Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) loans	Sep. 30, 2017 USD ($) loans	Sep. 30, 2018 USD ($) loans	Sep. 30, 2017 USD ($) loans
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	30	27	90	97
Post-Modification Recorded Investment \| $	$ 2,512	$ 3,468	$ 15,049	$ 16,628
Extend maturity with rate concession \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	3	2	3	2
Post-Modification Recorded Investment \| $	$ 330	$ 468	$ 330	$ 468
Extend maturity without rate concession \| Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	2	1	7	9
Post-Modification Recorded Investment \| $	$ 913	$ 160	$ 2,064	$ 5,853
Extend maturity without rate concession \| Commercial - unsecured
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 0	$ 33
Extend maturity without rate concession \| Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	2	6	6
Post-Modification Recorded Investment \| $	$ 0	$ 1,247	$ 8,261	$ 2,228
Extend maturity without rate concession \| Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	23	14	63	47
Post-Modification Recorded Investment \| $	$ 985	$ 1,315	$ 3,607	$ 3,874
Extend maturity without rate concession \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	1	2	2	4
Post-Modification Recorded Investment \| $	$ 267	$ 151	$ 344	$ 488
Extend maturity without rate concession \| Construction
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 0	$ 1,204
Bankruptcy \| Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 0	$ 490
Bankruptcy \| Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 0	$ 12
Bankruptcy \| Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	1	6	8	23
Post-Modification Recorded Investment \| $	$ 17	$ 127	$ 438	$ 1,643
Bankruptcy \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	1	2
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 5	$ 335

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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.

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