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Loans and Allowance for Credit Losses - Schedule of Loans by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2021		Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	$ 2,255,645			$ 2,088,556
Allowance for credit losses on loans	(23,023)	[1]	$ (22,113)	(22,874)	[1]
Loans, net of allowance for credit losses	2,232,622			2,065,682
Deferred loan fees	(901)			(4,100)
Unrecognized purchase discounts on non-PCI loans	2,500			815
Financing receivable, accrued interest, net	7,100			8,800
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	301,602			498,408
Allowance for credit losses on loans	(1,709)		(2,525)	(2,530)
Commercial real estate | Commercial real estate, owner-occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	392,345			304,963
Allowance for credit losses on loans	(2,776)		(3,135)	(2,778)
Commercial real estate | Commercial real estate, investor-owned
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	1,189,021			961,208
Allowance for credit losses on loans	(12,739)		(11,624)	(12,682)
Commercial real estate | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	119,840			73,046
Allowance for credit losses on loans	(1,653)		(860)	(1,557)
Residential loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	88,746			104,813
Allowance for credit losses on loans	(595)		(1,038)	(738)
Residential loans | Other residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	114,558			123,395
Allowance for credit losses on loans	(644)		(1,260)	(998)
Consumer loans | Installment and other consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	49,533			22,723
Allowance for credit losses on loans	$ (621)		$ (406)	$ (291)
[1] Refer to Note 1, Summary of Accounting Policies, for information on the adoption of ASU 2016-13 in 2020.

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