Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Average Recorded Investment and Interest Income Recognized for Loans and Leases Considered Impaired (Details) - Loans Excluding Acquired Impaired Loans - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable Impaired [Line Items]
Average Recorded Investment	$ 45,170	$ 33,782
Interest Income Recognized	2,457	977
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	9,379	9,441
Average Recorded Investment, With an allowance recorded	8,238	5,022
Interest Income Recognized, With no related allowance recorded	761	232
Interest Income Recognized, With an allowance recorded	479	16
Residential Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	1,914	1,910
Average Recorded Investment, With an allowance recorded	207	330
Interest Income Recognized, With no related allowance recorded	60	24
Interest Income Recognized, With an allowance recorded	7	3
Construction, Land Development, and Other Land
Financing Receivable Impaired [Line Items]
Interest Income Recognized, With no related allowance recorded		15
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	11,889	8,018
Average Recorded Investment, With an allowance recorded	13,543	9,047
Interest Income Recognized, With no related allowance recorded	482	194
Interest Income Recognized, With an allowance recorded	$ 668	484
Installment and Other
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With an allowance recorded		14
Interest Income Recognized, With an allowance recorded		$ 9