Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	$ 3,005,642	$ 2,784,562
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	2,045,199	1,785,243
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	24,354	35,533
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	59,369	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	2,128,922	1,860,667
Commercial, industrial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,263,521	1,046,665
Commercial, industrial and agricultural | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,226,388	1,004,445
Commercial, industrial and agricultural | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	10,889	16,696
Commercial, industrial and agricultural | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	26,244	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	865,401	814,002
Commercial mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	818,811	780,798
Commercial mortgages | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	13,465	18,837
Commercial mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	33,125	14,367
Commercial mortgages | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	$ 0	$ 0