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Loans and Allowance for Credit Losses - Loans modified in troubled debt restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 loan	Sep. 30, 2020 loan	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract
Loans and Leases Receivable Disclosure [Line Items]
Number of loans - restructured accruing	1	1	5	7
Number of loans - restructured nonaccruing | contract			2	4
Number of TDR loans | contract			7	11
Restructured accruing			$ 10,195	$ 10,522
Restructured nonaccruing			6,342	8,850
Troubled debt restructured			16,537	19,372
Specific allowance			3,371	856
Restructured and subsequently defaulted			6,342	13,669
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Restructured accruing			1,069	1,297
Restructured nonaccruing			0	138
Troubled debt restructured			1,069	1,435
Specific allowance			146	227
Restructured and subsequently defaulted			0	138
Income producing - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Restructured accruing			9,126	9,188
Restructured nonaccruing			6,342	6,342
Troubled debt restructured			15,468	15,530
Specific allowance			3,225	629
Restructured and subsequently defaulted			6,342	11,161
Owner occupied - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Restructured accruing			0	37
Restructured nonaccruing			0	2,370
Troubled debt restructured			0	2,407
Specific allowance			0	0
Restructured and subsequently defaulted			0	2,370
Construction Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Restructured accruing			0	0
Restructured nonaccruing			0	0
Troubled debt restructured			0	0
Specific allowance			0	0
Restructured and subsequently defaulted			$ 0	$ 0

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Number of financing receivables outstanding that have been modified by troubled debt restructurings.

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings accruing.

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Amount of credit loss expense (reversal of expense) for financing receivable from change in methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

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