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Significant Accounting Policies - COVID-19 (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) customer	Dec. 31, 2020 USD ($)
COVID-19
Percentage of remaining loan maintains government guarantee	100.00%
PPP Loans
COVID-19
Customers with PPP loans processed | customer	7,348
PPP loans originated	$ 1,089,805
Customers with PPP loans outstanding | customer	1,620
PPP loans outstanding	$ 183,110
PPP loans outstanding, amortized cost	178,231	$ 446,400
Received	895,455
Applications in process	$ 21,013
CARES Act
COVID-19
Customers with PPP loans processed | customer	4,595
PPP loans originated	$ 765,212
Customers with PPP loans outstanding | customer	121
PPP loans outstanding	$ 17,364
PPP loans outstanding, amortized cost	17,325
Received	744,320
Applications in process	$ 10,796
Economic Aid Act
COVID-19
Customers with PPP loans processed | customer	2,753
PPP loans originated	$ 324,593
Customers with PPP loans outstanding | customer	1,499
PPP loans outstanding	$ 165,746
PPP loans outstanding, amortized cost	160,906
Received	151,135
Applications in process	$ 10,217

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-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 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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