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Loans and Allowance for Losses and Concentrations of Credit Risk - Certain Loans Acquired Delinquencies and Net Credit Losses (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | $ 37,545 |  | $ 48,444
Net credit losses (recoveries) | 40 | $ (520) |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Subject To Be Purchased | 200 |  | 300
On-balance sheet [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | 32,756 |  | 47,881
Net credit losses (recoveries) | 40 | (520) |
Off-balance sheet [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | 4,789 |  | $ 563
Net credit losses (recoveries) | $ 0 | $ 0 |

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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Subject To Be Purchased + References No definition available. + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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