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Allowance for Credit Losses and Credit Quality of Loans, Changes in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Changes in allowance for loan losses by portfolio segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | $ 72,165 | $ 72,965 | [1] | $ 72,505
Charge-offs |  |  | (8,015) |  |  | (24,901)
Recoveries |  |  | 1,891 |  |  | 5,353
Provision | [1] | $ 3,261 | 6,324 | 51,741 |  | 19,408
Balance, end of period |  |  | 72,365 |  |  | 72,365
Commercial Loans [Member] |  |  |  |  |  |
Changes in allowance for loan losses by portfolio segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | 33,152 | 34,525 |  | 32,759
Charge-offs |  |  | (865) |  |  | (2,783)
Recoveries |  |  | 132 |  |  | 344
Provision |  |  | 1,021 |  |  | 3,120
Balance, end of period |  |  | 33,440 |  |  | 33,440
Consumer Loans [Member] |  |  |  |  |  |
Changes in allowance for loan losses by portfolio segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | 36,534 | 35,647 |  | 37,178
Charge-offs |  |  | (6,976) |  |  | (21,336)
Recoveries |  |  | 1,746 |  |  | 4,887
Provision |  |  | 5,031 |  |  | 15,606
Balance, end of period |  |  | 36,335 |  |  | 36,335
Residential Real Estate [Member] |  |  |  |  |  |
Changes in allowance for loan losses by portfolio segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | 2,479 | $ 2,793 |  | 2,568
Charge-offs |  |  | (174) |  |  | (782)
Recoveries |  |  | 13 |  |  | 122
Provision |  |  | 272 |  |  | 682
Balance, end of period |  |  | $ 2,590 |  |  | $ 2,590
[1] | Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

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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. + 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 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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