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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 245 336
Total temporary impaired securities    
Less than 12 months, Fair Value $ 64,031 $ 254,634
Less than 12 months, Unrealized Losses (622) (2,729)
12 months or longer, Fair Value 902,940 896,550
12 months or longer, Unrealized Losses (16,179) (26,733)
Total, Fair Value 966,971 1,151,184
Total, Unrealized Losses (16,801) (29,462)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 13,980 38,099
Less than 12 months, Unrealized Losses (20) (157)
12 months or longer, Fair Value 35,577 49,505
12 months or longer, Unrealized Losses (542) (1,318)
Total, Fair Value 49,557 87,604
Total, Unrealized Losses (562) (1,475)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 0 49,729
Less than 12 months, Unrealized Losses 0 (250)
12 months or longer, Fair Value 25,054 5,120
12 months or longer, Unrealized Losses (87) (160)
Total, Fair Value 25,054 54,849
Total, Unrealized Losses (87) (410)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 12,630 30,029
Less than 12 months, Unrealized Losses (93) (613)
12 months or longer, Fair Value 18,907 2,545
12 months or longer, Unrealized Losses (355) (70)
Total, Fair Value 31,537 32,574
Total, Unrealized Losses (448) (683)
Residential - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 22,533 88,957
Less than 12 months, Unrealized Losses (461) (1,229)
12 months or longer, Fair Value 645,030 666,685
12 months or longer, Unrealized Losses (13,056) (21,437)
Total, Fair Value 667,563 755,642
Total, Unrealized Losses (13,517) (22,666)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 0 0
Less than 12 months, Unrealized Losses 0 0
12 months or longer, Fair Value 15,478 24,515
12 months or longer, Unrealized Losses (112) (464)
Total, Fair Value 15,478 24,515
Total, Unrealized Losses (112) (464)
Commercial - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 0 13,973
Less than 12 months, Unrealized Losses 0 (247)
12 months or longer, Fair Value 102,257 101,500
12 months or longer, Unrealized Losses (1,283) (2,365)
Total, Fair Value 102,257 115,473
Total, Unrealized Losses (1,283) (2,612)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 14,888 33,847
Less than 12 months, Unrealized Losses (48) (233)
12 months or longer, Fair Value 60,637 46,680
12 months or longer, Unrealized Losses (744) (919)
Total, Fair Value 75,525 80,527
Total, Unrealized Losses $ (792) $ (1,152)