Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	$ 5,921	$ 8,184	$ 7
Twelve Months or More	508	424	299
Securities Available for Sale, Fair Value
Less Than Twelve Months	650,022	688,376	17,142
Twelve Months or More	15,187	3,453	3,918
State and municipal obligations
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	106	190	4
Securities Available for Sale, Fair Value
Less Than Twelve Months	9,171	11,506	1,356
Government-sponsored entities debt
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	608	846
Securities Available for Sale, Fair Value
Less Than Twelve Months	70,226	84,642
Mortgage-backed securities. issued by Goverment sponsored entities
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	5,207	7,148	3
Twelve Months or More	109	77	28
Securities Available for Sale, Fair Value
Less Than Twelve Months	570,625	592,228	15,786
Twelve Months or More	13,854	2,058	2,447
Common Stock
Securities Available for Sale, Gross Unrealized Losses
Twelve Months or More	399	347	271
Securities Available for Sale, Fair Value
Twelve Months or More	$ 1,333	$ 1,395	$ 1,471

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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