Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	$ 2,828,745	$ 2,784,562
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,849,262	1,785,243
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	35,832	35,533
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	52,036	39,891
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	0	0
Pass, Special Mention, Substandard, Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,937,130	1,860,667
Commercial, industrial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,090,915	1,046,665
Commercial, industrial and agricultural | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,049,414	1,004,445
Commercial, industrial and agricultural | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	13,444	16,696
Commercial, industrial and agricultural | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	28,057	25,524
Commercial, industrial and agricultural | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	0	0
Commercial mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	846,215	814,002
Commercial mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	799,848	780,798
Commercial mortgages | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	22,388	18,837
Commercial mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	23,979	14,367
Commercial mortgages | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	$ 0	$ 0