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SECURITIES - Held to Maturity Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amortized Cost, Held to maturity:    
Within one year $ 2,404  
One to five years 34,689  
Five to ten years 42,341  
Beyond ten years 80,729  
Total 160,163 $ 180,866
Estimated Fair Value, Held to maturity:    
Within one year 2,394  
One to five years 34,543  
Five to ten years 41,847  
Beyond ten years 78,008  
Estimated Fair Value 156,792 179,885
State and municipal obligations    
Amortized Cost, Held to maturity:    
Within one year 2,404  
One to five years 25,954  
Five to ten years 24,882  
Beyond ten years 300  
Total 53,540 60,762
Estimated Fair Value, Held to maturity:    
Within one year 2,394  
One to five years 25,988  
Five to ten years 24,876  
Beyond ten years 296  
Estimated Fair Value 53,554 61,670
U.S. GSE residential mortgage-backed securities    
Amortized Cost, Held to maturity:    
Within one year 0  
One to five years 0  
Five to ten years 7,333  
Beyond ten years 2,355  
Total 9,688 11,424
Estimated Fair Value, Held to maturity:    
Within one year 0  
One to five years 0  
Five to ten years 7,105  
Beyond ten years 2,247  
Estimated Fair Value 9,352 11,163
U.S. GSE residential collateralized mortgage obligations    
Amortized Cost, Held to maturity:    
Within one year 0  
One to five years 0  
Five to ten years 5,211  
Beyond ten years 43,033  
Total 48,244 54,250
Estimated Fair Value, Held to maturity:    
Within one year 0  
One to five years 0  
Five to ten years 5,123  
Beyond ten years 42,154  
Estimated Fair Value 47,277 53,828
U.S. GSE commercial mortgage-backed securities    
Amortized Cost, Held to maturity:    
Within one year 0  
One to five years 6,048  
Five to ten years 4,915  
Beyond ten years 8,135  
Total 19,098 22,953
Estimated Fair Value, Held to maturity:    
Within one year 0  
One to five years 5,997  
Five to ten years 4,743  
Beyond ten years 7,742  
Estimated Fair Value 18,482 22,592
U.S. GSE commercial collateralized mortgage obligations    
Amortized Cost, Held to maturity:    
Within one year 0  
One to five years 2,687  
Five to ten years 0  
Beyond ten years 26,906  
Total 29,593 31,477
Estimated Fair Value, Held to maturity:    
Within one year 0  
One to five years 2,558  
Five to ten years 0  
Beyond ten years 25,569  
Estimated Fair Value $ 28,127 $ 30,632