Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	$ 2,600,921	$ 2,454,853
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	1,682,520	1,575,166
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	32,104	13,720
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	29,339	25,187
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	1,743,963	1,614,073
Commercial, industrial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	993,629	916,297
Commercial, industrial, and agricultural | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	952,065	890,360
Commercial, industrial, and agricultural | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	23,169	10,484
Commercial, industrial, and agricultural | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	18,395	15,453
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	750,334	697,776
Commercial mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	730,455	684,806
Commercial mortgages | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	8,935	3,236
Commercial mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	10,944	9,734
Commercial mortgages | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans	$ 0	$ 0