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Fair Value Fair Value (Impaired Financing Receivables Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Book Value Of Impaired Loans Carried At Fair Value | $ 11,660 | $ 11,783 |
Partial Charge-Offs On Impaired Loans carried at Fair Value | 10,463 | 10,512 |
Impaired Financing Receivable, Related Allowance | 4,930 | 4,191 |
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount | 64,041 | 66,977 |
Impaired Financing Receivable, Recorded Investment | 78,171 | 80,664 | $ 70,492
Impaired Loan Fair Value | 9,200 | 9,496 |
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment | 66,511 | 68,881 |
Partial Charge-offs on Impaired Loans carried at Cost | 17,959 | 18,193 |
Impaired Financing Receivable, Carrying Value | 73,241 | 76,473 |
Partial Charge-Offs On Impaired Loans | 28,422 | 28,705 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 4,930 | 4,191 |
Financing Receivable, not collateral dependent [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | 2,470 | 1,904 |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | $ 2,460 | $ 2,287 |

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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