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SECURITIES AVAILABLE FOR SALE - Summary of Amortized Cost and Fair Value and Corresponding Amounts of Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 490,993 | $ 469,607
Gross Unrealized Gains | 5,582 | 2,432
Gross Unrealized Losses | 6,189 | 6,195
Fair Value | 490,386 | 465,844
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 83,607 | 144,596
Gross Unrealized Gains | 4,288 | 1,919
Gross Unrealized Losses | 32 | 1,511
Fair Value | 87,863 | 145,004
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 67,928 | 110,421
Gross Unrealized Gains | 1,000 | 332
Gross Unrealized Losses | 774 | 2,689
Fair Value | 68,154 | 108,064
Non-agency CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 17,210 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 123 |
Fair Value | 17,087 |
Private label residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 144
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 1
Fair Value |  | 143
Private label commercial CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 86,704 | 75,911
Gross Unrealized Gains | 156 | 55
Gross Unrealized Losses | 231 | 921
Fair Value | 86,629 | 75,045
Asset-backed and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 235,544 | 138,535
Gross Unrealized Gains | 138 | 126
Gross Unrealized Losses | 5,029 | 1,073
Fair Value | $ 230,653 | $ 137,588

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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