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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) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Recorded Investment		$ 95,355
Unpaid Principal Balance		103,564
Related Allowance		23,960
Loans Excluding Acquired Impaired Loans
Financing Receivable Impaired [Line Items]
Recorded Investment	$ 87,198
Unpaid Principal Balance	97,747
Related Allowance	24,562
Loans Excluding Acquired Impaired Loans | Commercial Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	20,432	32,473
Recorded Investment, With an allowance recorded	25,131	13,696
Unpaid Principal Balance, With no related allowance recorded	25,512	34,792
Unpaid Principal Balance, With an allowance recorded	26,569	14,919
Related Allowance	8,420	5,034
Loans Excluding Acquired Impaired Loans | Residential Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	3,850	1,558
Recorded Investment, With an allowance recorded	96	272
Unpaid Principal Balance, With no related allowance recorded	3,901	1,644
Unpaid Principal Balance, With an allowance recorded	152	274
Related Allowance	0	78
Loans Excluding Acquired Impaired Loans | Commercial and Industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	14,212	17,944
Recorded Investment, With an allowance recorded	23,477	29,412
Unpaid Principal Balance, With no related allowance recorded	15,999	19,917
Unpaid Principal Balance, With an allowance recorded	25,614	32,018
Related Allowance	$ 16,142	$ 18,848

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