Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Recorded Investment, Unpaid Principal Balance, and Related Allowance for Loans and Leases Considered Impaired (Details) - Loans Excluding Acquired Impaired Loans - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Recorded Investment	$ 99,436	$ 95,355
Unpaid Principal Balance	108,559	103,564
Related Allowance	26,334	23,960
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	28,685	32,473
Recorded Investment, With an allowance recorded	25,736	13,696
Unpaid Principal Balance, With no related allowance recorded	30,853	34,792
Unpaid Principal Balance, With an allowance recorded	27,275	14,919
Related Allowance	7,409	5,034
Residential Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,496	1,558
Recorded Investment, With an allowance recorded	213	272
Unpaid Principal Balance, With no related allowance recorded	1,609	1,644
Unpaid Principal Balance, With an allowance recorded	215	274
Related Allowance	101	78
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	13,585	17,944
Recorded Investment, With an allowance recorded	29,721	29,412
Unpaid Principal Balance, With no related allowance recorded	16,218	19,917
Unpaid Principal Balance, With an allowance recorded	32,389	32,018
Related Allowance	$ 18,824	$ 18,848