Long-Term Borrowings (Narrative) (Details) $ in Thousands	9 Months Ended
Sep. 30, 2017 USD ($) contract	Dec. 31, 2016 USD ($)
Long-term borrowings	$ 195,890	$ 145,155
Junior subordinated debt securities	7,061	$ 6,924
Unadvanced revolving line of credit	$ 15,000
Federal Home Loan Bank Advances, Fixed Rate, Amortizing [Member] \| Minimum
Federal Home Loan Bank, advances, general debt obligations, disclosures, maturities period	10 years
Federal Home Loan Bank Advances, Fixed Rate, Amortizing [Member] \| Maximum
Federal Home Loan Bank, advances, general debt obligations, disclosures, maturities period	20 years
Federal Home Loan Bank Advances, Fixed Rate, Putable Non-amortizing [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 75,000
Federal Home Loan Bank Advances, Fixed Rate, Putable Non-amortizing [Member] \| Minimum
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	1.20%
Federal Home Loan Bank Advances, Fixed Rate, Putable Non-amortizing [Member] \| Maximum
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	2.03%
Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Interest Rate Swap [Member]
Derivative, Number of Instruments Held \| contract	7
Derivative, Notional Amount	$ 60,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The number of derivative instruments of a particular group held by the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
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Amount of advances from the Federal Home Loan Bank (FHLB).

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Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Maturity period on fixed rate advances made and reported by Federal Home Loan Bank (FHLBank), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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