| **Purchased Credit Impaired Loans - Accretable Yield or Income Expected to be Collected (Details) - USD ($) $ in Thousands**   | 3 Months Ended | 9 Months Ended |          |
|--------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|----------|
||
| **Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]** |           |           |     |   |   |
| Beginning balance                                                                                                              | $ 2,423        | $ 2,607        | $ 2,890  | $ 3,951 |   |
| Additions                                                                                                                      |                | 941            |          | 1,608 |   |
| Accretion                                                                                                                      | (1,004)        | (686)          | (2,441)  | (5,082) |   |
| Reclassification from nonaccretable                                                                                            | 798            | 449            | 1,768    | 3,501 |   |
| Disposals                                                                                                                      | (16)           |                | (16)     | (667) |   |
| Ending balance                                                                                                                 | 2,201          | $ 3,311        | 2,201    | $ 3,311 |   |
| Loans acquired with deteriorated credit quality                                                                                |           |           |     |   |   |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]**                                                               |           |           |     |   |   |
| Loans acquired and accounted for under ASC 310-30, carrying amount                                                             | $ 20,600       |           | $ 20,600 |   | $ 25,300 |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
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| - Definition
Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.
+ References
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| - Definition
Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.
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| - Definition
Amount of reduction, resulting from a sale or transfer of a loan, in the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase of reclassification from nonaccretable difference to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses).  This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.
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