	632,717	629,351
Total commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		38,382
Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17,950	16,490
Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,509	3,249
Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	18,923	18,643
Total commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		77,510
Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	55,750	57,477
Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,099	10,237
Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,302	9,796
Total commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Doubtful | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Doubtful | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Doubtful | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Loss | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Loss | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Loss | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,950,913	9,924,660
Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,608,121	5,546,368
Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,778,862	1,713,157
Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	261,581	268,841
Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,302,349	2,396,294
Total consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		9,881,177
Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,594,265	5,527,746
Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,760,126	1,697,086
Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	258,904	266,146
Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,294,030	2,390,199
Total consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Special Mention | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Special Mention | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Special Mention | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Special Mention | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		40,095
Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,782	18,376
Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17,773	14,806
Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	736	818
Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,319	6,095
Total consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		118
Total consumer | Doubtful | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		97
Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	37	21
Total consumer | Doubtful | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Doubtful | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		3,270
Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	74	149
Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	926	1,244
Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,941	1,877
Total consumer | Loss | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		$ 0
Revolving Loans Amortized Cost Basis
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,874,421
Revolving Loans Amortized Cost Basis | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,334,339
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,050,268
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	284,071
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,922,661
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	284,048
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	57,251
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	63,437
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	23
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,919
Revolving Loans Amortized Cost Basis | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	352,898
Revolving Loans Amortized Cost Basis | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	184,095
Revolving Loans Amortized Cost Basis | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	72,864
Revolving Loans Amortized Cost Basis | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	95,939
Revolving Loans Amortized Cost Basis | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	184,095
Revolving Loans Amortized Cost Basis | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	70,505
Revolving Loans Amortized Cost Basis | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	90,201
Revolving Loans Amortized Cost Basis | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,273
Revolving Loans Amortized Cost Basis | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,738
Revolving Loans Amortized Cost Basis | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	86
Revolving Loans Amortized Cost Basis | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,187,184
Revolving Loans Amortized Cost Basis | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	880
Revolving Loans Amortized Cost Basis | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,679,204
Revolving Loans Amortized Cost Basis | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	261,581
Revolving Loans Amortized Cost Basis | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	245,519
Revolving Loans Amortized Cost Basis | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	880
Revolving Loans Amortized Cost Basis | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,666,627
Revolving Loans Amortized Cost Basis | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	258,904
Revolving Loans Amortized Cost Basis | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	245,304
Revolving Loans Amortized Cost Basis | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	11,824
Revolving Loans Amortized Cost Basis | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	736
Revolving Loans Amortized Cost Basis | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	215
Revolving Loans Amortized Cost Basis | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17
Revolving Loans Amortized Cost Basis | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	736
Revolving Loans Amortized Cost Basis | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,941
Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	182,242
Revolving Loans Converted to Term Loans | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	82,584
Revolving Loans Converted to Term Loans | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	82,584
Revolving Loans Converted to Term Loans | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	78,912
Revolving Loans Converted to Term Loans | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,223
Revolving Loans Converted to Term Loans | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	721
Revolving Loans Converted to Term Loans | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	728
Revolving Loans Converted to Term Loans | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	99,658
Revolving Loans Converted to Term Loans | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	99,658
Revolving Loans Converted to Term Loans | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	93,499
Revolving Loans Converted to Term Loans | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,949
Revolving Loans Converted to Term Loans | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	20
Revolving Loans Converted to Term Loans | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	190
Revolving Loans Converted to Term Loans | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,800,458
2020 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	942,173
2020 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	555,472
2020 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	386,701
2020 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	550,653
2020 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	386,363
2020 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,884
2020 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,935
2020 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	338
2020 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	457,395
2020 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	388,783
2020 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	47,293
2020 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	21,319
2020 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	387,787
2020 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	47,219
2020 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	21,204
2020 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	836
2020 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5
2020 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	160
2020 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	69
2020 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	115
2020 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	400,890
2020 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	279,510
2020 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	121,380
2020 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	279,510
2020 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	121,380
2020 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,224,342
2019 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,904,925
2019 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,677,914
2019 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,227,011
2019 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,657,933
2019 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,213,917
2019 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,304
2019 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,742
2019 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,677
2019 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,352
2019 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,379,887
2019 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,963,570
2019 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	208,347
2019 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	207,970
2019 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,961,810
2019 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	203,421
2019 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	205,099
2019 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	92
2019 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,006
2019 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,544
2019 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,668
2019 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,920
2019 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,327
2019 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,939,530
2019 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,150,016
2019 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	789,514
2019 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,149,232
2019 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	788,397
2019 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	784
2019 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,117
2019 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,195,632
2018 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,494,866
2018 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,180,100
2018 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,314,766
2018 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,115,403
2018 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,271,307
2018 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	18,293
2018 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,000
2018 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	46,404
2018 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	38,459
2018 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,559,947
2018 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,342,891
2018 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	106,770
2018 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	110,286
2018 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,339,056
2018 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	103,044
2018 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	104,987
2018 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,117
2018 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,394
2018 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,718
2018 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,726
2018 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,905
2018 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,140,819
2018 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	701,471
2018 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	439,348
2018 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	701,190
2018 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	438,760
2018 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	281
2018 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	588
2018 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,234,049
2017 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,966,064
2017 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	806,908
2017 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,159,156
2017 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	769,493
2017 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,116,905
2017 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	30,775
2017 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,431
2017 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,442
2017 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	29,820
2017 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	198
2017 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,905,784
2017 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,697,406
2017 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	119,114
2017 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	89,264
2017 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,690,528
2017 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	118,126
2017 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	87,990
2017 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,754
2017 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	639
2017 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,124
2017 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	988
2017 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	635
2017 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,362,201
2017 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	944,453
2017 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	417,748
2017 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	942,965
2017 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	413,899
2017 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,488
2017 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,849
2017 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,407,184
2016 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,379,823
2016 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	656,089
2016 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	723,734
2016 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	642,584
2016 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	714,764
2016 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,090
2016 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,058
2016 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,500
2016 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,912
2016 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	915
2016 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	940,066
2016 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	856,721
2016 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	55,954
2016 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	27,391
2016 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	855,438
2016 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	54,752
2016 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	26,427
2016 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5
2016 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	815
2016 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,278
2016 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	387
2016 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	964
2016 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,087,295
2016 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	900,185
2016 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	187,110
2016 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	898,374
2016 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	185,671
2016 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,811
2016 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,439
2016 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,365,228
Prior | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,556,668
Prior | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,008,820
Prior | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,547,848
Prior | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	954,718
Prior | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,503,199
Prior | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,352
Prior | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	15,252
Prior | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	40,659
Prior | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	29,397
Prior | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	91
Prior | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,075,224
Prior | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,824,325
Prior | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	141,126
Prior | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	109,773
Prior | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,765,377
Prior | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	138,793
Prior | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	96,809
Prior | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,146
Prior | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	410
Prior | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,608
Prior | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	48,802
Prior | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,923
Prior | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,356
Prior | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,733,336
Prior | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,631,606
Prior | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	101,730
Prior | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,622,114
Prior | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	100,619
Prior | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,418
Prior | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,111
Prior | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	74
Prior | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 0