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Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses by Portfolio Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Provision | [1] | $ 29,640 | $ 5,807
Balance, end of period | [1] | 100,000 |
ASU 2016-13 [Member] |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Balance, beginning of period |  | 75,999 |
Charge-offs |  | (8,226) |
Recoveries |  | 2,587 |
Provision |  | 29,640 |
Balance, end of period |  | 100,000 |
ASU 2016-13 [Member] | Commercial Loans [Member] |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Balance, beginning of period |  | 27,156 |
Charge-offs |  | (1,020) |
Recoveries |  | 228 |
Provision |  | 15,848 |
Balance, end of period |  | 42,212 |
ASU 2016-13 [Member] | Consumer Loans [Member] |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Balance, beginning of period |  | 32,122 |
Charge-offs |  | (6,891) |
Recoveries |  | 2,235 |
Provision |  | 10,080 |
Balance, end of period |  | 37,546 |
ASU 2016-13 [Member] | Residential [Member] |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Balance, beginning of period |  | 16,721 |
Charge-offs |  | (315) |
Recoveries |  | 124 |
Provision |  | 3,712 |
Balance, end of period |  | $ 20,242 |
[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 financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: 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=118936363&loc=SL6953423-111524 + Details
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