Loans - Loan Modifications by Concession Type (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 1,968	$ 1,211	$ 5,946	$ 3,682
Total number of loans (in loan) | loan	35	23	81	35
Pre-modification recorded investment	$ 2,002	$ 1,258	$ 6,042	$ 3,793
Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,337	497	2,702	1,213
Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	84		107
Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	516	592	2,363	1,768
Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	31	122	774	701
Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 1,521	$ 738	$ 5,026	$ 2,990
Total number of loans (in loan) | loan	19	10	40	18
Pre-modification recorded investment	$ 1,544	$ 758	$ 5,061	$ 3,019
Commercial loan portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,110	285	2,081	782
Commercial loan portfolio | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Commercial loan portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	380	331	2,171	1,507
Commercial loan portfolio | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	31	122	774	701
Commercial loan portfolio | Commercial
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 958	$ 551	$ 3,187	$ 2,281
Total number of loans (in loan) | loan	13	7	31	12
Pre-modification recorded investment	$ 969	$ 564	$ 3,204	$ 2,303
Commercial loan portfolio | Commercial | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	740	285	1,643	335
Commercial loan portfolio | Commercial | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Commercial loan portfolio | Commercial | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	218	266	1,283	1,367
Commercial loan portfolio | Commercial | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0	261	579
Commercial loan portfolio | Total commercial real estate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 563	$ 187	$ 1,839	$ 709
Total number of loans (in loan) | loan	6	3	9	6
Pre-modification recorded investment	$ 575	$ 194	$ 1,857	$ 716
Commercial loan portfolio | Total commercial real estate | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	370	0	438	447
Commercial loan portfolio | Total commercial real estate | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Commercial loan portfolio | Total commercial real estate | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	162	65	888	140
Commercial loan portfolio | Total commercial real estate | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	31	122	513	122
Commercial loan portfolio | Real estate construction and land development
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 0		$ 0
Total number of loans (in loan) | loan	0		0
Pre-modification recorded investment	$ 0		$ 0
Commercial loan portfolio | Real estate construction and land development | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Commercial loan portfolio | Real estate construction and land development | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Commercial loan portfolio | Real estate construction and land development | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Commercial loan portfolio | Real estate construction and land development | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 447	$ 473	$ 920	$ 692
Total number of loans (in loan) | loan	16	13	41	17
Pre-modification recorded investment	$ 458	$ 500	$ 981	$ 774
Consumer loan portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	227	212	621	431
Consumer loan portfolio | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	84		107
Consumer loan portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	136	261	192	261
Consumer loan portfolio | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0	0	0
Consumer loan portfolio | Residential mortgage
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 210	$ 298	$ 348	$ 396
Total number of loans (in loan) | loan	3	5	7	6
Pre-modification recorded investment	$ 215	$ 316	$ 357	$ 414
Consumer loan portfolio | Residential mortgage | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	131	37	269	135
Consumer loan portfolio | Residential mortgage | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	40		40
Consumer loan portfolio | Residential mortgage | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	39	261	39	261
Consumer loan portfolio | Residential mortgage | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0	0	0
Consumer loan portfolio | Consumer installment
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 69	$ 22	$ 191	$ 32
Total number of loans (in loan) | loan	9	4	25	6
Pre-modification recorded investment	$ 72	$ 24	$ 200	$ 35
Consumer loan portfolio | Consumer installment | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	15	22	86	32
Consumer loan portfolio | Consumer installment | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	44		67
Consumer loan portfolio | Consumer installment | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	10	0	38	0
Consumer loan portfolio | Consumer installment | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0	0	0
Consumer loan portfolio | Home equity
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 168	$ 153	$ 381	$ 264
Total number of loans (in loan) | loan	4	4	9	5
Pre-modification recorded investment	$ 171	$ 160	$ 424	$ 325
Consumer loan portfolio | Home equity | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	81	153	266	264
Consumer loan portfolio | Home equity | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Consumer loan portfolio | Home equity | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	87	0	115	0
Consumer loan portfolio | Home equity | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0	0	0
Owner-occupied | Commercial loan portfolio | Commercial
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 563	$ 187	$ 1,771	$ 709
Total number of loans (in loan) | loan	6	3	8	6
Pre-modification recorded investment	$ 575	$ 194	$ 1,783	$ 716
Owner-occupied | Commercial loan portfolio | Commercial | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	370	0	370	447
Owner-occupied | Commercial loan portfolio | Commercial | Principal reduction
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0		0
Owner-occupied | Commercial loan portfolio | Commercial | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	162	65	888	140
Owner-occupied | Commercial loan portfolio | Commercial | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 31	$ 122	513	$ 122
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 reduction
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