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Loans and Allowance for Credit Losses - Additional Information II (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan contract	Dec. 31, 2018 USD ($) contract loan	Dec. 31, 2017 USD ($)
Financing receivable, modifications, recorded investment	$ 19,100	$ 24,600
Nonaccrual loans, gross interest income if in compliance	3,000	1,000
Nonaccrual loans, recorded interest income	$ 630	$ 265
Number of loans - restructured accruing | contract	7	9
Number of loans - restructured nonaccruing | contract	2	3
Number of loans | contract	9	12
Number of defaulted loans charged-off | loan		4
Recorded investment - defaulted charged-off	$ 2,300	$ 1,400
Number of loans pay-off | loan	1
Recorded investment - pay-offs	$ 309
Number of loans paydowns | loan		1
Recorded investment - loans modified in TDR	$ 2,300	$ 12,800
Number of loans modified in TDR | loan	1	2
Performing Loans
Financing receivable, modifications, recorded investment	$ 16,600	$ 24,000
Number of loans | loan	7	9
Number of loans pay-off | loan	2
Recorded investment - pay-offs	$ 3,900
Non-Performing Loans
Financing receivable, modifications, recorded investment	$ 9,500	$ 460
Number of loans subsequent defaults reclassified to non-performing | loan	3	2
Recorded investment - paydowns			$ 183
Paydown of nonperforming loan		$ 176
Third Loan
Financing receivable, modifications, recorded investment	$ 2,400

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-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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