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Loan and Lease Receivables - Summary of Outstanding Balance and Carrying Amount of All Acquired Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Acquired Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	$ 257,580	$ 309,838
Carrying Value	155,280	201,817
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	126,738	154,233
Carrying Value	84,821	108,484
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	108,560	126,086
Carrying Value	61,893	78,840
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	9,301	12,677
Carrying Value	1,746	4,113
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	12,115	15,925
Carrying Value	6,651	10,178
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	866	917
Carrying Value	$ 169	$ 202

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538

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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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-Topic 310
-SubTopic 30
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