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Loans and Allowance for Loan Losses - Changes in allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in the allowance
Beginning Balance	$ 23,924	$ 22,174	$ 16,564
Provision for loan losses	10,900	7,312	8,610
Loan charge-offs	(5,368)	(7,578)	(4,253)
Loan recoveries	4,790	2,016	1,253
Ending Balance	34,246	23,924	22,174
Unallocated
Changes in the allowance
Beginning Balance	2,192	1,177	911
Provision for loan losses	(814)	1,015	266
Ending Balance	1,378	2,192	1,177
Commercial
Changes in the allowance
Beginning Balance	19,261	18,656	12,841
Provision for loan losses	6,372	5,523	8,765
Loan charge-offs	(5,114)	(6,541)	(3,783)
Loan recoveries	4,449	1,623	833
Ending Balance	24,968	19,261	18,656
Commercial | Commercial and industrial
Changes in the allowance
Beginning Balance	12,270	12,127	7,589
Provision for loan losses	(2,168)	5,213	6,911
Loan charge-offs	(4,249)	(6,540)	(3,123)
Loan recoveries	4,352	1,470	750
Ending Balance	10,205	12,270	12,127
Commercial | Real estate construction
Changes in the allowance
Beginning Balance	303	250	343
Provision for loan losses	355	51	(35)
Loan charge-offs		(1)	(60)
Loan recoveries		3	2
Ending Balance	658	303	250
Commercial | Commercial real estate
Changes in the allowance
Beginning Balance	6,688	6,279	4,909
Provision for loan losses	8,185	259	1,889
Loan charge-offs	(865)		(600)
Loan recoveries	97	150	81
Ending Balance	14,105	6,688	6,279
Consumer
Changes in the allowance
Beginning Balance	2,471	2,341	2,812
Provision for loan losses	5,342	774	(421)
Loan charge-offs	(254)	(1,037)	(470)
Loan recoveries	341	393	420
Ending Balance	7,900	2,471	2,341
Consumer | Residential | Real estate first mortgage
Changes in the allowance
Beginning Balance	1,448	1,156	1,411
Provision for loan losses	4,321	292	(226)
Loan charge-offs			(29)
Loan recoveries	5
Ending Balance	5,774	1,448	1,156
Consumer | Residential | Real estate junior lien
Changes in the allowance
Beginning Balance	671	805	902
Provision for loan losses	507	99	(171)
Loan charge-offs	(12)	(465)	(133)
Loan recoveries	207	232	207
Ending Balance	1,373	671	805
Consumer | Other revolving and installment
Changes in the allowance
Beginning Balance	352	380	499
Provision for loan losses	514	383	(24)
Loan charge-offs	(242)	(572)	(308)
Loan recoveries	129	161	213
Ending Balance	$ 753	$ 352	$ 380

X

- Definition

Amount of increase in allowance for credit loss on accounts receivable, from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (e)
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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- Definition

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+ References

No definition available.

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- Definition

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.

+ References

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