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SECURITIES - Fair Value and Age of Gross Unrealized Losses by Investment Category (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security 21 36
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value $ 167,839 $ 271,852
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses $ (1,757) $ (1,373)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 44 15
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 307,481 $ 113,210
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (6,871) $ (2,594)
Temporarily Impaired Debt Securities, Number of Securities | security 65 51
Temporarily Impaired Debt Securities, Fair Value, Total $ 475,320 $ 385,062
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (8,628) $ (3,967)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security 0 3
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value $ 0 $ 19,789
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses $ 0 $ (154)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 1 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 9,736 $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (222) $ 0
Temporarily Impaired Debt Securities, Number of Securities | security 1 3
Temporarily Impaired Debt Securities, Fair Value, Total $ 9,736 $ 19,789
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (222) $ (154)
Obligations of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security 7 9
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value $ 67,649 $ 63,635
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses $ (613) $ (144)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 6 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 35,760 $ 10,017
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (461) $ (49)
Temporarily Impaired Debt Securities, Number of Securities | security 13 10
Temporarily Impaired Debt Securities, Fair Value, Total $ 103,409 $ 73,652
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (1,074) $ (193)
Collateralized mortgage obligations of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security 2 7
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value $ 12,495 $ 47,465
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses $ (44) $ (248)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 14 7
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 76,179 $ 45,809
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (1,941) $ (1,073)
Temporarily Impaired Debt Securities, Number of Securities | security 16 14
Temporarily Impaired Debt Securities, Fair Value, Total $ 88,674 $ 93,274
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (1,985) $ (1,321)
Residential mortgage-backed securities of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security 2 1
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value $ 2,327 $ 2,333
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses $ (45) $ (10)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 3 2
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 9,241 $ 8,638
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (372) $ (203)
Temporarily Impaired Debt Securities, Number of Securities | security 5 3
Temporarily Impaired Debt Securities, Fair Value, Total $ 11,568 $ 10,971
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (417) $ (213)
Commercial mortgage-backed securities of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security 8 14
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value $ 75,466 $ 128,300
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses $ (1,032) $ (775)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 19 5
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 171,318 $ 48,746
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (3,844) $ (1,269)
Temporarily Impaired Debt Securities, Number of Securities | security 27 19
Temporarily Impaired Debt Securities, Fair Value, Total $ 246,784 $ 177,046
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (4,876) $ (2,044)
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security 2 2
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value $ 9,902 $ 10,330
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses $ (23) $ (42)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 1 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 5,247 $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (31) $ 0
Temporarily Impaired Debt Securities, Number of Securities | security 3 2
Temporarily Impaired Debt Securities, Fair Value, Total $ 15,149 $ 10,330
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (54) $ (42)