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SECURITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available for sale:    
Amortized Cost $ 846,623 $ 834,564
Gross Unrealized Gains 972 383
Gross Unrealized Losses (11,603) (15,225)
Estimated Fair Value 835,992 819,722
Held to maturity:    
Amortized Cost 203,907 223,237
Gross Unrealized Gains 2,192 1,692
Gross Unrealized Losses (1,523) (2,051)
Estimated Fair Value 204,576 222,878
Total securities    
Amortized Cost 1,050,530 1,057,801
Gross Unrealized Gains 3,164 2,075
Gross Unrealized Losses (13,126) (17,276)
Total securities 1,040,568 1,042,600
U.S. GSE securities    
Available for sale:    
Amortized Cost 64,993 64,993
Gross Unrealized Gains
Gross Unrealized Losses (880) (1,344)
Estimated Fair Value 64,113 63,649
State and municipal obligations    
Available for sale:    
Amortized Cost 120,835 117,292
Gross Unrealized Gains 761 212
Gross Unrealized Losses (566) (1,339)
Estimated Fair Value 121,030 116,165
Held to maturity:    
Amortized Cost 59,864 66,666
Gross Unrealized Gains 1,590 1,085
Gross Unrealized Losses (24) (130)
Estimated Fair Value 61,430 67,621
U.S. GSE residential mortgage-backed securities    
Available for sale:    
Amortized Cost 204,903 160,446
Gross Unrealized Gains 47 16
Gross Unrealized Losses (2,110) (2,414)
Estimated Fair Value 202,840 158,048
Held to maturity:    
Amortized Cost 12,485 13,443
Gross Unrealized Gains
Gross Unrealized Losses (242) (287)
Estimated Fair Value 12,243 13,156
U.S. GSE residential collateralized mortgage obligations    
Available for sale:    
Amortized Cost 340,752 373,098
Gross Unrealized Gains 113 149
Gross Unrealized Losses (4,369) (5,736)
Estimated Fair Value 336,496 367,511
Held to maturity:    
Amortized Cost 57,770 61,639
Gross Unrealized Gains 376 352
Gross Unrealized Losses (366) (552)
Estimated Fair Value 57,780 61,439
U.S. GSE commercial mortgage-backed securities    
Available for sale:    
Amortized Cost 6,256 6,337
Gross Unrealized Gains 51 6
Gross Unrealized Losses (15) (36)
Estimated Fair Value 6,292 6,307
Held to maturity:    
Amortized Cost 28,403 28,772
Gross Unrealized Gains 186 136
Gross Unrealized Losses (339) (509)
Estimated Fair Value 28,250 28,399
U.S. GSE commercial collateralized mortgage obligations    
Available for sale:    
Amortized Cost 52,634 56,148
Gross Unrealized Gains
Gross Unrealized Losses (720) (956)
Estimated Fair Value 51,914 55,192
Held to maturity:    
Amortized Cost 34,385 41,717
Gross Unrealized Gains 23 93
Gross Unrealized Losses (552) (573)
Estimated Fair Value 33,856 41,237
Other asset backed securities    
Available for sale:    
Amortized Cost 24,250 24,250
Gross Unrealized Gains
Gross Unrealized Losses (1,273) (1,697)
Estimated Fair Value 22,977 22,553
Corporate bonds    
Available for sale:    
Amortized Cost 32,000 32,000
Gross Unrealized Gains
Gross Unrealized Losses (1,670) (1,703)
Estimated Fair Value 30,330 30,297
Held to maturity:    
Amortized Cost 11,000 11,000
Gross Unrealized Gains 17 26
Gross Unrealized Losses
Estimated Fair Value $ 11,017 $ 11,026