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Loans and Allowance for Credit Losses - Loans modified in troubled debt restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 contract	Mar. 31, 2022 USD ($)	Mar. 31, 2022 loan	Mar. 31, 2021 contract	Mar. 31, 2021 USD ($)	Mar. 31, 2021 loan
Loans and Leases Receivable Disclosure [Line Items]
Number of loans - restructured accruing	5		1	5		1
Number of loans - restructured nonaccruing | contract	2			3
Number of TDR loans | contract	7			8
Restructured accruing		$ 10,121			$ 10,328
Restructured nonaccruing		6,342			6,443
Troubled debt restructured		16,463			16,771
Individually-evaluated allowance		2,455			3,523
Restructured and subsequently defaulted		6,342			6,443
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Restructured accruing		1,016			1,157
Restructured nonaccruing		0			101
Troubled debt restructured		1,016			1,258
Individually-evaluated allowance		170			547
Restructured and subsequently defaulted		0			101
Income-producing - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Restructured accruing		9,105			9,171
Restructured nonaccruing		6,342			6,342
Troubled debt restructured		15,447			15,513
Individually-evaluated allowance		2,285			2,976
Restructured and subsequently defaulted		$ 6,342			$ 6,342

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- Definition

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

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

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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.

+ References

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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