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Loans and Allowance for Credit Losses - Purchased credit-impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loans
Total Recorded Investment	$ 6,137	$ 5,269
Related Allowance	219	307
Contractually required payments receivable on PCI loans at acquisition:	6,588	5,717
Cash flows expected to be collected at acquisition	3,293	3,715
Purchased Credit Impaired Loans
Loans
Total Recorded Investment	470	612
Related Allowance	0	0
Contractually required payments receivable on PCI loans at acquisition:	0	982
Fair value of acquired loans at acquisition	0	631
Commercial | Purchased Credit Impaired Loans
Loans
Total Recorded Investment	470	612
Contractually required payments receivable on PCI loans at acquisition:	0	982
Cash flows expected to be collected at acquisition	$ 0	$ 693

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The amount of any significant purchases of financing receivables during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
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-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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