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, 2020	Dec. 31, 2019
Financing Receivable Impaired [Line Items]
Recorded Investment	$ 81,437	$ 68,741
Unpaid Principal Balance	89,751	75,668
Related Allowance	13,435	10,690
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	20,229	16,556
Recorded Investment, With an allowance recorded	12,745	9,840
Unpaid Principal Balance, With no related allowance recorded	21,732	19,808
Unpaid Principal Balance, With an allowance recorded	13,725	10,691
Related Allowance	3,634	2,614
Residential Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded		2,165
Recorded Investment, With an allowance recorded	1,960	233
Unpaid Principal Balance, With no related allowance recorded		2,253
Unpaid Principal Balance, With an allowance recorded	2,041	233
Related Allowance	92	124
Construction, Land Development, and Other Land
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,577	2,644
Unpaid Principal Balance, With no related allowance recorded	2,952	3,000
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	11,872	19,211
Recorded Investment, With an allowance recorded	32,054	18,092
Unpaid Principal Balance, With no related allowance recorded	14,690	20,398
Unpaid Principal Balance, With an allowance recorded	34,611	19,285
Related Allowance	$ 9,709	$ 7,952