This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

Name:	us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

Securities - (Details 3) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Amortized Cost
Due within one year	$ 14,605
Due after one year through five years	108,014
Due after five years through ten years	129,897
Due after ten years	87,103
Amortized Cost	339,619		$ 356,282
Fair Value
Due within one year	14,735
Due after one year through five years	111,811
Due after five years through ten years	135,500
Due after ten years	91,018
Fair Value	353,064		362,893
Amortized Cost
Due within one year	0
Due after one year through five years	2,053
Due after five years through ten years	3,040
Due after ten years	21,793
Amortized Cost	740,236		686,405
Fair Value
Due within one year	0
Due after one year through five years	2,134
Due after five years through ten years	3,116
Due after ten years	16,992
Securities available for sale	737,006		674,248
Residential mortgage-backed securities
Amortized Cost
Available for sale debt securities		$ 2,946
Other debt securities
Amortized Cost
Other debt securities, amortized cost	19,479
Amortized Cost	22,519		22,053
Fair Value
Other debt securities, fair value	19,785
Securities available for sale	22,901		22,145
Government agency mortgage backed securities \| Residential mortgage-backed securities
Amortized Cost
Available for sale debt securities	419,848
Amortized Cost	419,848		414,019
Fair Value
Securities available for sale	420,877		409,317
Government agency mortgage backed securities \| Commercial mortgage-backed securities
Amortized Cost
Available for sale debt securities	50,167
Amortized Cost	50,167		50,628
Fair Value
Securities available for sale	51,053		50,863
Government agency collateralized mortgage obligations \| Residential mortgage-backed securities
Amortized Cost
Available for sale debt securities	222,110
Amortized Cost	222,110		171,362
Fair Value
Securities available for sale	221,295		168,826
Government agency collateralized mortgage obligations \| Commercial mortgage-backed securities
Amortized Cost
Available for sale debt securities	1,746
Amortized Cost	1,746		2,528
Fair Value
Securities available for sale	$ 1,754		$ 2,550