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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | $ 26,881 | $ 48,444 |
Net credit losses (recoveries) | 40 | (1,397) | $ 154
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Subject To Be Purchased | 100 | 300 |
On-balance sheet [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | 19,577 | 47,881 |
Net credit losses (recoveries) | 40 | (1,397) | 154
Off-balance sheet [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Financing Receivable, Recorded Investment, Past Due | 7,304 | 563 |
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 Net credit losses (recoveries) includes chargeoffs recoveries of chargeoffs REO writedowns and gain (loss) on REO Sales + 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://fasb.org/us-gaap/role/ref/legacyRef -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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