Loans and Allowance for Credit Losses on Loans - Schedule of loan deferrals by loan category (Details) $ in Thousands	9 Months Ended
Sep. 30, 2021 USD ($) loan item	Dec. 31, 2020 USD ($)
Loans, net \| $	$ 2,789,179	$ 2,574,861
Number of remaining second deferments \| item	4
2nd Deferments
Number of unsecured second deferments	1
2nd Deferments \| Collateral Pledged
Loans, net \| $	$ 1,372
2nd Deferments \| Real Estate
Number of remaining second deferments	1
2nd Deferments \| Business Assets
Number of remaining second deferments	2

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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=121593590&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant