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Allowance for Loan Losses - Allowance for Loan Loss Activity by Class (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 11,232	$ 10,729	$ 10,729
Charge offs	151	318	1,273
Recoveries	34	46	276
Provision for loan losses	375	500	1,500
Ending balance	11,490	10,957	11,232
Ending balance specifically evaluated for impairment	2,075	2,206	2,308
Ending balance collectively evaluated for impairment	9,415	8,751	8,924
Total	1,264,639	1,188,002	1,238,283
Ending balance specifically evaluated for impairment	30,568	31,715	31,751
Ending balance collectively evaluated for impairment	1,234,071	1,156,287	1,206,532
Commercial | Real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,567	3,872	3,872
Charge offs	0	0	168
Recoveries	8	0	52
Provision for loan losses	57	(140)	(189)
Ending balance	3,632	3,732	3,567
Ending balance specifically evaluated for impairment	233	254	260
Ending balance collectively evaluated for impairment	3,399	3,478	3,307
Total	357,760	339,306	353,243
Ending balance specifically evaluated for impairment	9,957	8,951	9,760
Ending balance collectively evaluated for impairment	347,803	330,355	343,483
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	255	434	434
Charge offs	0	0	0
Recoveries	0	0	0
Provision for loan losses	70	(38)	(179)
Ending balance	325	396	255
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	325	396	255
Total	34,231	43,813	27,304
Ending balance specifically evaluated for impairment	1,007	741	721
Ending balance collectively evaluated for impairment	33,224	43,072	26,583
Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,541	3,358	3,358
Charge offs	1	17	423
Recoveries	1	6	40
Provision for loan losses	(111)	193	566
Ending balance	3,430	3,540	3,541
Ending balance specifically evaluated for impairment	1,485	1,664	1,696
Ending balance collectively evaluated for impairment	1,945	1,876	1,845
Total	205,462	177,783	196,391
Ending balance specifically evaluated for impairment	7,653	9,440	9,259
Ending balance collectively evaluated for impairment	197,809	168,343	187,132
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	24	20	20
Charge offs	0	0	0
Recoveries	0	0	0
Provision for loan losses	1	1	4
Ending balance	25	21	24
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	25	21	24
Total	54,246	35,463	51,128
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	54,246	35,463	51,128
Residential | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	34	36	36
Charge offs	0	0	0
Recoveries	0	0	0
Provision for loan losses	(4)	(5)	(2)
Ending balance	30	31	34
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	30	31	34
Total	18,450	15,847	17,743
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	18,450	15,847	17,743
Residential | Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,235	1,130	1,130
Charge offs	49	81	213
Recoveries	3	4	64
Provision for loan losses	(75)	76	254
Ending balance	1,114	1,129	1,235
Ending balance specifically evaluated for impairment	348	272	335
Ending balance collectively evaluated for impairment	766	857	900
Total	474,241	439,984	469,145
Ending balance specifically evaluated for impairment	10,919	11,528	10,904
Ending balance collectively evaluated for impairment	463,322	428,456	458,241
Home equity line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	730	692	692
Charge offs	38	115	121
Recoveries	1	11	24
Provision for loan losses	(63)	128	135
Ending balance	630	716	730
Ending balance specifically evaluated for impairment	7	16	17
Ending balance collectively evaluated for impairment	623	700	713
Total	95,692	110,298	98,469
Ending balance specifically evaluated for impairment	1,030	1,039	1,092
Ending balance collectively evaluated for impairment	94,662	109,259	97,377
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	630	545	545
Charge offs	63	105	348
Recoveries	21	25	96
Provision for loan losses	72	116	337
Ending balance	660	581	630
Ending balance specifically evaluated for impairment	2	0	0
Ending balance collectively evaluated for impairment	658	581	630
Total	24,557	25,508	24,860
Ending balance specifically evaluated for impairment	2	16	15
Ending balance collectively evaluated for impairment	24,555	25,492	24,845
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,216	642	642
Charge offs	0	0	0
Recoveries	0	0	0
Provision for loan losses	428	169	574
Ending balance	1,644	811	1,216
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	1,644	811	1,216
Total	0	0	0
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	$ 0	$ 0	$ 0

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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