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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) number in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($) Loans	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) Loans	Jun. 30, 2015 USD ($) Loans	Dec. 31, 2015 USD ($)
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0	$ 0	$ 0	$ 0
Number of Loans | Loans	0			2
Outstanding Recorded Investment	$ 3,726,000	3,726,000	3,726,000	$ 3,726,000		$ 5,623,000
Reserves specific to modified loans	$ 3,000	$ 3,000	3,000	$ 3,000		$ 1,000
Troubled debt restructuring, write-down			0
Defaults on troubled debt restructurings	0	0		0	0
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans				2	2
Pre-Modification Outstanding Recorded Investment			45,000		$ 42,000
Principal Modification			0		0
Post Modification Outstanding Recorded Investment			45,000		42,000
Outstanding Recorded Investment	$ 44,000	$ 44,000	$ 44,000	$ 44,000	$ 38,000

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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-Topic 310
-SubTopic 10
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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=49124121&loc=SL6953676-111524

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-Publisher FASB
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Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

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