Loans - Loan Modifications by Concession Type (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) loan	Mar. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 3,978	$ 2,471
Total number of loans (in loan) | loan	46	12
Pre-modification recorded investment	$ 4,040	$ 2,535
Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,365	716
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	23
Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,847	1,176
Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	743	579
Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 3,505	$ 2,252
Total number of loans (in loan) | loan	21	8
Pre-modification recorded investment	$ 3,517	$ 2,261
Commercial loan portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	971	497
Commercial loan portfolio | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0
Commercial loan portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,791	1,176
Commercial loan portfolio | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	743	579
Commercial loan portfolio | Commercial
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 2,229	$ 1,730
Total number of loans (in loan) | loan	18	5
Pre-modification recorded investment	$ 2,235	$ 1,739
Commercial loan portfolio | Commercial | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	903	50
Commercial loan portfolio | Commercial | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0
Commercial loan portfolio | Commercial | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,065	1,101
Commercial loan portfolio | Commercial | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	261	579
Commercial loan portfolio | Total commercial real estate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 1,276	$ 522
Total number of loans (in loan) | loan	3	3
Pre-modification recorded investment	$ 1,282	$ 522
Commercial loan portfolio | Total commercial real estate | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	68	447
Commercial loan portfolio | Total commercial real estate | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0
Commercial loan portfolio | Total commercial real estate | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	726	75
Commercial loan portfolio | Total commercial real estate | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	482	0
Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 473	$ 219
Total number of loans (in loan) | loan	25	4
Pre-modification recorded investment	$ 523	$ 274
Consumer loan portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	394	219
Consumer loan portfolio | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	23
Consumer loan portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	56	0
Consumer loan portfolio | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0
Consumer loan portfolio | Residential mortgage
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 138	$ 98
Total number of loans (in loan) | loan	4	1
Pre-modification recorded investment	$ 142	$ 98
Consumer loan portfolio | Residential mortgage | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	138	98
Consumer loan portfolio | Residential mortgage | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0
Consumer loan portfolio | Residential mortgage | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0
Consumer loan portfolio | Residential mortgage | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0
Consumer loan portfolio | Consumer installment
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 122	$ 10
Total number of loans (in loan) | loan	16	2
Pre-modification recorded investment	$ 128	$ 11
Consumer loan portfolio | Consumer installment | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	71	10
Consumer loan portfolio | Consumer installment | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	23
Consumer loan portfolio | Consumer installment | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	28	0
Consumer loan portfolio | Consumer installment | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0
Consumer loan portfolio | Home equity
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 213	$ 111
Total number of loans (in loan) | loan	5	1
Pre-modification recorded investment	$ 253	$ 165
Consumer loan portfolio | Home equity | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	185	111
Consumer loan portfolio | Home equity | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0
Consumer loan portfolio | Home equity | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	28	0
Consumer loan portfolio | Home equity | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0
Owner-occupied | Commercial loan portfolio | Commercial
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 1,208	$ 522
Total number of loans (in loan) | loan	2	3
Pre-modification recorded investment	$ 1,208	$ 522
Owner-occupied | Commercial loan portfolio | Commercial | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	447
Owner-occupied | Commercial loan portfolio | Commercial | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0
Owner-occupied | Commercial loan portfolio | Commercial | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	726	75
Owner-occupied | Commercial loan portfolio | Commercial | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	482	$ 0
Non-owner occupied | Commercial loan portfolio | Commercial
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 68
Total number of loans (in loan) | loan	1
Pre-modification recorded investment	$ 74
Non-owner occupied | Commercial loan portfolio | Commercial | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	68
Non-owner occupied | Commercial loan portfolio | Commercial | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0
Non-owner occupied | Commercial loan portfolio | Commercial | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0
Non-owner occupied | Commercial loan portfolio | Commercial | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 0