Loans and Leases - Credit Quality (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Commercial Financial And Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 103,182
2019	113,530
2018	86,406
2017	61,038
2016	32,468
Prior	74,960
Revolving loans amortized cost basis	351,149
Total	822,733
Commercial Financial And Agricultural [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	99,875
2019	111,696
2018	83,979
2017	58,363
2016	31,043
Prior	72,877
Revolving loans amortized cost basis	335,029
Total	792,862
Commercial Financial And Agricultural [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,132
2019	889
2018	1,523
2017	2,614
2016	1,425
Prior	1,449
Revolving loans amortized cost basis	4,755
Total	15,787
Commercial Financial And Agricultural [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	175
2019	945
2018	904
2017	61
2016	0
Prior	634
Revolving loans amortized cost basis	11,365
Total	14,084
Paycheck Protection Program Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2020	498,978
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Total	498,978
Paycheck Protection Program Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	498,978
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Total	498,978
Paycheck Protection Program Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Total	0
Paycheck Protection Program Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Total	0
Real-Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	516,741
2019	558,647
2018	314,724
2017	330,434
2016	189,289
Prior	266,396
Revolving loans amortized cost basis	46,259
Total	2,222,490
Real-Estate Commercial [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	514,960
2019	545,207
2018	313,670
2017	318,237
2016	184,112
Prior	254,494
Revolving loans amortized cost basis	45,183
Total	2,175,863
Real-Estate Commercial [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,781
2019	12,502
2018	0
2017	1,127
2016	5,177
Prior	2,143
Revolving loans amortized cost basis	288
Total	23,018
Real-Estate Commercial [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	938
2018	1,054
2017	11,070
2016	0
Prior	9,759
Revolving loans amortized cost basis	788
Total	23,609
Real-Estate Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	64,635
2019	86,261
2018	52,692
2017	2,276
2016	2,950
Prior	0
Revolving loans amortized cost basis	3,720
Total	212,534
Real-Estate Construction [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	44,289
2019	86,261
2018	52,692
2017	2,276
2016	2,950
Prior	0
Revolving loans amortized cost basis	3,720
Total	192,188
Real-Estate Construction [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	20,346
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Total	20,346
Real-Estate Construction [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Total	0
Real Estate Residential Secured For Business Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	55,256
2019	81,411
2018	63,984
2017	53,076
2016	45,337
Prior	49,319
Revolving loans amortized cost basis	27,667
Total	376,050
Real Estate Residential Secured For Business Purpose [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	54,425
2019	80,480
2018	63,984
2017	52,922
2016	43,840
Prior	47,584
Revolving loans amortized cost basis	27,599
Total	370,834
Real Estate Residential Secured For Business Purpose [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	831
2019	468
2018	0
2017	78
2016	734
Prior	800
Revolving loans amortized cost basis	0
Total	2,911
Real Estate Residential Secured For Business Purpose [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	463
2018	0
2017	76
2016	763
Prior	935
Revolving loans amortized cost basis	68
Total	2,305
Real Estate Residential Secured For Personal Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	74,240
2019	82,989
2018	77,478
2017	64,408
2016	49,501
Prior	112,278
Revolving loans amortized cost basis	1,618
Total	462,512
Real Estate Residential Secured For Personal Purpose [Member] | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	74,240
2019	82,989
2018	77,421
2017	64,408
2016	49,501
Prior	111,067
Revolving loans amortized cost basis	1,618
Total	461,244
Real Estate Residential Secured For Personal Purpose [Member] | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	57
2017	0
2016	0
Prior	1,211
Revolving loans amortized cost basis	0
Total	1,268
Real Estate Home Equity Secured For Personal Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	387
2019	994
2018	1,350
2017	1,431
2016	609
Prior	2,990
Revolving loans amortized cost basis	165,280
Total	173,041
Real Estate Home Equity Secured For Personal Purpose [Member] | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	387
2019	994
2018	1,245
2017	1,431
2016	609
Prior	2,947
Revolving loans amortized cost basis	164,398
Total	172,011
Real Estate Home Equity Secured For Personal Purpose [Member] | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	105
2017	0
2016	0
Prior	43
Revolving loans amortized cost basis	882
Total	1,030
Loans to Individuals [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,349
2019	2,022
2018	1,308
2017	658
2016	396
Prior	2,638
Revolving loans amortized cost basis	20,851
Total	29,222
Loans to Individuals [Member] | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,349
2019	2,022
2018	1,308
2017	658
2016	396
Prior	2,560
Revolving loans amortized cost basis	20,836
Total	29,129
Loans to Individuals [Member] | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	78
Revolving loans amortized cost basis	15
Total	93
Lease Financings [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	32,754
2019	55,030
2018	39,987
2017	17,320
2016	7,507
Prior	1,651
Revolving loans amortized cost basis	0
Total	154,249
Lease Financings [Member] | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	32,754
2019	54,928
2018	39,881
2017	16,981
2016	7,441
Prior	1,629
Revolving loans amortized cost basis	0
Total	153,614
Lease Financings [Member] | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	102
2018	106
2017	339
2016	66
Prior	22
Revolving loans amortized cost basis	0
Total	$ 635