Loans and Loans Held for Sale - Restructured Loans By Segment and Type of Concession (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2020 USD ($) loan		Mar. 31, 2019 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		14	[1]	10
Pre-Modification Outstanding Recorded Investment	[2]	$ 8,297	[1]	$ 5,522
Post-Modification Outstanding Recorded Investment	[2]	8,297	[1]	5,499
Total Difference in Recorded Investment		$ 0	[1]	$ (23)
Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		6
Pre-Modification Outstanding Recorded Investment	[2]	$ 5,991
Post-Modification Outstanding Recorded Investment	[2]	5,991
Total Difference in Recorded Investment		$ 0
Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				1
Pre-Modification Outstanding Recorded Investment	[2]			$ 5,201
Post-Modification Outstanding Recorded Investment	[2]			5,201
Total Difference in Recorded Investment				$ 0
Maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1
Pre-Modification Outstanding Recorded Investment	[2]	$ 1,891
Post-Modification Outstanding Recorded Investment	[2]	1,891
Total Difference in Recorded Investment		$ 0
Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[3]	6		8
Pre-Modification Outstanding Recorded Investment	[2],[3]	$ 388		$ 240
Post-Modification Outstanding Recorded Investment	[2],[3]	388		217
Total Difference in Recorded Investment	[3]	$ 0		$ (23)
Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				1
Pre-Modification Outstanding Recorded Investment	[2]			$ 81
Post-Modification Outstanding Recorded Investment	[2]			81
Total Difference in Recorded Investment				$ 0
Maturity date extension and payment reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1
Pre-Modification Outstanding Recorded Investment	[2]	$ 27
Post-Modification Outstanding Recorded Investment	[2]	27
Total Difference in Recorded Investment		$ 0
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1
Pre-Modification Outstanding Recorded Investment	[2]	$ 2,210
Post-Modification Outstanding Recorded Investment	[2]	2,210
Total Difference in Recorded Investment		$ 0
Commercial real estate | Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1
Pre-Modification Outstanding Recorded Investment	[2]	$ 2,210
Post-Modification Outstanding Recorded Investment	[2]	2,210
Total Difference in Recorded Investment		$ 0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		5		1
Pre-Modification Outstanding Recorded Investment	[2]	$ 3,780		$ 5,201
Post-Modification Outstanding Recorded Investment	[2]	3,780		5,201
Total Difference in Recorded Investment		$ 0		$ 0
Commercial and industrial | Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		5		0
Pre-Modification Outstanding Recorded Investment	[2]	$ 3,780		$ 0
Post-Modification Outstanding Recorded Investment	[2]	3,780		0
Total Difference in Recorded Investment		$ 0		$ 0
Commercial and industrial | Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				1
Pre-Modification Outstanding Recorded Investment	[2]			$ 5,201
Post-Modification Outstanding Recorded Investment	[2]			5,201
Total Difference in Recorded Investment				$ 0
Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1
Pre-Modification Outstanding Recorded Investment	[2]	$ 1,891
Post-Modification Outstanding Recorded Investment	[2]	1,891
Total Difference in Recorded Investment		$ 0
Commercial construction | Maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1
Pre-Modification Outstanding Recorded Investment	[2]	$ 1,891
Post-Modification Outstanding Recorded Investment	[2]	1,891
Total Difference in Recorded Investment		$ 0
Consumer real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		7
Pre-Modification Outstanding Recorded Investment	[2]	$ 415
Post-Modification Outstanding Recorded Investment	[2]	415
Total Difference in Recorded Investment		$ 0
Consumer real estate | Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[3]	6
Pre-Modification Outstanding Recorded Investment	[2],[3]	$ 388
Post-Modification Outstanding Recorded Investment	[2],[3]	388
Total Difference in Recorded Investment	[3]	$ 0
Consumer real estate | Maturity date extension and payment reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1
Pre-Modification Outstanding Recorded Investment	[2]	$ 27
Post-Modification Outstanding Recorded Investment	[2]	27
Total Difference in Recorded Investment		$ 0
Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				1
Pre-Modification Outstanding Recorded Investment	[2]			$ 49
Post-Modification Outstanding Recorded Investment	[2]			49
Total Difference in Recorded Investment				$ 0
Residential Mortgage | Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[3]			1
Pre-Modification Outstanding Recorded Investment	[2],[3]			$ 49
Post-Modification Outstanding Recorded Investment	[2],[3]			49
Total Difference in Recorded Investment	[3]			$ 0
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				8
Pre-Modification Outstanding Recorded Investment	[2]			$ 272
Post-Modification Outstanding Recorded Investment	[2]			249
Total Difference in Recorded Investment				$ (23)
Home equity | Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[3]			7
Pre-Modification Outstanding Recorded Investment	[2],[3]			$ 191
Post-Modification Outstanding Recorded Investment	[2],[3]			168
Total Difference in Recorded Investment	[3]			$ (23)
Home equity | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				1
Pre-Modification Outstanding Recorded Investment	[2]			$ 81
Post-Modification Outstanding Recorded Investment	[2]			81
Total Difference in Recorded Investment				$ 0
Home equity | Maturity date extension and payment reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				0
Pre-Modification Outstanding Recorded Investment	[2]			$ 0
Post-Modification Outstanding Recorded Investment	[2]			0
Total Difference in Recorded Investment				$ 0

[1] Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instrument.

[2] 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.

[3] Consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.