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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Summary of Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, available for sale securities, less than twelve months, gross unrealized losses $ 895 $ 1,287
Debt securities, available for sale securities, over twelve months, gross unrealized losses 12 1,000
Debt securities, available for sale securities, continuous unrealized loss position, accumulated loss 907 2,287
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, available for sale securities, continuous unrealized loss position, less than twelve months, fair value 214,771 180,826
Debt securities, available for sale securities, continuous unrealized loss position, over twelve months, fair value 1,321 83,773
Debt securities, available for sale securities, continuous unrealized loss position, fair value 216,092 264,599
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss 9 55
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses 0 910
Held to maturity securities, accumulated unrecognized holding loss 9 965
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value 1,430 10,578
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value 0 6,925
Held to maturity securities, accumulated unrecognized holding loss, fair value 1,430 17,503
Securities available for sale and held to maturity    
Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, aggregate losses 904 1,342
Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, fair value 216,201 191,404
Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, aggregate losses 12 1,910
Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, fair value 1,321 90,698
Held to maturity and available for sale securities continuous unrealized loss position, aggregate losses 916 3,252
Held to maturity and available for sale securities continuous unrealized loss position, fair value 217,522 282,102
Municipal bonds and obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, available for sale securities, less than twelve months, gross unrealized losses 13  
Debt securities, available for sale securities, over twelve months, gross unrealized losses 0  
Debt securities, available for sale securities, continuous unrealized loss position, accumulated loss 13  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, available for sale securities, continuous unrealized loss position, less than twelve months, fair value 3,451  
Debt securities, available for sale securities, continuous unrealized loss position, over twelve months, fair value 0  
Debt securities, available for sale securities, continuous unrealized loss position, fair value 3,451  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss   5
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses   0
Held to maturity securities, accumulated unrecognized holding loss   5
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value   800
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value   0
Held to maturity securities, accumulated unrecognized holding loss, fair value   800
Agency collateralized mortgage obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, available for sale securities, less than twelve months, gross unrealized losses 124 127
Debt securities, available for sale securities, over twelve months, gross unrealized losses 0 42
Debt securities, available for sale securities, continuous unrealized loss position, accumulated loss 124 169
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, available for sale securities, continuous unrealized loss position, less than twelve months, fair value 44,785 52,623
Debt securities, available for sale securities, continuous unrealized loss position, over twelve months, fair value 0 6,267
Debt securities, available for sale securities, continuous unrealized loss position, fair value 44,785 58,890
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss   50
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses   0
Held to maturity securities, accumulated unrecognized holding loss   50
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value   9,778
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value   0
Held to maturity securities, accumulated unrecognized holding loss, fair value   9,778
Agency mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, available for sale securities, less than twelve months, gross unrealized losses 434 59
Debt securities, available for sale securities, over twelve months, gross unrealized losses 3 301
Debt securities, available for sale securities, continuous unrealized loss position, accumulated loss 437 360
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, available for sale securities, continuous unrealized loss position, less than twelve months, fair value 133,536 10,640
Debt securities, available for sale securities, continuous unrealized loss position, over twelve months, fair value 257 23,404
Debt securities, available for sale securities, continuous unrealized loss position, fair value 133,793 34,044
Agency commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, available for sale securities, less than twelve months, gross unrealized losses 102 1,097
Debt securities, available for sale securities, over twelve months, gross unrealized losses 0 49
Debt securities, available for sale securities, continuous unrealized loss position, accumulated loss 102 1,146
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, available for sale securities, continuous unrealized loss position, less than twelve months, fair value 22,336 116,324
Debt securities, available for sale securities, continuous unrealized loss position, over twelve months, fair value 0 11,250
Debt securities, available for sale securities, continuous unrealized loss position, fair value 22,336 127,574
Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, available for sale securities, less than twelve months, gross unrealized losses 222 0
Debt securities, available for sale securities, over twelve months, gross unrealized losses 0 607
Debt securities, available for sale securities, continuous unrealized loss position, accumulated loss 222 607
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, available for sale securities, continuous unrealized loss position, less than twelve months, fair value 10,663 0
Debt securities, available for sale securities, continuous unrealized loss position, over twelve months, fair value 0 42,823
Debt securities, available for sale securities, continuous unrealized loss position, fair value 10,663 42,823
Other bonds and obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt securities, available for sale securities, less than twelve months, gross unrealized losses 0 4
Debt securities, available for sale securities, over twelve months, gross unrealized losses 9 1
Debt securities, available for sale securities, continuous unrealized loss position, accumulated loss 9 5
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Debt securities, available for sale securities, continuous unrealized loss position, less than twelve months, fair value 0 1,239
Debt securities, available for sale securities, continuous unrealized loss position, over twelve months, fair value 1,064 29
Debt securities, available for sale securities, continuous unrealized loss position, fair value 1,064 1,268
Tax advantaged economic development bonds    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss 9 0
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses 0 910
Held to maturity securities, accumulated unrecognized holding loss 9 910
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value 1,430 0
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value 0 6,925
Held to maturity securities, accumulated unrecognized holding loss, fair value $ 1,430 $ 6,925