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Non-performing Loans - Collateral Pledged Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | $ 4,030,365 | $ 3,634,596
Real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 1,049,873 | 920,998
Real estate | Residential mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 651,680 | 751,019
Commercial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 2,321,608 | 2,047,646
Commercial | Owner occupied real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 503,127 | 519,577
Commercial | Non–owner occupied real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 1,019,171 | 973,331
Commercial | Commercial and industrial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 761,735 | $ 505,859
Collateral Pledged |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 4,260 |
Collateral Pledged | Commercial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 4,260 |
Collateral Pledged | Commercial | Owner occupied real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 3,018 |
Collateral Pledged | Commercial | Non–owner occupied real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 488 |
Collateral Pledged | Commercial | Commercial and industrial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | $ 754 |

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- Definition Amount, before allowance for credit loss, of 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 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 + Details
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