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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 492,616 $ 469,607
Gross Unrealized Gains 7,525 2,432
Gross Unrealized Losses 3,211 6,195
Fair Value 496,930 465,844
States and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 96,080 144,596
Gross Unrealized Gains 6,030 1,919
Gross Unrealized Losses 0 1,511
Fair Value 102,110 145,004
GSE residential CMOs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 72,269 110,421
Gross Unrealized Gains 1,055 332
Gross Unrealized Losses 903 2,689
Fair Value 72,421 108,064
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 94,354 75,911
Gross Unrealized Gains 299 55
Gross Unrealized Losses 225 921
Fair Value 94,428 75,045
Asset-backed and other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 229,913 138,535
Gross Unrealized Gains 141 126
Gross Unrealized Losses 2,083 1,073
Fair Value $ 227,971 $ 137,588