Loans - Loan Modifications by Concession Type (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 1,211	$ 6,093	$ 3,682	$ 11,116
Total number of loans (in loan) | loan	23	37	35	55
Pre-modification recorded investment	$ 1,258	$ 6,093	$ 3,793	$ 11,116
Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	497	4,172	1,213	9,158
Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	592	171	1,768	208
Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	122	1,750	701	1,750
Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 738	$ 5,603	$ 2,990	$ 10,422
Total number of loans (in loan) | loan	10	23	18	34
Pre-modification recorded investment	$ 758	$ 5,603	$ 3,019	$ 10,422
Commercial loan portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	285	3,853	782	8,672
Commercial loan portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	331	0	1,507	0
Commercial loan portfolio | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	122	1,750	701	1,750
Commercial loan portfolio | Commercial
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 551	$ 4,149	$ 2,281	$ 7,981
Total number of loans (in loan) | loan	7	21	12	28
Pre-modification recorded investment	$ 564	$ 4,149	$ 2,303	$ 7,981
Commercial loan portfolio | Commercial | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	285	2,399	335	6,231
Commercial loan portfolio | Commercial | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	266	0	1,367	0
Commercial loan portfolio | Commercial | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	1,750	579	1,750
Commercial loan portfolio | Commercial real estate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 187	$ 1,454	$ 709	$ 2,441
Total number of loans (in loan) | loan	3	2	6	6
Pre-modification recorded investment	$ 194	$ 1,454	$ 716	$ 2,441
Commercial loan portfolio | Commercial real estate | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	1,454	447	2,441
Commercial loan portfolio | Commercial real estate | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	65	0	140	0
Commercial loan portfolio | Commercial real estate | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	122	0	122	0
Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 473	$ 490	$ 692	$ 694
Total number of loans (in loan) | loan	13	14	17	21
Pre-modification recorded investment	$ 500	$ 490	$ 774	$ 694
Consumer loan portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	212	319	431	486
Consumer loan portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	261	171	261	208
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	$ 298	$ 174	$ 396	$ 279
Total number of loans (in loan) | loan	5	2	6	3
Pre-modification recorded investment	$ 316	$ 174	$ 414	$ 279
Consumer loan portfolio | Residential mortgage | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	37	174	135	279
Consumer loan portfolio | Residential mortgage | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	261	0	261	0
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	$ 22	$ 47	$ 32	$ 80
Total number of loans (in loan) | loan	4	8	6	12
Pre-modification recorded investment	$ 24	$ 47	$ 35	$ 80
Consumer loan portfolio | Consumer installment | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	22	47	32	80
Consumer loan portfolio | Consumer installment | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	0	0	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	$ 153	$ 269	$ 264	$ 335
Total number of loans (in loan) | loan	4	4	5	6
Pre-modification recorded investment	$ 160	$ 269	$ 325	$ 335
Consumer loan portfolio | Home equity | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	153	98	264	127
Consumer loan portfolio | Home equity | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	171	0	208
Consumer loan portfolio | Home equity | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 0	$ 0	$ 0	$ 0