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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 496,282	$ 411,706
Gross Unrealized Gains	1,811	7,496
Gross Unrealized Losses	8,737	3,894
Fair Value	489,356	415,308
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	161,146	153,803
Gross Unrealized Gains	1,251	6,133
Gross Unrealized Losses	2,977	478
Fair Value	159,420	159,458
GSE residential MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		48,600
Gross Unrealized Gains		930
Gross Unrealized Losses		0
Fair Value		49,530
GSE residential CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	113,335	113,658
Gross Unrealized Gains	39	296
Gross Unrealized Losses	4,720	2,835
Fair Value	108,654	111,119
Private label residential CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	313	999
Gross Unrealized Gains	0	4
Gross Unrealized Losses	1	0
Fair Value	312	1,003
Private label commercial CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	61,560	7,809
Gross Unrealized Gains	18	0
Gross Unrealized Losses	368	156
Fair Value	61,210	7,653
Asset-backed and other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	159,928	86,837
Gross Unrealized Gains	503	133
Gross Unrealized Losses	671	425
Fair Value	$ 159,760	$ 86,545

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

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

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