Loan and Lease Receivables - Summary of Balances for Each Respective Loan and Lease Category (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 4,374,517	$ 3,785,661	$ 3,831,090
Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	3,636,579	2,835,652
Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	216,818	258,668
Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	521,120	691,341
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,347,855	1,276,542	1,306,288
Commercial Real Estate | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	919,862	792,263
Commercial Real Estate | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	117,114	135,914
Commercial Real Estate | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	310,879	348,365
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	633,396	711,822	749,103
Residential Real Estate | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	458,364	483,072
Residential Real Estate | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	84,197	100,223
Residential Real Estate | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	90,835	128,527
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	239,034	278,657	280,999
Construction, Land Development, and Other Land | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	234,017	235,794
Construction, Land Development, and Other Land | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	4,804	5,373
Construction, Land Development, and Other Land | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	213	37,490
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,328,809	1,331,565	1,302,162
Commercial and Industrial | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,214,099	1,160,996
Commercial and Industrial | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	10,489	16,909
Commercial and Industrial | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	104,221	153,660
Paycheck Protection Program ("PPP")
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	622,191
Paycheck Protection Program ("PPP") | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	622,191
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	3,143	6,565	9,354
Installment and Other | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	2,346	5,372
Installment and Other | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	214	249
Installment and Other | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	583	944
Lease Financing Receivables
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	200,089	180,510	$ 183,184
Lease Financing Receivables | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	185,700	158,155
Lease Financing Receivables | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 14,389	$ 22,355