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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 98 336
INVESTMENT SECURITIES    
Less than 12 months, Fair Value $ 163,144 $ 254,634
Less than 12 months, Unrealized Losses (1,165) (2,729)
12 months or longer, Fair Value 269,242 896,550
12 months or longer, Unrealized Losses (2,840) (26,733)
Total, Fair Value 432,386 1,151,184
Total, Unrealized Losses (4,005) (29,462)
States and political subdivisions    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 7,007 38,099
Less than 12 months, Unrealized Losses (26) (157)
12 months or longer, Fair Value 1,253 49,505
12 months or longer, Unrealized Losses (27) (1,318)
Total, Fair Value 8,260 87,604
Total, Unrealized Losses (53) (1,475)
Corporate securities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 0 49,729
Less than 12 months, Unrealized Losses 0 (250)
12 months or longer, Fair Value 0 5,120
12 months or longer, Unrealized Losses 0 (160)
Total, Fair Value 0 54,849
Total, Unrealized Losses 0 (410)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 16,815 30,029
Less than 12 months, Unrealized Losses (122) (613)
12 months or longer, Fair Value 20,507 2,545
12 months or longer, Unrealized Losses (211) (70)
Total, Fair Value 37,322 32,574
Total, Unrealized Losses (333) (683)
Residential - U.S. Government-sponsored entities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 103,254 88,957
Less than 12 months, Unrealized Losses (631) (1,229)
12 months or longer, Fair Value 247,482 666,685
12 months or longer, Unrealized Losses (2,602) (21,437)
Total, Fair Value 350,736 755,642
Total, Unrealized Losses (3,233) (22,666)
Residential - Non-government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 0 0
Less than 12 months, Unrealized Losses 0 0
12 months or longer, Fair Value 0 24,515
12 months or longer, Unrealized Losses 0 (464)
Total, Fair Value 0 24,515
Total, Unrealized Losses 0 (464)
Commercial - U.S. Government-sponsored entities    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 36,068 13,973
Less than 12 months, Unrealized Losses (386) (247)
12 months or longer, Fair Value 0 101,500
12 months or longer, Unrealized Losses 0 (2,365)
Total, Fair Value 36,068 115,473
Total, Unrealized Losses (386) (2,612)
Commercial - Non-government agencies    
INVESTMENT SECURITIES    
Less than 12 months, Fair Value 0 33,847
Less than 12 months, Unrealized Losses 0 (233)
12 months or longer, Fair Value 0 46,680
12 months or longer, Unrealized Losses 0 (919)
Total, Fair Value 0 80,527
Total, Unrealized Losses $ 0 $ (1,152)