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, 2020	Sep. 30, 2019
Financing Receivable Impaired [Line Items]
Average Recorded Investment	$ 79,242	$ 45,170
Interest Income Recognized	3,291	2,457
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	22,511	9,379
Average Recorded Investment, With an allowance recorded	13,329	8,238
Interest Income Recognized, With no related allowance recorded	927	761
Interest Income Recognized, With an allowance recorded	526	479
Residential Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	1,615	1,914
Average Recorded Investment, With an allowance recorded	460	207
Interest Income Recognized, With no related allowance recorded	26	60
Interest Income Recognized, With an allowance recorded	21	7
Construction, Land Development, and Other Land
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	2,984
Interest Income Recognized, With no related allowance recorded	220
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	16,991	11,889
Average Recorded Investment, With an allowance recorded	21,352	13,543
Interest Income Recognized, With no related allowance recorded	493	482
Interest Income Recognized, With an allowance recorded	$ 1,078	$ 668