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	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable Impaired [Line Items]
Average Recorded Investment	$ 108,174	$ 75,769
Interest Income Recognized	894	993
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	34,961	18,728
Average Recorded Investment, With an allowance recorded	22,178	13,177
Interest Income Recognized, With no related allowance recorded	311	277
Interest Income Recognized, With an allowance recorded	161	136
Residential Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	3,080	1,221
Average Recorded Investment, With an allowance recorded	298	771
Interest Income Recognized, With no related allowance recorded	18
Interest Income Recognized, With an allowance recorded	2	14
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	16,568	14,368
Average Recorded Investment, With an allowance recorded	31,089	24,668
Interest Income Recognized, With no related allowance recorded	129	105
Interest Income Recognized, With an allowance recorded	$ 273	441
Construction, Land Development, and Other Land
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded		2,836
Interest Income Recognized, With no related allowance recorded		$ 20