Non-performing Loans and Impaired Loans - Loans by Credit Grades (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 3,707,299	$ 3,634,596
Percentage of total loans		100.00%
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	65,525
2019	288,749
2018	273,029
2017	339,203
2016	236,612
Prior	594,735
Revolving Loans	252,549
Total Loans	2,050,402	$ 2,047,646
Commercial | Owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	14,012
2019	65,768
2018	70,688
2017	65,370
2016	63,069
Prior	191,123
Revolving Loans	40,871
Total Loans	510,901	519,577
Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	27,392
2019	140,972
2018	116,193
2017	153,228
2016	131,442
Prior	266,140
Revolving Loans	157,228
Total Loans	992,595	973,331
Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	190
2018	0
2017	312
2016	957
Prior	2,093
Revolving Loans	8,116
Total Loans	11,668	12,925
Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	30
2019	932
2018	2,568
2017	4,496
2016	1,586
Prior	14,784
Revolving Loans	8,595
Total Loans	32,991	35,954
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	24,091
2019	80,887
2018	83,580
2017	115,797
2016	39,558
Prior	120,595
Revolving Loans	37,739
Total Loans	502,247	505,859
Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	29,138
2019	74,922
2018	139,475
2017	130,458
2016	97,866
Prior	261,184
Revolving Loans	248,005
Total Loans	981,048	920,998
Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	29,138
2019	74,584
2018	139,475
2017	130,458
2016	97,866
Prior	261,184
Revolving Loans	329
Total Loans	733,034	751,019
Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	338
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	24,157
Total Loans	24,495	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	223,519
Total Loans	223,519	150,293
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	55,597
2019	201,717
2018	164,091
2017	103,983
2016	48,340
Prior	96,654
Revolving Loans	5,467
Total Loans	675,849	665,952
Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,774
2019	13,707
2018	8,702
2017	8,268
2016	3,476
Prior	3,020
Revolving Loans	117
Total Loans	40,064	41,079
Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	42,135
2019	129,557
2018	106,640
2017	56,756
2016	14,815
Prior	10,390
Revolving Loans	0
Total Loans	360,293	348,658
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	10,688
2019	58,453
2018	48,749
2017	38,959
2016	30,049
Prior	83,244
Revolving Loans	5,350
Total Loans	275,492	276,215
Performing | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	29,138
2019	74,317
2018	139,327
2017	130,086
2016	96,489
Prior	254,575
Revolving Loans	329
Total Loans	724,261
Performing | Real estate | Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	338
2018	0
2017	0
2016	0
Prior	0
Revolving Loans	24,157
Total Loans	24,495
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	223,519
Total Loans	223,519
Performing | Consumer | Direct installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,774
2019	13,701
2018	8,699
2017	8,267
2016	3,476
Prior	3,014
Revolving Loans	115
Total Loans	40,046
Performing | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	42,135
2019	129,329
2018	106,358
2017	56,278
2016	14,661
Prior	10,168
Revolving Loans	0
Total Loans	358,929
Performing | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	10,688
2019	58,444
2018	48,683
2017	38,878
2016	30,030
Prior	82,155
Revolving Loans	4,322
Total Loans	273,200
Non-performing | Real estate | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	267
2018	148
2017	372
2016	1,377
Prior	6,609
Revolving Loans	0
Total Loans	8,773
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	6
2018	3
2017	1
2016	0
Prior	6
Revolving Loans	2
Total Loans	18
Non-performing | Consumer | Indirect installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	228
2018	282
2017	478
2016	154
Prior	222
Revolving Loans	0
Total Loans	1,364
Non-performing | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	9
2018	66
2017	81
2016	19
Prior	1,089
Revolving Loans	1,028
Total Loans	2,292
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	13,838
2019	63,995
2018	62,398
2017	60,650
2016	60,221
Prior	173,904
Revolving Loans	36,254
Total Loans	471,260	492,386
Pass | Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	25,445
2019	129,457
2018	86,194
2017	150,894
2016	130,686
Prior	249,361
Revolving Loans	156,142
Total Loans	928,179	957,990
Pass | Commercial | Residential spec homes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	190
2018	0
2017	312
2016	957
Prior	2,093
Revolving Loans	8,116
Total Loans	11,668	12,925
Pass | Commercial | Development & spec land
Financing Receivable, Credit Quality Indicator [Line Items]
2020	30
2019	932
2018	2,568
2017	4,496
2016	1,586
Prior	14,645
Revolving Loans	8,595
Total Loans	32,852	35,815
Pass | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23,969
2019	71,713
2018	70,277
2017	108,382
2016	36,067
Prior	102,731
Revolving Loans	34,331
Total Loans	447,470	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	174
2019	291
2018	5,276
2017	3,896
2016	2,348
Prior	9,114
Revolving Loans	0
Total Loans	21,099	8,328
Special Mention | Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,947
2019	11,515
2018	27,560
2017	2,220
2016	299
Prior	11,783
Revolving Loans	1,086
Total Loans	56,410	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	0
Total Loans	0	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	139
Revolving Loans	0
Total Loans	139	0
Special Mention | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	122
2019	3,563
2018	10,134
2017	3,857
2016	2,872
Prior	12,926
Revolving Loans	1,005
Total Loans	34,479	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	1,482
2018	3,014
2017	824
2016	500
Prior	8,105
Revolving Loans	4,617
Total Loans	18,542	18,863
Substandard | Commercial | Non-owner occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	2,439
2017	114
2016	457
Prior	4,996
Revolving Loans	0
Total Loans	8,006	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	0
2019	5,611
2018	3,169
2017	3,558
2016	619
Prior	4,938
Revolving Loans	2,403
Total Loans	20,298	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