Loans and Loans Held for Sale - Restructured Loans During Periods Presented (Details) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2017 USD ($) contract	Jun. 30, 2016 USD ($) contract		Jun. 30, 2017 USD ($) contract		Jun. 30, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		11	22		18		38
Pre-Modification Outstanding Recorded Investment	[1]	$ 2,670	$ 10,707		$ 3,112		$ 13,353
Post-Modification Outstanding Recorded Investment	[1]	2,665	8,193		3,103		10,771
Total Difference in Recorded Investment		$ (5)	$ (2,514)		$ (9)		$ (2,582)
Principal deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		2	7		2		8
Pre-Modification Outstanding Recorded Investment	[1]	$ 529	$ 8,979		$ 529		$ 9,026
Post-Modification Outstanding Recorded Investment	[1]	529	6,528		529		6,574
Total Difference in Recorded Investment		$ 0	$ (2,451)		$ 0		$ (2,452)
Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		6	7	[2]	12	[2]	16	[2]
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 110	$ 154		$ 379		$ 1,328
Post-Modification Outstanding Recorded Investment	[1],[2]	105	146		371		1,283
Total Difference in Recorded Investment	[2]	$ (5)	$ (8)		$ (8)		$ (45)
Maturity date extension and interest rate reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		2	0		3		1
Pre-Modification Outstanding Recorded Investment	[1]	$ 1,800	$ 0		$ 1,973		$ 130
Post-Modification Outstanding Recorded Investment	[1]	1,800	0		1,972		128
Total Difference in Recorded Investment		$ 0	$ 0		$ (1)		$ (2)
Maturity date extension
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		1	8		1		13
Pre-Modification Outstanding Recorded Investment	[1]	$ 231	$ 1,574		$ 231		$ 2,869
Post-Modification Outstanding Recorded Investment	[1]	231	1,519		231		2,786
Total Difference in Recorded Investment		$ 0	$ (55)		$ 0		$ (83)
Commercial Real Estate | Principal deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		1	1		1		1
Pre-Modification Outstanding Recorded Investment	[1]	$ 100	$ 4,721		$ 100		$ 4,721
Post-Modification Outstanding Recorded Investment	[1]	100	2,270		$ 100		2,270
Total Difference in Recorded Investment		$ 0	$ (2,451)				$ (2,451)
Commercial Real Estate | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	[2]				0		1
Pre-Modification Outstanding Recorded Investment	[1],[2]				$ 0		$ 709
Post-Modification Outstanding Recorded Investment	[1],[2]				$ 0		681
Total Difference in Recorded Investment	[2]						$ (28)
Commercial and Industrial | Principal deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		1	5		1		5
Pre-Modification Outstanding Recorded Investment	[1]	$ 429	$ 985		$ 429		$ 985
Post-Modification Outstanding Recorded Investment	[1]	429	985		429		$ 985
Total Difference in Recorded Investment		$ 0	$ 0		$ 0
Commercial and Industrial | Maturity date extension and interest rate reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		2	0		2		0
Pre-Modification Outstanding Recorded Investment	[1]	$ 1,800	$ 0		$ 1,800		$ 0
Post-Modification Outstanding Recorded Investment	[1]	1,800	0		1,800		$ 0
Total Difference in Recorded Investment		$ 0	$ 0		$ 0
Commercial and Industrial | Maturity date extension
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		0	1		0		3
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 130		$ 0		$ 755
Post-Modification Outstanding Recorded Investment	[1]	0	130		0		728
Total Difference in Recorded Investment		$ 0	$ 0		$ 0		$ (27)
Commercial Construction | Maturity date extension
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		0	4		0		5
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 1,324		$ 0		$ 1,357
Post-Modification Outstanding Recorded Investment	[1]	0	1,269		$ 0		1,303
Total Difference in Recorded Investment		$ 0	$ (55)				$ (54)
Residential Mortgage | Principal deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		0	1		0		1
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 3,273		$ 0		$ 3,273
Post-Modification Outstanding Recorded Investment	[1]	0	3,273		0		3,273
Total Difference in Recorded Investment		$ 0	$ 0		$ 0		$ 0
Residential Mortgage | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		1	1	[2]	1	[2]	4	[2]
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 33	$ 65		$ 33		$ 285
Post-Modification Outstanding Recorded Investment	[1],[2]	33	64		33		280
Total Difference in Recorded Investment	[2]	$ 0	$ (1)				$ (5)
Residential Mortgage | Maturity date extension
Financing Receivable, Modifications [Line Items]
Number of Loans | contract							1
Pre-Modification Outstanding Recorded Investment	[1]						$ 483
Post-Modification Outstanding Recorded Investment	[1]						483
Total Difference in Recorded Investment					$ 0		$ 0
Home Equity Loan | Principal deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | contract					0		1
Pre-Modification Outstanding Recorded Investment	[1]				$ 0		$ 47
Post-Modification Outstanding Recorded Investment	[1]				0		46
Total Difference in Recorded Investment					$ 0		$ (1)
Home Equity Loan | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		3	4	[2]	9	[2]	9	[2]
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 40	$ 73		$ 309		$ 318
Post-Modification Outstanding Recorded Investment	[1],[2]	38	69		304		309
Total Difference in Recorded Investment	[2]	$ (2)	$ (4)		$ (5)		$ (9)
Home Equity Loan | Maturity date extension and interest rate reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | contract					1		1
Pre-Modification Outstanding Recorded Investment	[1]				$ 173		$ 130
Post-Modification Outstanding Recorded Investment	[1]				172		128
Total Difference in Recorded Investment					$ (1)		$ (2)
Home Equity Loan | Maturity date extension
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		1	3		1		4
Pre-Modification Outstanding Recorded Investment	[1]	$ 231	$ 120		$ 231		$ 274
Post-Modification Outstanding Recorded Investment	[1]	231	120		$ 231		272
Total Difference in Recorded Investment		$ 0	$ 0				$ (2)
Installment and Other Consumer | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		2	2	[2]	2	[2]	2	[2]
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 37	$ 16		$ 37		$ 16
Post-Modification Outstanding Recorded Investment	[1],[2]	34	13		34		13
Total Difference in Recorded Investment	[2]	$ (3)	$ (3)		$ (3)		$ (3)

[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

[2] Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.