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Investment securities - Restricted Investment In Stock (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) security	Mar. 31, 2018 USD ($)
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss position	137
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	60
Number of securities in continuous unrealized loss positions 12 months or longer	57
U.S. Treasuries
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss position	7
Number of securities in continuous unrealized loss positions 12 months or longer	7
U.S. Government-sponsored enterprises state and municipals
Available-for-sale and Held-to-maturity securities
Number of securities in continuous unrealized loss position	35
Number of securities in continuous unrealized loss positions 12 months or longer	35
Other-than-temporary impairments recognized | $	$ 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	35
Number of securities in continuous unrealized loss positions 12 months or longer	32

X

- Definition

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.

+ References

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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=109979856&loc=SL6284422-111562

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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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