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SECURITIES, Securities with Unrealized Losses, Available for Sale (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Available for sale, Fair Value [Abstract]    
Less than 12 months $ 4,742 $ 405,209
12 months or more 0 5,048
Total 4,742 410,257
Available for sale, Unrealized Loss [Abstract]    
Less than 12 months 18 4,158
12 months or more 0 41
Total $ 18 4,199
Number of securities with an unrealized loss | Security 2  
U.S. Government and Agencies [Member]    
Available for sale, Fair Value [Abstract]    
Less than 12 months $ 0 0
12 months or more 0 0
Total 0 0
Available for sale, Unrealized Loss [Abstract]    
Less than 12 months 0 0
12 months or more 0 0
Total 0 0
State and Municipal [Member]    
Available for sale, Fair Value [Abstract]    
Less than 12 months 4,742 58,389
12 months or more 0 387
Total 4,742 58,776
Available for sale, Unrealized Loss [Abstract]    
Less than 12 months 18 910
12 months or more 0 1
Total 18 911
Mortgage-backed Securities [Member]    
Available for sale, Fair Value [Abstract]    
Less than 12 months 0 284,120
12 months or more 0 4,661
Total 0 288,781
Available for sale, Unrealized Loss [Abstract]    
Less than 12 months 0 3,070
12 months or more 0 40
Total 0 3,110
Collateralized Mortgage Obligations [Member]    
Available for sale, Fair Value [Abstract]    
Less than 12 months 0 60,039
12 months or more 0 0
Total 0 60,039
Available for sale, Unrealized Loss [Abstract]    
Less than 12 months 0 169
12 months or more 0 0
Total 0 169
Asset-backed and Other Amortizing Securities [Member]    
Available for sale, Fair Value [Abstract]    
Less than 12 months 0 2,661
12 months or more 0 0
Total 0 2,661
Available for sale, Unrealized Loss [Abstract]    
Less than 12 months 0 9
12 months or more 0 0
Total $ 0 $ 9