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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Risk Rating Categories of Loans and Leases Considered for Inclusion in Allowance for Loan and Lease Losses Calculation (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	$ 4,609,228	$ 4,340,535	$ 4,374,517
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,618,378	1,421,670	1,347,855
Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	507,754	572,271	633,396
Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	338,412	230,733	239,034
Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,536,405	1,368,900	1,328,809
Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	268,081	517,815	622,191
Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,442	2,005	3,143
Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	338,756	227,141	$ 200,089
Loans Excluding Acquired Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	4,453,948	4,138,718
Loans Excluding Acquired Impaired Loans | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,533,557	1,313,186
Loans Excluding Acquired Impaired Loans | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	445,861	493,431
Loans Excluding Acquired Impaired Loans | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	336,666	226,620
Loans Excluding Acquired Impaired Loans | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,529,754	1,358,722
Loans Excluding Acquired Impaired Loans | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	268,081	517,815
Loans Excluding Acquired Impaired Loans | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,273	1,803
Loans Excluding Acquired Impaired Loans | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	338,756	227,141
Loans Excluding Acquired Impaired Loans | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,878,401	3,477,922
Loans Excluding Acquired Impaired Loans | Pass | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,297,981	1,064,623
Loans Excluding Acquired Impaired Loans | Pass | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	422,843	463,103
Loans Excluding Acquired Impaired Loans | Pass | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	291,496	180,458
Loans Excluding Acquired Impaired Loans | Pass | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,261,335	1,027,399
Loans Excluding Acquired Impaired Loans | Pass | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	268,081	517,815
Loans Excluding Acquired Impaired Loans | Pass | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,190	1,706
Loans Excluding Acquired Impaired Loans | Pass | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	335,475	222,818
Loans Excluding Acquired Impaired Loans | Watch
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	394,339	428,702
Loans Excluding Acquired Impaired Loans | Watch | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	143,047	134,381
Loans Excluding Acquired Impaired Loans | Watch | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	16,862	22,086
Loans Excluding Acquired Impaired Loans | Watch | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	37,795	46,162
Loans Excluding Acquired Impaired Loans | Watch | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	196,288	225,930
Loans Excluding Acquired Impaired Loans | Watch | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Watch | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	83	96
Loans Excluding Acquired Impaired Loans | Watch | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	264	47
Loans Excluding Acquired Impaired Loans | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	91,791	123,322
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	48,605	60,022
Loans Excluding Acquired Impaired Loans | Special Mention | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,036	3,795
Loans Excluding Acquired Impaired Loans | Special Mention | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	7,375	0
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	30,841	56,784
Loans Excluding Acquired Impaired Loans | Special Mention | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Special Mention | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Special Mention | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,934	2,721
Loans Excluding Acquired Impaired Loans | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	89,120	108,172
Loans Excluding Acquired Impaired Loans | Substandard | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	43,924	54,160
Loans Excluding Acquired Impaired Loans | Substandard | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,120	4,447
Loans Excluding Acquired Impaired Loans | Substandard | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Substandard | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	41,290	48,609
Loans Excluding Acquired Impaired Loans | Substandard | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Substandard | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	1
Loans Excluding Acquired Impaired Loans | Substandard | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	786	955
Loans Excluding Acquired Impaired Loans | Doubtful
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	297	600
Loans Excluding Acquired Impaired Loans | Doubtful | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Doubtful | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Doubtful | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Doubtful | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Doubtful | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Doubtful | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Doubtful | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	297	600
Loans Excluding Acquired Impaired Loans | Loss
Financing Receivable Recorded Investment [Line Items]
Total loans and leases		0
Loans Excluding Acquired Impaired Loans | Loss | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Loss | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Loss | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Loss | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Loss | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	0	0
Loans Excluding Acquired Impaired Loans | Loss | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	$ 0	0
Loans Excluding Acquired Impaired Loans | Loss | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases		$ 0

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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