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Loans and Allowance for Credit Losses - Loans modified in troubled debt restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Number of loans - restructured accruing | contract	7	9
Number of loans - restructured nonaccruing | contract	2	3
Number of loans | contract	9	12
Restructured accruing	$ 16,578	$ 24,025
Restructured nonaccruing	2,512	544
Troubled Debt Restructured	19,090	24,569
Specific allowance	1,000	3,000
Restructured and subsequently defaulted	9,485	1,345
Commercial
Restructured accruing	885	1,026
Restructured nonaccruing	142	544
Troubled Debt Restructured	1,027	1,570
Restructured and subsequently defaulted		408
Income Producing - Commercial Real Estate
Restructured accruing	14,806	19,636
Troubled Debt Restructured	14,806	19,636
Specific allowance	1,000	3,000
Restructured and subsequently defaulted	7,115	937
Owner Occupied - Commercial Real Estate
Restructured accruing	887	3,363
Restructured nonaccruing	2,370
Troubled Debt Restructured	3,257	$ 3,363
Restructured and subsequently defaulted	$ 2,370

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- Definition

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

+ References

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- Definition

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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- Definition

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

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

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- Definition

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=119407570&loc=SL82919244-210447

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- Definition

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=118936363&loc=SL6953676-111524

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- Definition

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=118936363&loc=SL6953682-111524

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