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Loan and Lease Receivables - Schedule of Unpaid Principal Balance and Carrying Value for Acquired Non-impaired Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Loans And Leases Receivables, Gross	$ 4,789,068	$ 4,537,128		$ 4,454,620
Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	281,841	322,680
Loans And Leases Receivables, Gross	275,483	315,751
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans And Leases Receivables, Gross	1,779,365	1,665,748		1,431,668
Commercial Real Estate | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	188,627	219,277
Loans And Leases Receivables, Gross	184,353	214,588
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans And Leases Receivables, Gross	494,720	480,514		545,279
Residential Real Estate | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	48,211	51,839
Loans And Leases Receivables, Gross	47,735	51,317
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Loans And Leases Receivables, Gross	353,072	325,399		240,324
Construction, Land Development, and Other Land | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	260	265
Loans And Leases Receivables, Gross	196	201
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans And Leases Receivables, Gross	1,739,611	1,581,961		1,364,396
Commercial and Industrial | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	39,314	44,827
Loans And Leases Receivables, Gross	37,794	43,202
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Loans And Leases Receivables, Gross	1,356	1,368		1,616
Installment and Other | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	257	273
Loans And Leases Receivables, Gross	248	264
Lease Financing Receivables
Accounts Notes And Loans Receivable [Line Items]
Loans And Leases Receivables, Gross	384,684	358,426	$ 384,684	$ 254,331
Lease Financing Receivables | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	5,172	6,199
Loans And Leases Receivables, Gross	$ 5,157	$ 6,179	$ 5,157

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Loans and leases receivable unpaid principal balance.

+ References

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ 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=124259787&loc=d3e4428-111522

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