Loans - Loan Modifications by Concession Type (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) loan	Mar. 31, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 2,471	$ 5,023
Total number of loans | loan	12	18
Pre-modification recorded investment	$ 2,535	$ 5,023
Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	716	4,986
Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,176	37
Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	579	0
Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 2,252	$ 4,819
Total number of loans | loan	8	11
Pre-modification recorded investment	$ 2,261	$ 4,819
Commercial loan portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	497	4,819
Commercial loan portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,176	0
Commercial loan portfolio | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	579	0
Commercial loan portfolio | Commercial
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 1,730	$ 3,832
Total number of loans | loan	5	7
Pre-modification recorded investment	$ 1,739	$ 3,832
Commercial loan portfolio | Commercial | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	50	3,832
Commercial loan portfolio | Commercial | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	1,101	0
Commercial loan portfolio | Commercial | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	579	0
Commercial loan portfolio | Commercial real estate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 522	$ 987
Total number of loans | loan	3	4
Pre-modification recorded investment	$ 522	$ 987
Commercial loan portfolio | Commercial real estate | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	447	987
Commercial loan portfolio | Commercial real estate | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	75	0
Commercial loan portfolio | Commercial real estate | 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	$ 219	$ 204
Total number of loans | loan	4	7
Pre-modification recorded investment	$ 274	$ 204
Consumer loan portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	219	167
Consumer loan portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	37
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	$ 98	$ 105
Total number of loans | loan	1	1
Pre-modification recorded investment	$ 98	$ 105
Consumer loan portfolio | Residential mortgage | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	98	105
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	$ 10	$ 33
Total number of loans | loan	2	4
Pre-modification recorded investment	$ 11	$ 33
Consumer loan portfolio | Consumer installment | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	10	33
Consumer loan portfolio | Consumer installment | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	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	$ 111	$ 66
Total number of loans | loan	1	2
Pre-modification recorded investment	$ 165	$ 66
Consumer loan portfolio | Home equity | Principal deferral
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	111	29
Consumer loan portfolio | Home equity | Interest rate
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	0	37
Consumer loan portfolio | Home equity | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post-modification recorded investment	$ 0	$ 0