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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 477,734 $ 469,607
Gross Unrealized Gains 6,600 2,432
Gross Unrealized Losses 3,214 6,195
Fair Value 481,120 465,844
States and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 77,553 144,596
Gross Unrealized Gains 5,159 1,919
Gross Unrealized Losses 0 1,511
Fair Value 82,712 145,004
GSE residential CMOs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 70,214 110,421
Gross Unrealized Gains 1,142 332
Gross Unrealized Losses 355 2,689
Fair Value 71,001 108,064
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 87,848 75,911
Gross Unrealized Gains 146 55
Gross Unrealized Losses 227 921
Fair Value 87,767 75,045
Asset-backed and other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 242,119 138,535
Gross Unrealized Gains 153 126
Gross Unrealized Losses 2,632 1,073
Fair Value $ 239,640 $ 137,588