Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) loans	Mar. 31, 2017 USD ($) loans
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	29	31
Post-Modification Recorded Investment \| $	$ 10,748	$ 5,696
Extend maturity without rate concession \| Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	9	4
Post-Modification Recorded Investment \| $	$ 9,359	$ 3,126
Extend maturity without rate concession \| Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 318
Extend maturity without rate concession \| Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	17	16
Post-Modification Recorded Investment \| $	$ 1,276	$ 1,284
Extend maturity without rate concession \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	2
Post-Modification Recorded Investment \| $	$ 0	$ 337
Bankruptcy \| Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	2	7
Post-Modification Recorded Investment \| $	$ 108	$ 453
Bankruptcy \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	1	1
Post-Modification Recorded Investment \| $	$ 5	$ 178

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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=84173941&loc=SL6953676-111524

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

+ References

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