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	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	$ 4,789,068	$ 4,537,128		$ 4,454,620
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,779,365	1,665,748		1,431,668
Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	494,720	480,514		545,279
Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	353,072	325,399		240,324
Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,739,611	1,581,961		1,364,396
Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	36,260	123,712		617,006
Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,356	1,368		1,616
Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	384,684	358,426	$ 384,684	$ 254,331
Loans Excluding Acquired Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	4,669,317	4,410,077
Loans Excluding Acquired Impaired Loans | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,712,273	1,593,588
Loans Excluding Acquired Impaired Loans | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	447,373	431,113
Loans Excluding Acquired Impaired Loans | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	351,715	324,087
Loans Excluding Acquired Impaired Loans | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,735,819	1,577,947
Loans Excluding Acquired Impaired Loans | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	36,260	123,712
Loans Excluding Acquired Impaired Loans | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,193	1,204
Loans Excluding Acquired Impaired Loans | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	384,684	358,426
Loans Excluding Acquired Impaired Loans | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	4,230,770	3,911,651
Loans Excluding Acquired Impaired Loans | Pass | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,530,253	1,397,228
Loans Excluding Acquired Impaired Loans | Pass | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	423,884	406,948
Loans Excluding Acquired Impaired Loans | Pass | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	316,400	286,434
Loans Excluding Acquired Impaired Loans | Pass | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,541,963	1,341,826
Loans Excluding Acquired Impaired Loans | Pass | Paycheck Protection Program
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	36,260	123,712
Loans Excluding Acquired Impaired Loans | Pass | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,113	1,123
Loans Excluding Acquired Impaired Loans | Pass | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	380,897	354,380
Loans Excluding Acquired Impaired Loans | Watch
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	293,955	353,789
Loans Excluding Acquired Impaired Loans | Watch | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	107,164	123,248
Loans Excluding Acquired Impaired Loans | Watch | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	17,934	19,062
Loans Excluding Acquired Impaired Loans | Watch | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	29,774	31,768
Loans Excluding Acquired Impaired Loans | Watch | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	136,986	177,638
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	80	81
Loans Excluding Acquired Impaired Loans | Watch | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	2,017	1,992
Loans Excluding Acquired Impaired Loans | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	71,720	69,538
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	38,012	37,340
Loans Excluding Acquired Impaired Loans | Special Mention | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,624	3,118
Loans Excluding Acquired Impaired Loans | Special Mention | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	5,541	5,885
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	23,162	21,586
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	1,381	1,609
Loans Excluding Acquired Impaired Loans | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	72,812	75,002
Loans Excluding Acquired Impaired Loans | Substandard | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	36,844	35,772
Loans Excluding Acquired Impaired Loans | Substandard | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,931	1,985
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	33,708	36,897
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	0
Loans Excluding Acquired Impaired Loans | Substandard | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	329	348
Loans Excluding Acquired Impaired Loans | Doubtful
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	60	97
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	60	97
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