Loans and Loans Held for Sale - Restructured Loans by Type of Concession (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		53	46
Pre-Modification Outstanding Recorded Investment	[1]	$ 32,446	$ 12,672
Restructured loans	[1]	32,206	11,384
Total Difference in Recorded Investment		$ (240)	$ (1,288)
Maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	3
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 1,024
Restructured loans	[1]	0	345
Total Difference in Recorded Investment		$ 0	$ (679)
Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	2
Pre-Modification Outstanding Recorded Investment	[1]	$ 4,902	$ 47
Restructured loans	[1]	4,280	46
Total Difference in Recorded Investment		$ (622)	$ (1)
Principal deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		4	5
Pre-Modification Outstanding Recorded Investment	[1]	$ 24,767	$ 4,905
Restructured loans	[1]	24,309	4,473
Total Difference in Recorded Investment		$ (458)	$ (432)
Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		7	6
Pre-Modification Outstanding Recorded Investment	[1]	$ 950	$ 5,355
Restructured loans	[1]	933	5,341
Total Difference in Recorded Investment		$ (17)	$ (14)
Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 190	$ 120
Restructured loans	[1]	188	120
Total Difference in Recorded Investment		$ (2)	$ 0
Below market interest rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 569	$ 0
Restructured loans	[1]	1,519	0
Total Difference in Recorded Investment		$ 950	$ 0
Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[2]	36	29
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 1,068	$ 1,221
Restructured loans	[1],[2]	977	1,059
Total Difference in Recorded Investment	[2]	$ (91)	$ (162)
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		7	2
Pre-Modification Outstanding Recorded Investment	[1]	$ 24,672	$ 346
Restructured loans	[1]	25,159	269
Total Difference in Recorded Investment		$ 486	$ (77)
Commercial real estate | Maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 256
Restructured loans	[1]	0	179
Total Difference in Recorded Investment		$ 0	$ (77)
Commercial real estate | Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 150	$ 0
Restructured loans	[1]	145	0
Total Difference in Recorded Investment		$ (6)	$ 0
Commercial real estate | Principal deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		3	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 23,517	$ 90
Restructured loans	[1]	23,059	90
Total Difference in Recorded Investment		$ (458)	$ 0
Commercial real estate | Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 436	$ 0
Restructured loans	[1]	436	0
Total Difference in Recorded Investment		$ 0	$ 0
Commercial real estate | Below market interest rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 569	$ 0
Restructured loans	[1]	1,519	0
Total Difference in Recorded Investment		$ 950	$ 0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		3	12
Pre-Modification Outstanding Recorded Investment	[1]	$ 6,294	$ 10,938
Restructured loans	[1]	5,661	9,890
Total Difference in Recorded Investment		$ (633)	$ (1,048)
Commercial and industrial | Maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	2
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 768
Restructured loans	[1]	0	166
Total Difference in Recorded Investment		$ 0	$ (602)
Commercial and industrial | Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 4,751	$ 0
Restructured loans	[1]	4,136	0
Total Difference in Recorded Investment		$ (616)	$ 0
Commercial and industrial | Principal deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1	4
Pre-Modification Outstanding Recorded Investment	[1]	$ 1,250	$ 4,815
Restructured loans	[1]	1,250	4,383
Total Difference in Recorded Investment		$ 0	$ (432)
Commercial and industrial | Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1	6
Pre-Modification Outstanding Recorded Investment	[1]	$ 292	$ 5,355
Restructured loans	[1]	275	5,341
Total Difference in Recorded Investment		$ (17)	$ (14)
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		6	5
Pre-Modification Outstanding Recorded Investment	[1]	$ 348	$ 387
Restructured loans	[1]	340	374
Total Difference in Recorded Investment		$ (9)	$ (13)
Residential mortgage | Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		3	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 183	$ 0
Restructured loans	[1]	183	0
Total Difference in Recorded Investment		$ 0	$ 0
Residential mortgage | Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[2]	3	5
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 165	$ 387
Restructured loans	[1],[2]	157	374
Total Difference in Recorded Investment	[2]	$ (9)	$ (13)
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		33	25
Pre-Modification Outstanding Recorded Investment	[1]	$ 1,116	$ 978
Restructured loans	[1]	1,037	847
Total Difference in Recorded Investment		$ (79)	$ (131)
Home equity | Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	2
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 47
Restructured loans	[1]	0	46
Total Difference in Recorded Investment		$ 0	$ (1)
Home equity | Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 39	$ 0
Restructured loans	[1]	39	0
Total Difference in Recorded Investment		$ 0	$ 0
Home equity | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 190	$ 120
Restructured loans	[1]	188	120
Total Difference in Recorded Investment		$ (2)	$ 0
Home equity | Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[2]	29	22
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 886	$ 811
Restructured loans	[1],[2]	810	681
Total Difference in Recorded Investment	[2]	$ (77)	$ (130)
Installment and other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[2]	4	2
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 16	$ 23
Restructured loans	[1],[2]	11	4
Total Difference in Recorded Investment	[2]	$ (5)	$ (19)

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