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SECURITIES AVAILABLE FOR SALE - Gross Unrealized Losses and Fair Value of Company's Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value $ 136,694 $ 77,404
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 1,630 325
Total temporarily impaired securities, 12 Months or More, Fair Value 19,011 74,814
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 824 1,605
Total temporarily impaired securities, Total, Fair Value 155,705 152,218
Total temporarily impaired securities, Total, Unrealized Losses 2,454 1,930
U.S. Government Agencies    
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 23,313 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 177 0
Total temporarily impaired securities, 12 Months or More, Fair Value 0 9,012
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 0 23
Total temporarily impaired securities, Total, Fair Value 23,313 9,012
Total temporarily impaired securities, Total, Unrealized Losses 177 23
States and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 68,777 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 1,011 0
Total temporarily impaired securities, 12 Months or More, Fair Value 13,994 35,833
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 774 996
Total temporarily impaired securities, Total, Fair Value 82,771 35,833
Total temporarily impaired securities, Total, Unrealized Losses 1,785 996
U.S. Government Sponsored Enterprises (GSE) residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 8,259 65,474
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 22 197
Total temporarily impaired securities, 12 Months or More, Fair Value 0 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 0 0
Total temporarily impaired securities, Total, Fair Value 8,259 65,474
Total temporarily impaired securities, Total, Unrealized Losses 22 197
GSE residential collateralized mortgage obligations (CMOs)    
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 1,807 11,930
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 25 128
Total temporarily impaired securities, 12 Months or More, Fair Value 5,017 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 50 0
Total temporarily impaired securities, Total, Fair Value 6,824 11,930
Total temporarily impaired securities, Total, Unrealized Losses 75 128
GSE commercial CMOs    
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 34,538 0
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 395 0
Total temporarily impaired securities, 12 Months or More, Fair Value 0 29,969
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 0 586
Total temporarily impaired securities, Total, Fair Value 34,538 29,969
Total temporarily impaired securities, Total, Unrealized Losses $ 395 $ 586