INVESTMENT SECURITIES - AFS (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-Sale Debt Securities
Amortized Cost	$ 419,911	$ 524,112
Gross Unrealized Gains	3,428	3,590
Gross Unrealized Losses	(5,356)	(3,399)
Fair Value	417,983	524,303
U.S. Treasury securities and U.S. Government agencies
Available-for-Sale Debt Securities
Amortized Cost	219,157	309,042
Gross Unrealized Gains		1
Gross Unrealized Losses	(2,156)	(1,451)
Fair Value	217,001	307,592
Private label mortgage backed security
Available-for-Sale Debt Securities
Amortized Cost	2,738	3,065
Gross Unrealized Gains	1,382	1,384
Fair Value	4,120	4,449
Mortgage backed securities - residential
Available-for-Sale Debt Securities
Amortized Cost	100,439	105,644
Gross Unrealized Gains	1,370	1,603
Gross Unrealized Losses	(1,571)	(873)
Fair Value	100,238	106,374
Collateralized mortgage obligations
Available-for-Sale Debt Securities
Amortized Cost	84,074	87,867
Gross Unrealized Gains	279	371
Gross Unrealized Losses	(1,608)	(1,075)
Fair Value	82,745	87,163
Corporate bonds
Available-for-Sale Debt Securities
Amortized Cost	10,000	15,001
Gross Unrealized Gains		124
Gross Unrealized Losses	(21)
Fair Value	9,979	15,125
Trust preferred security
Available-for-Sale Debt Securities
Amortized Cost	3,503	3,493
Gross Unrealized Gains	397	107
Fair Value	$ 3,900	$ 3,600

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803

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