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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, 2021	Sep. 30, 2020
Financing Receivable Impaired [Line Items]
Average Recorded Investment	$ 104,548	$ 79,242
Interest Income Recognized	4,363	3,291
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	28,480	22,511
Average Recorded Investment, With an allowance recorded	27,620	13,329
Interest Income Recognized, With no related allowance recorded	920	927
Interest Income Recognized, With an allowance recorded	1,185	526
Residential Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	2,788	1,615
Average Recorded Investment, With an allowance recorded	207	460
Interest Income Recognized, With no related allowance recorded	109	26
Interest Income Recognized, With an allowance recorded	2	21
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	16,668	16,991
Average Recorded Investment, With an allowance recorded	28,785	21,352
Interest Income Recognized, With no related allowance recorded	481	493
Interest Income Recognized, With an allowance recorded	$ 1,666	1,078
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

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