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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of Investment Securities Available for Sale (Details) - Debt Securities - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Totals | $ 457,633 | $ 411,706
Gross Unrealized Gains |  |
Totals | 3,079 | 7,496
Gross Unrealized Losses |  |
Totals | 5,912 | 3,894
Fair Value |  |
Totals | 454,800 | 415,308
States and political subdivisions |  |
Amortized Cost |  |
Totals | 181,682 | 153,803
Gross Unrealized Gains |  |
Totals | 2,755 | 6,133
Gross Unrealized Losses |  |
Totals | 1,644 | 478
Fair Value |  |
Totals | 182,793 | 159,458
GSE residential MBSs |  |
Amortized Cost |  |
Totals |  | 48,600
Gross Unrealized Gains |  |
Totals |  | 930
Gross Unrealized Losses |  |
Totals |  | 0
Fair Value |  |
Totals |  | 49,530
GSE residential CMOs |  |
Amortized Cost |  |
Totals | 120,291 | 113,658
Gross Unrealized Gains |  |
Totals | 156 | 296
Gross Unrealized Losses |  |
Totals | 3,492 | 2,835
Fair Value |  |
Totals | 116,955 | 111,119
Private label residential CMOs |  |
Amortized Cost |  |
Totals | 849 | 999
Gross Unrealized Gains |  |
Totals | 4 | 4
Gross Unrealized Losses |  |
Totals | 0 | 0
Fair Value |  |
Totals | 853 | 1,003
Private label commercial CMOs |  |
Amortized Cost |  |
Totals | 12,914 | 7,809
Gross Unrealized Gains |  |
Totals | 0 | 0
Gross Unrealized Losses |  |
Totals | 225 | 156
Fair Value |  |
Totals | 12,689 | 7,653
Asset-backed and other |  |
Amortized Cost |  |
Totals | 141,897 | 86,837
Gross Unrealized Gains |  |
Totals | 164 | 133
Gross Unrealized Losses |  |
Totals | 551 | 425
Fair Value |  |
Totals | $ 141,510 | $ 86,545

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition 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. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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