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Non-performing Loans and Impaired Loans - Collateral Pledged Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | $ 3,707,299 | $ 3,634,596
Real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 981,048 | 920,998
Real estate | Residential mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 733,034 | 751,019
Commercial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 2,050,402 | 2,047,646
Commercial | Owner occupied real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 510,901 | 519,577
Commercial | Non-owner occupied real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 992,595 | 973,331
Commercial | Commercial and industrial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 502,247 | $ 505,859
Collateral Pledged [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 4,439 |
Collateral Pledged [Member] | Real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 681 |
Collateral Pledged [Member] | Real estate | Residential mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 681 |
Collateral Pledged [Member] | Commercial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 3,758 |
Collateral Pledged [Member] | Commercial | Owner occupied real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 3,018 |
Collateral Pledged [Member] | Commercial | Non-owner occupied real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | 114 |
Collateral Pledged [Member] | Commercial | Commercial and industrial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total collateral dependent loans | $ 626 |

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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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