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SECURITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available for sale:    
Amortized Cost $ 775,903 $ 834,564
Gross Unrealized Gains 306 383
Gross Unrealized Losses (16,293) (15,225)
Estimated Fair Value 759,916 819,722
Held to maturity:    
Held-to-maturity Securities 180,866 223,237
Gross Unrealized Gains 1,293 1,692
Gross Unrealized Losses (2,274) (2,051)
Estimated Fair Value 179,885 222,878
Total securities    
Amortized Cost 956,769 1,057,801
Gross Unrealized Gains 1,599 2,075
Gross Unrealized Losses (18,567) (17,276)
Investments, Fair Value Disclosure 939,801 1,042,600
U.S. GSE securities    
Available for sale:    
Amortized Cost 57,994 64,993
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1,180) (1,344)
Estimated Fair Value 56,814 63,649
State and municipal obligations    
Available for sale:    
Amortized Cost 87,582 117,292
Gross Unrealized Gains 259 212
Gross Unrealized Losses (819) (1,339)
Estimated Fair Value 87,022 116,165
Held to maturity:    
Held-to-maturity Securities 60,762 66,666
Gross Unrealized Gains 972 1,085
Gross Unrealized Losses (64) (130)
Estimated Fair Value 61,670 67,621
U.S. GSE residential mortgage-backed securities    
Available for sale:    
Amortized Cost 189,705 160,446
Gross Unrealized Gains 29 16
Gross Unrealized Losses (2,833) (2,414)
Estimated Fair Value 186,901 158,048
Held to maturity:    
Held-to-maturity Securities 11,424 13,443
Gross Unrealized Gains 0 0
Gross Unrealized Losses (261) (287)
Estimated Fair Value 11,163 13,156
U.S. GSE residential collateralized mortgage Obligations    
Available for sale:    
Amortized Cost 314,390 373,098
Gross Unrealized Gains 16 149
Gross Unrealized Losses (7,016) (5,736)
Estimated Fair Value 307,390 367,511
Held to maturity:    
Held-to-maturity Securities 54,250 61,639
Gross Unrealized Gains 244 352
Gross Unrealized Losses (666) (552)
Estimated Fair Value 53,828 61,439
U.S. GSE commercial mortgage-backed securities    
Available for sale:    
Amortized Cost 6,017 6,337
Gross Unrealized Gains 2 6
Gross Unrealized Losses (40) (36)
Estimated Fair Value 5,979 6,307
Held to maturity:    
Held-to-maturity Securities 22,953 28,772
Gross Unrealized Gains 77 136
Gross Unrealized Losses (438) (509)
Estimated Fair Value 22,592 28,399
U.S. GSE commercial collateralized mortgage Obligations    
Available for sale:    
Amortized Cost 49,965 56,148
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1,249) (956)
Estimated Fair Value 48,716 55,192
Held to maturity:    
Held-to-maturity Securities 31,477 41,717
Gross Unrealized Gains 0 93
Gross Unrealized Losses (845) (573)
Estimated Fair Value 30,632 41,237
Other asset backed securities    
Available for sale:    
Amortized Cost 24,250 24,250
Gross Unrealized Gains 0 0
Gross Unrealized Losses (849) (1,697)
Estimated Fair Value 23,401 22,553
Corporate bonds    
Available for sale:    
Amortized Cost 46,000 32,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2,307) (1,703)
Estimated Fair Value 43,693 30,297
Held to maturity:    
Held-to-maturity Securities 0 11,000
Gross Unrealized Gains 0 26
Gross Unrealized Losses 0 0
Estimated Fair Value $ 0 $ 11,026