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, 2020	Mar. 31, 2019
Financing Receivable Impaired [Line Items]
Average Recorded Investment	$ 75,769	$ 37,056
Interest Income Recognized	993	462
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	18,728	7,345
Average Recorded Investment, With an allowance recorded	13,177	5,186
Interest Income Recognized, With no related allowance recorded	277	119
Interest Income Recognized, With an allowance recorded	136	48
Residential Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	1,221	1,541
Average Recorded Investment, With an allowance recorded	771	226
Interest Income Recognized, With no related allowance recorded		13
Interest Income Recognized, With an allowance recorded	14	2
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
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	14,368	11,381
Average Recorded Investment, With an allowance recorded	24,668	11,377
Interest Income Recognized, With no related allowance recorded	105	126
Interest Income Recognized, With an allowance recorded	$ 441	$ 154