Non-performing Loans - Loans by Credit Grades (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 4,030,365	$ 3,634,596
Percentage of total loans		100.00%
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	494,491
2019	279,736
2018	247,726
2017	310,716
2016	204,823
Prior	508,026
Revolving Loans	276,090
Total Loans	2,321,608	$ 2,047,646
Commercial | Owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	44,554
2019	68,082
2018	62,356
2017	63,530
2016	58,556
Prior	164,625
Revolving Loans	41,424
Total Loans	503,127	519,577
Commercial | Non–owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	98,654
2019	137,866
2018	104,885
2017	144,189
2016	114,993
Prior	244,540
Revolving Loans	174,044
Total Loans	1,019,171	973,331
Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	495
2019	212
2018	0
2017	1,660
2016	0
Prior	1,237
Revolving Loans	7,586
Total Loans	11,190	12,925
Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	30
2019	885
2018	267
2017	2,232
2016	777
Prior	13,029
Revolving Loans	9,165
Total Loans	26,385	35,954
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	350,758
2019	72,691
2018	80,218
2017	99,105
2016	30,497
Prior	84,595
Revolving Loans	43,871
Total Loans	761,735	505,859
Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	104,560
2019	66,015
2018	102,700
2017	101,674
2016	76,793
Prior	198,145
Revolving Loans	399,986
Total Loans	1,049,873	920,998
Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	103,964
2019	66,015
2018	102,700
2017	101,674
2016	76,793
Prior	198,145
Revolving Loans	2,389
Total Loans	651,680	751,019
Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	596
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	22,944
Total Loans	23,540	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	374,653
Total Loans	374,653	150,293
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	163,886
2019	165,334
2018	130,085
2017	80,269
2016	37,301
Prior	75,629
Revolving Loans	6,380
Total Loans	658,884	665,952
Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	10,115
2019	11,016
2018	6,517
2017	6,605
2016	2,562
Prior	2,198
Revolving Loans	36
Total Loans	39,049	41,079
Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	105,780
2019	108,195
2018	85,150
2017	43,291
2016	10,485
Prior	6,398
Revolving Loans	0
Total Loans	359,299	348,658
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	47,991
2019	46,123
2018	38,418
2017	30,373
2016	24,254
Prior	67,033
Revolving Loans	6,344
Total Loans	260,536	276,215
Performing | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	103,964
2019	65,835
2018	102,061
2017	101,581
2016	76,188
Prior	190,453
Revolving Loans	2,389
Total Loans	642,471
Performing | Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	596
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	22,944
Total Loans	23,540
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	374,653
Total Loans	374,653
Performing | Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	10,115
2019	11,016
2018	6,517
2017	6,594
2016	2,558
Prior	2,191
Revolving Loans	35
Total Loans	39,026
Performing | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	105,780
2019	108,049
2018	84,773
2017	42,883
2016	10,393
Prior	6,230
Revolving Loans	0
Total Loans	358,108
Performing | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	47,991
2019	46,114
2018	38,357
2017	30,295
2016	24,204
Prior	65,933
Revolving Loans	4,920
Total Loans	257,814
Non–performing | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	180
2018	639
2017	93
2016	605
Prior	7,692
Revolving Loans	0
Total Loans	9,209
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	0
2018	0
2017	11
2016	4
Prior	7
Revolving Loans	1
Total Loans	23
Non–performing | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	146
2018	377
2017	408
2016	92
Prior	168
Revolving Loans	0
Total Loans	1,191
Non–performing | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	9
2018	61
2017	78
2016	50
Prior	1,100
Revolving Loans	1,424
Total Loans	2,722
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	43,528
2019	65,996
2018	53,374
2017	50,523
2016	51,460
Prior	144,099
Revolving Loans	37,557
Total Loans	446,537	492,386
Pass | Commercial | Non–owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	97,251
2019	121,030
2018	77,110
2017	141,356
2016	105,581
Prior	224,430
Revolving Loans	167,632
Total Loans	934,390	957,990
Pass | Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	495
2019	0
2018	0
2017	1,660
2016	0
Prior	1,237
Revolving Loans	7,228
Total Loans	10,620	12,925
Pass | Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	30
2019	885
2018	267
2017	2,232
2016	777
Prior	12,224
Revolving Loans	9,165
Total Loans	25,580	35,815
Pass | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	339,106
2019	64,658
2018	65,712
2017	87,782
2016	27,728
Prior	75,580
Revolving Loans	30,909
Total Loans	691,475	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	0
2019	855
2018	4,934
2017	10,175
2016	4,532
Prior	12,614
Revolving Loans	0
Total Loans	33,110	8,328
Special Mention | Commercial | Non–owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,403
2019	1,247
2018	27,471
2017	2,211
2016	2,610
Prior	15,282
Revolving Loans	4,840
Total Loans	55,064	7,824
Special Mention | Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	212
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	358
Total Loans	570	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	276
Revolving Loans	0
Total Loans	276	0
Special Mention | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7,650
2019	1,852
2018	10,922
2017	9,880
2016	1,953
Prior	5,684
Revolving Loans	10,641
Total Loans	48,582	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	1,026
2019	1,231
2018	4,048
2017	2,832
2016	2,564
Prior	7,912
Revolving Loans	3,867
Total Loans	23,480	18,863
Substandard | Commercial | Non–owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	15,589
2018	304
2017	622
2016	6,802
Prior	4,828
Revolving Loans	1,572
Total Loans	29,717	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	529
Revolving Loans	0
Total Loans	529	139
Substandard | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,002
2019	6,181
2018	3,584
2017	1,443
2016	816
Prior	3,331
Revolving Loans	2,321
Total Loans	21,678	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