Subordinated Debentures, Notes, And Other Borrowings (Narrative) (Details)
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9 Months Ended |
12 Months Ended |
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|
Sep. 30, 2017
USD ($)
item
|
Dec. 31, 2016
USD ($)
|
Mar. 05, 2015
USD ($)
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| Debt Instrument [Line Items] |
|
|
|
| Number of issuances of junior subordinated debentures | item |
2
|
|
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| Repurchase agreements |
$ 15,383,000
|
$ 11,889,000
|
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| State and municipal securites sold |
$ 15,700,000
|
$ 12,100,000
|
|
| Repurchase agreement amount, percentage |
102.00%
|
102.00%
|
|
| Subordinated Note [Member] |
|
|
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| Debt Instrument [Line Items] |
|
|
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| Debt instrument, face amount |
|
|
$ 9,750,000
|
| Debt maturity date |
Mar. 06, 2025
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| Subordinated Note [Member] | Maximum [Member] |
|
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| Debt Instrument [Line Items] |
|
|
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| Variable interest rate |
5.75%
|
|
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| Subordinated Note [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Variable interest rate |
3.00%
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| Fixed Rate, First 5 Years [Member] | Subordinated Note [Member] |
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| Debt Instrument [Line Items] |
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| Fixed interest rate |
4.25%
|
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| Interest rate period, in years |
5 years
|
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| Prime Rate [Member] | Subordinated Note [Member] |
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| Debt Instrument [Line Items] |
|
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| Basis spread on variable rate |
1.00%
|
|
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| DNB Capital Trust I [Member] |
|
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| Debt Instrument [Line Items] |
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| Issuance date |
Jul. 20, 2001
|
|
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| Floating rate capital preferred securities |
$ 5,000,000
|
|
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| LIBOR rate, borrowing period, in months |
6 months
|
|
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| Basis spread on variable rate |
3.75%
|
|
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| Fixed interest rate |
12.00%
|
|
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| Principal amount, floating rate junior subordinated debentures |
$ 5,200,000
|
|
|
| Maturity date range, start |
Jul. 25, 2006
|
|
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| Maturity date range, end |
Jul. 25, 2031
|
|
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| DNB Capital Trust II [Member] |
|
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| Debt Instrument [Line Items] |
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| Issuance date |
Mar. 30, 2005
|
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| Floating rate capital preferred securities |
$ 4,000,000
|
|
|
| LIBOR rate, borrowing period, in months |
3 months
|
|
|
| Basis spread on variable rate |
1.77%
|
|
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| Fixed interest rate |
6.56%
|
|
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| Interest rate period, in years |
5 years
|
|
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| Principal amount, floating rate junior subordinated debentures |
$ 4,100,000
|
|
|
| Maturity date range, start |
May 23, 2010
|
|
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| Maturity date range, end |
May 23, 2035
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