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Investment securities - Restricted Investment In Stock (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) security	Sep. 30, 2018 USD ($)
Available-for-sale and Held-to-maturity securities
Gross realized gains | $			$ 23
Number of securities in continuous unrealized loss position			72
Other-than-temporary impairments recognized | $			$ 0
State and Municipals, Tax-exempt
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss position			10
Number of securities in continuous unrealized loss positions 12 months or longer			2
State and Municipals, Taxable
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss position			9
U.S. Treasuries
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss position			4
Number of securities in continuous unrealized loss positions 12 months or longer			2
U.S. Government-sponsored enterprises state and municipals
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss position			25
Number of securities in continuous unrealized loss positions 12 months or longer			17
Other-than-temporary impairments recognized | $	$ 0	$ 0	$ 0	$ 0
Mortgage-backed Securities, U.S. Government-sponsored enterprises
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss position			24
Number of securities in continuous unrealized loss positions 12 months or longer			20

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The number of securities in continuous unrealized loss position.

+ References

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- Definition

Number of securities in continuous unrealized loss position for more than 12 months.

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- Definition

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563

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- Definition

Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562

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