Allowance for credit losses - Quantitative information by loan class for loans modified as T D R (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) loans	Mar. 31, 2019 USD ($) loans
Financing Receivable
Loan count \| loans	466	578
Pre-Modification Recorded Investment	$ 32,048	$ 32,430
Post Modification Recorded Investment	29,613	30,694
Increase (decrease) in the allowance for loan losses as a result of modification	$ 2,650	$ 2,059
Mortgages
Financing Receivable
Loan count \| loans	175	190
Pre-Modification Recorded Investment	$ 20,315	$ 20,732
Post Modification Recorded Investment	17,940	18,591
Increase (decrease) in the allowance for loan losses as a result of modification	$ 2,012	$ 671
Commercial \| CRE non-owner occupied
Financing Receivable
Loan count \| loans	1	1
Pre-Modification Recorded Investment	$ 104	$ 314
Post Modification Recorded Investment	104	311
Increase (decrease) in the allowance for loan losses as a result of modification	$ (8)	$ 18
Commercial \| CRE owner occupied
Financing Receivable
Loan count \| loans	6	10
Pre-Modification Recorded Investment	$ 3,906	$ 2,019
Post Modification Recorded Investment	3,902	1,973
Increase (decrease) in the allowance for loan losses as a result of modification	$ 105	$ 19
Commercial \| Commercial and Industrial
Financing Receivable
Loan count \| loans	13	16
Pre-Modification Recorded Investment	$ 4,070	$ 3,943
Post Modification Recorded Investment	4,068	4,479
Increase (decrease) in the allowance for loan losses as a result of modification	$ (717)	$ 314
Consumer \| Credit cards
Financing Receivable
Loan count \| loans	161	189
Pre-Modification Recorded Investment	$ 1,260	$ 1,543
Post Modification Recorded Investment	1,273	1,530
Increase (decrease) in the allowance for loan losses as a result of modification	$ 84	$ 171
Consumer \| Home equity lines of credit
Financing Receivable
Loan count \| loans	1	10
Pre-Modification Recorded Investment	$ 332	$ 694
Post Modification Recorded Investment	265	621
Increase (decrease) in the allowance for loan losses as a result of modification	$ 854	$ 55
Consumer \| Personal loans
Financing Receivable
Loan count \| loans	102	154
Pre-Modification Recorded Investment	$ 1,861	$ 3,147
Post Modification Recorded Investment	1,859	3,153
Increase (decrease) in the allowance for loan losses as a result of modification	$ 297	$ 805
Consumer \| Auto Loan
Financing Receivable
Loan count \| loans	3	2
Pre-Modification Recorded Investment	$ 86	$ 25
Post Modification Recorded Investment	87	23
Increase (decrease) in the allowance for loan losses as a result of modification	$ 12	$ 4
Consumer \| Other
Financing Receivable
Loan count \| loans	1	6
Pre-Modification Recorded Investment	$ 20	$ 13
Post Modification Recorded Investment	20	13
Increase (decrease) in the allowance for loan losses as a result of modification	$ 5	$ 2
Leasing
Financing Receivable
Loan count \| loans	3
Pre-Modification Recorded Investment	$ 94
Post Modification Recorded Investment	95
Increase (decrease) in the allowance for loan losses as a result of modification	$ 6

Increase (decrease) in the allowance for loan losses as a result of modification.

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+ References

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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