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Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Allowance for loan losses:
Beginning balance	$ 15,835	$ 15,813	$ 15,821	$ 15,767
Provision for loan losses	400	0	400	0
Charge-offs	0	0	(9)	(5)
Recoveries	5	4	28	55
Ending balance	16,240	15,817	16,240	15,817
Ending ALLL related to loans collectively evaluated for impairment	15,851		15,851		$ 15,043
Ending ALLL related to loans individually evaluated for impairment	389		389		778
Ending ALLL	16,240		16,240		15,821
Collectively evaluated for impairment	1,784,280		1,784,280		1,746,714
Individually evaluated for impairment	12,351		12,351		15,038
Total loans	$ 1,798,690		$ 1,798,690		$ 1,763,864
Ratio of allowance for loan losses to total loans	0.90%		0.90%		0.90%
Allowance for loan losses to non-accrual loans	3848.00%		3848.00%		2270.00%
Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	$ 0		$ 0		$ 0
Purchased credit-impaired	2,059		2,059		2,112
Commercial loans | Commercial and industrial
Allowance for loan losses:
Beginning balance	2,368	2,597	2,436	3,654
Provision for loan losses	326	(245)	256	(1,308)
Charge-offs	0	0	(9)	(3)
Recoveries	5	4	16	13
Ending balance	2,699	2,356	2,699	2,356
Ending ALLL related to loans collectively evaluated for impairment	2,516		2,516		1,970
Ending ALLL related to loans individually evaluated for impairment	183		183		466
Ending ALLL	2,699		2,699		2,436
Collectively evaluated for impairment	259,664		259,664		228,883
Individually evaluated for impairment	1,160		1,160		1,825
Total loans	$ 260,828		$ 260,828		$ 230,739
Ratio of allowance for loan losses to total loans	1.03%		1.03%		1.06%
Allowance for loan losses to non-accrual loans	1384.00%		1384.00%		764.00%
Commercial loans | Commercial and industrial | Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	$ 0		$ 0		$ 0
Purchased credit-impaired	4		4		31
Commercial real estate loans | Commercial real estate, owner-occupied
Allowance for loan losses:
Beginning balance	2,321	2,339	2,407	2,294
Provision for loan losses	21	83	(65)	128
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	2,342	2,422	2,342	2,422
Ending ALLL related to loans collectively evaluated for impairment	2,257		2,257		2,218
Ending ALLL related to loans individually evaluated for impairment	85		85		189
Ending ALLL	2,342		2,342		2,407
Collectively evaluated for impairment	302,334		302,334		305,097
Individually evaluated for impairment	6,999		6,999		6,993
Total loans	$ 310,486		$ 310,486		$ 313,277
Ratio of allowance for loan losses to total loans	0.75%		0.75%		0.77%
Commercial real estate loans | Commercial real estate, owner-occupied | Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	$ 0		$ 0		$ 0
Purchased credit-impaired	1,153		1,153		1,187
Commercial real estate loans | Commercial real estate, investor
Allowance for loan losses:
Beginning balance	7,721	7,390	7,703	6,475
Provision for loan losses	211	46	217	961
Charge-offs	0	0	0	0
Recoveries	0	0	12	0
Ending balance	7,932	7,436	7,932	7,436
Ending ALLL related to loans collectively evaluated for impairment	7,887		7,887		7,658
Ending ALLL related to loans individually evaluated for impairment	45		45		45
Ending ALLL	7,932		7,932		7,703
Collectively evaluated for impairment	893,452		893,452		870,778
Individually evaluated for impairment	1,786		1,786		1,821
Total loans	$ 896,066		$ 896,066		$ 873,410
Ratio of allowance for loan losses to total loans	0.89%		0.89%		0.88%
Commercial real estate loans | Commercial real estate, investor | Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	$ 0		$ 0		$ 0
Purchased credit-impaired	828		828		811
Commercial real estate loans | Construction
Allowance for loan losses:
Beginning balance	619	508	756	681
Provision for loan losses	(117)	157	(254)	(16)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	502	665	502	665
Ending ALLL related to loans collectively evaluated for impairment	490		490		756
Ending ALLL related to loans individually evaluated for impairment	12		12		0
Ending ALLL	502		502		756
Collectively evaluated for impairment	49,374		49,374		73,735
Individually evaluated for impairment	880		880		2,688
Total loans	$ 50,254		$ 50,254		$ 76,423
Ratio of allowance for loan losses to total loans	1.00%		1.00%		0.99%
Commercial real estate loans | Construction | Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	$ 0		$ 0		$ 0
Purchased credit-impaired	0		0		0
Residential loans | Home equity
Allowance for loan losses:
Beginning balance	907	952	915	1,031
Provision for loan losses	(28)	(39)	(36)	(118)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	879	913	879	913
Ending ALLL related to loans collectively evaluated for impairment	874		874		910
Ending ALLL related to loans individually evaluated for impairment	5		5		5
Ending ALLL	879		879		915
Collectively evaluated for impairment	121,321		121,321		124,049
Individually evaluated for impairment	419		419		564
Total loans	$ 121,814		$ 121,814		$ 124,696
Ratio of allowance for loan losses to total loans	0.72%		0.72%		0.73%
Allowance for loan losses to non-accrual loans	526.00%		526.00%		292.00%
Residential loans | Home equity | Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	$ 0		$ 0		$ 0
Purchased credit-impaired	74		74		83
Residential loans | Other residential
Allowance for loan losses:
Beginning balance	849	746	800	536
Provision for loan losses	56	35	105	245
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	905	781	905	781
Ending ALLL related to loans collectively evaluated for impairment	905		905		800
Ending ALLL related to loans individually evaluated for impairment	0		0		0
Ending ALLL	905		905		800
Collectively evaluated for impairment	130,327		130,327		117,385
Individually evaluated for impairment	454		454		462
Total loans	$ 130,781		$ 130,781		$ 117,847
Ratio of allowance for loan losses to total loans	0.69%		0.69%		0.68%
Residential loans | Other residential | Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	$ 0		$ 0		$ 0
Purchased credit-impaired	0		0		0
Consumer loans | Installment and other consumer
Allowance for loan losses:
Beginning balance	323	325	310	378
Provision for loan losses	(28)	5	(15)	(88)
Charge-offs	0	0	0	(2)
Recoveries	0	0	0	42
Ending balance	295	330	295	330
Ending ALLL related to loans collectively evaluated for impairment	236		236		237
Ending ALLL related to loans individually evaluated for impairment	59		59		73
Ending ALLL	295		295		310
Collectively evaluated for impairment	27,808		27,808		26,787
Individually evaluated for impairment	653		653		685
Total loans	$ 28,461		$ 28,461		$ 27,472
Ratio of allowance for loan losses to total loans	1.04%		1.04%		1.13%
Allowance for loan losses to non-accrual loans	492.00%		492.00%
Consumer loans | Installment and other consumer | Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	$ 0		$ 0		$ 0
Purchased credit-impaired	0		0		0
Unallocated
Allowance for loan losses:
Beginning balance	727	956	494	718
Provision for loan losses	(41)	(42)	192	196
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	686	$ 914	686	$ 914
Ending ALLL related to loans collectively evaluated for impairment	686		686		494
Ending ALLL related to loans individually evaluated for impairment	0		0		0
Ending ALLL	686		686		494
Collectively evaluated for impairment	0		0		0
Individually evaluated for impairment	0		0		0
Total loans	0		0		0
Unallocated | Purchased credit-impaired
Allowance for loan losses:
Ending ALLL	0		0		0
Purchased credit-impaired	$ 0		$ 0		$ 0

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