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Loans and Allowance for Credit Losses on Loans - Schedule of Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans at amortized cost	$ 2,002,767		$ 2,088,556
Allowance for credit losses on loans	(19,100)	$ (19,958)	(22,874)
Loans, net of allowance for credit losses	1,983,667		2,065,682
Deferred loan fees	(5,200)		(4,900)
Unrecognized purchase discounts on non-PCI loans	737		815
Financing receivable, accrued interest, net	7,300		8,800
Commercial loans | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans at amortized cost	423,646		498,408
Allowance for credit losses on loans	(1,590)	(1,654)	(2,530)
Commercial real estate loans | Commercial owner-occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans at amortized cost	296,407		304,963
Allowance for credit losses on loans	(2,037)	(2,304)	(2,778)
Commercial real estate loans | Commercial investor-owned
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans at amortized cost	967,335		961,208
Allowance for credit losses on loans	(10,761)	(10,856)	(12,682)
Commercial real estate loans | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans at amortized cost	80,841		73,046
Allowance for credit losses on loans	(1,142)	(1,312)	(1,557)
Residential loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans at amortized cost	92,510		104,813
Allowance for credit losses on loans	(412)	(520)	(738)
Residential loans | Other residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans at amortized cost	120,903		123,395
Allowance for credit losses on loans	(613)	(757)	(998)
Consumer loans | Installment and other consumer loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans at amortized cost	21,125		22,723
Allowance for credit losses on loans	$ (238)	$ (255)	$ (291)

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Amount of unrecognized purchase discounts from face amounts of acquired loans without evidence of credit deterioration, net of unamortized purchase premiums.

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