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Investment securities - Restricted Investment In Stock (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Other-than-temporary impairments recognized	$ 0
Value of common stock	$ 14,793	$ 14,793
Visa Class A stock
Conversion ratio of common stock	1.6483
Visa Class B stock
Shares held | shares	44,982
Value of common stock	$ 0
Federal Home Loan Bank of Pittsburgh (FHLB)
Value of common stock	10,189
Atlantic Community Bankers Bank (ACBB)
Value of common stock	$ 42

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
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The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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