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Allowance for Credit Losses - Reserve for Unfunded Commitments (Details) - Reserve for unfunded commitments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	$ 29,222	$ 23,204	$ 30,603	$ 600
Increase (decrease) in Provision	3,300	1,400	1,919	7,704
Reserve for unfunded commitments, ending balance	32,522	24,604	32,522	24,604
Commercial and Industrial
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	12,808	8,181	11,719
Increase (decrease) in Provision	446	1,212	1,535	4,003
Reserve for unfunded commitments, ending balance	13,254	9,393	13,254	9,393
Commercial real estate
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	978	1,168	1,328
Increase (decrease) in Provision	255	(57)	(95)	333
Reserve for unfunded commitments, ending balance	1,233	1,111	1,233	1,111
Construction
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	7,873	5,908	9,037
Increase (decrease) in Provision	902	(749)	(262)	1,040
Reserve for unfunded commitments, ending balance	8,775	5,159	8,775	5,159
Residential mortgage
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance		3	2
Increase (decrease) in Provision		1	(2)	(3)
Reserve for unfunded commitments, ending balance		4		4
Home equity
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	7,521	7,890	8,452
Increase (decrease) in Provision	1,669	996	738	2,299
Reserve for unfunded commitments, ending balance	9,190	8,886	9,190	8,886
Consumer
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	42	54	65	600
Increase (decrease) in Provision	28	(3)	5	32
Reserve for unfunded commitments, ending balance	$ 70	$ 51	$ 70	51
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance				16,300
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Commercial and Industrial
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance				5,390
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Commercial real estate
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance				778
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Construction
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance				4,119
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Residential mortgage
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance				7
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Home equity
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance				6,587
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Consumer
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance				$ (581)

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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82919202-210446

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