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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 | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | $ 48,444 | $ 21,038 |
Net credit losses (recoveries) | (1,397) | 154 | $ 3,853
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Subject To Be Purchased | 300 | 100 |
On-balance sheet [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | 47,881 | 19,757 |
Net credit losses (recoveries) | (1,397) | 154 | 3,853
Off-balance sheet [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | 563 | 1,281 |
Net credit losses (recoveries) | $ 0 | $ 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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