Non-performing Loans and Impaired Loans - Loans by Credit Grades (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 3,978,382	$ 3,634,596
Percentage of total loans		100.00%
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	431,020
2019	284,236
2018	258,656
2017	323,389
2016	212,616
Prior	546,567
Revolving Loans	256,231
Total Loans	2,312,715	$ 2,047,646
Commercial | Owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	27,338
2019	66,857
2018	64,765
2017	59,910
2016	59,022
Prior	180,730
Revolving Loans	42,576
Total Loans	501,198	519,577
Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	71,213
2019	140,000
2018	113,659
2017	153,922
2016	118,198
Prior	251,262
Revolving Loans	160,862
Total Loans	1,009,116	973,331
Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	318
2016	679
Prior	1,905
Revolving Loans	9,134
Total Loans	12,036	12,925
Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	30
2019	912
2018	2,449
2017	4,815
2016	804
Prior	13,489
Revolving Loans	6,488
Total Loans	28,987	35,954
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	332,439
2019	76,467
2018	77,783
2017	104,424
2016	33,913
Prior	99,181
Revolving Loans	37,171
Total Loans	761,378	505,859
Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	59,698
2019	69,063
2018	119,779
2017	115,690
2016	86,516
Prior	231,300
Revolving Loans	322,750
Total Loans	1,004,796	920,998
Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	59,698
2019	69,063
2018	119,779
2017	115,690
2016	86,516
Prior	231,300
Revolving Loans	649
Total Loans	682,695	751,019
Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	21,715
Total Loans	21,715	19,686
Real estate | Mortgage warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	300,386
Total Loans	300,386	150,293
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	107,815
2019	182,134
2018	147,481
2017	91,283
2016	42,605
Prior	83,423
Revolving Loans	6,130
Total Loans	660,871	665,952
Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,706
2019	12,340
2018	7,516
2017	7,401
2016	3,008
Prior	2,530
Revolving Loans	14
Total Loans	39,515	41,079
Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	72,828
2019	119,418
2018	96,834
2017	50,664
2016	12,643
Prior	8,254
Revolving Loans	0
Total Loans	360,641	348,658
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	28,281
2019	50,376
2018	43,131
2017	33,218
2016	26,954
Prior	72,639
Revolving Loans	6,116
Total Loans	260,715	276,215
Performing | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	59,698
2019	68,882
2018	119,632
2017	115,321
2016	85,206
Prior	223,362
Revolving Loans	649
Total Loans	672,750
Performing | Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	21,715
Total Loans	21,715
Performing | Real estate | Mortgage warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	300,386
Total Loans	300,386
Performing | Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,706
2019	12,336
2018	7,486
2017	7,381
2016	3,002
Prior	2,523
Revolving Loans	14
Total Loans	39,448
Performing | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	72,828
2019	119,252
2018	96,562
2017	50,133
2016	12,502
Prior	8,044
Revolving Loans	0
Total Loans	359,321
Performing | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	28,281
2019	50,367
2018	43,076
2017	33,139
2016	26,902
Prior	71,516
Revolving Loans	4,948
Total Loans	258,229
Non-performing | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	181
2018	147
2017	369
2016	1,310
Prior	7,938
Revolving Loans	0
Total Loans	9,945
Non-performing | Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	0
Non-performing | Real estate | Mortgage warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	0
Non-performing | Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	4
2018	30
2017	20
2016	6
Prior	7
Revolving Loans	0
Total Loans	67
Non-performing | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	166
2018	272
2017	531
2016	141
Prior	210
Revolving Loans	0
Total Loans	1,320
Non-performing | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	9
2018	55
2017	79
2016	52
Prior	1,123
Revolving Loans	1,168
Total Loans	2,486
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 3,541,122
Percentage of total loans		97.43%
Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 1,968,009
Pass | Commercial | Owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	27,165
2019	65,335
2018	55,867
2017	54,371
2016	56,131
Prior	161,463
Revolving Loans	38,697
Total Loans	459,029	492,386
Pass | Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	68,736
2019	129,273
2018	83,742
2017	143,870
2016	114,786
Prior	231,098
Revolving Loans	159,787
Total Loans	931,292	957,990
Pass | Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	318
2016	679
Prior	1,905
Revolving Loans	7,889
Total Loans	10,791	12,925
Pass | Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	30
2019	912
2018	2,449
2017	4,815
2016	804
Prior	13,356
Revolving Loans	6,488
Total Loans	28,854	35,815
Pass | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	321,761
2019	66,704
2018	66,203
2017	96,404
2016	30,716
Prior	83,437
Revolving Loans	33,185
Total Loans	698,410	468,893
Pass | Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		911,115
Pass | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		741,136
Pass | Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		19,686
Pass | Real estate | Mortgage warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		150,293
Pass | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		661,998
Pass | Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		41,044
Pass | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		347,289
Pass | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		273,665
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 34,804
Percentage of total loans		0.96%
Special Mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 34,804
Special Mention | Commercial | Owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	173
2019	291
2018	4,983
2017	4,393
2016	2,394
Prior	11,132
Revolving Loans	0
Total Loans	23,366	8,328
Special Mention | Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,477
2019	10,727
2018	27,479
2017	9,421
2016	2,959
Prior	15,174
Revolving Loans	1,075
Total Loans	69,312	7,824
Special Mention | Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	1,245
Total Loans	1,245	0
Special Mention | Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	133
Revolving Loans	0
Total Loans	133	0
Special Mention | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	8,027
2019	4,012
2018	8,027
2017	6,321
2016	2,363
Prior	12,088
Revolving Loans	1,914
Total Loans	42,752	18,652
Special Mention | Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Special Mention | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Special Mention | Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Special Mention | Real estate | Mortgage warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Special Mention | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Special Mention | Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Special Mention | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Special Mention | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 58,670
Percentage of total loans		1.61%
Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 44,833
Substandard | Commercial | Owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	1,231
2018	3,915
2017	1,146
2016	497
Prior	8,135
Revolving Loans	3,879
Total Loans	18,803	18,863
Substandard | Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	2,438
2017	631
2016	453
Prior	4,990
Revolving Loans	0
Total Loans	8,512	7,517
Substandard | Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	0	0
Substandard | Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	0	139
Substandard | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,651
2019	5,751
2018	3,553
2017	1,699
2016	834
Prior	3,656
Revolving Loans	2,072
Total Loans	20,216	18,314
Substandard | Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		9,883
Substandard | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		9,883
Substandard | Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Substandard | Real estate | Mortgage warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Substandard | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		3,954
Substandard | Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		35
Substandard | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		1,369
Substandard | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		2,550
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 0
Percentage of total loans		0.00%
Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 0
Doubtful | Commercial | Owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	0	0
Doubtful | Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	0	0
Doubtful | Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	0	0
Doubtful | Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	0	0
Doubtful | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	0
Total Loans	$ 0	0
Doubtful | Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Doubtful | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Doubtful | Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Doubtful | Real estate | Mortgage warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Doubtful | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Doubtful | Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Doubtful | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0
Doubtful | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		$ 0