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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Contractual Delinquency Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	$ 4,609,228	$ 4,340,535	$ 4,374,517
Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	1,618,378	1,421,670	1,347,855
Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	507,754	572,271	633,396
Construction, Land Development, and Other Land
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	338,412	230,733	239,034
Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	1,536,405	1,368,900	1,328,809
Paycheck Protection Program
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	268,081	517,815	622,191
Installment and Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	1,442	2,005	3,143
Lease Financing Receivables
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	338,756	227,141	$ 200,089
Acquired Non-Impaired and Originated Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	42,700	55,716
Non-accrual	34,465	41,103
Current	4,411,248	4,083,002
Total loans and leases	4,453,948	4,138,718
Acquired Non-Impaired and Originated Loans | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	6,117	8,753
Acquired Non-Impaired and Originated Loans | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,118	5,860
Acquired Non-Impaired and Originated Loans | Greater than 90 Days and Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	0
Acquired Non-Impaired and Originated Loans | Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	18,838	21,707
Non-accrual	17,082	15,969
Current	1,514,719	1,291,479
Total loans and leases	1,533,557	1,313,186
Acquired Non-Impaired and Originated Loans | Commercial Real Estate | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	330	1,544
Acquired Non-Impaired and Originated Loans | Commercial Real Estate | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,426	4,194
Acquired Non-Impaired and Originated Loans | Commercial Real Estate | Greater than 90 Days and Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	0
Acquired Non-Impaired and Originated Loans | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	3,214	3,615
Non-accrual	2,127	1,929
Current	442,647	489,816
Total loans and leases	445,861	493,431
Acquired Non-Impaired and Originated Loans | Residential Real Estate | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,087	1,686
Acquired Non-Impaired and Originated Loans | Residential Real Estate | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0
Acquired Non-Impaired and Originated Loans | Residential Real Estate | Greater than 90 Days and Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	0
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,035	0
Non-accrual	0	0
Current	334,631	226,620
Total loans and leases	336,666	226,620
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,035	0
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	0
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land | Greater than 90 Days and Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	0
Acquired Non-Impaired and Originated Loans | Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	16,519	27,747
Non-accrual	14,272	21,936
Current	1,513,235	1,330,975
Total loans and leases	1,529,754	1,358,722
Acquired Non-Impaired and Originated Loans | Commercial and Industrial | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,653	4,521
Acquired Non-Impaired and Originated Loans | Commercial and Industrial | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	594	1,290
Acquired Non-Impaired and Originated Loans | Commercial and Industrial | Greater than 90 Days and Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	0
Acquired Non-Impaired and Originated Loans | Paycheck Protection Program
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0
Non-accrual	0
Current	268,081	517,815
Total loans and leases	268,081	517,815
Acquired Non-Impaired and Originated Loans | Paycheck Protection Program | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0
Acquired Non-Impaired and Originated Loans | Paycheck Protection Program | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0
Acquired Non-Impaired and Originated Loans | Paycheck Protection Program | Greater than 90 Days and Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0
Acquired Non-Impaired and Originated Loans | Installment and Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	39	7
Non-accrual	0	1
Current	1,234	1,796
Total loans and leases	1,273	1,803
Acquired Non-Impaired and Originated Loans | Installment and Other | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	39	6
Acquired Non-Impaired and Originated Loans | Installment and Other | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	0
Acquired Non-Impaired and Originated Loans | Installment and Other | Greater than 90 Days and Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	0
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,055	2,640
Non-accrual	984	1,268
Current	336,701	224,501
Total loans and leases	338,756	227,141
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	973	996
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	98	376
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables | Greater than 90 Days and Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 0	$ 0

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