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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 389,267
Fair Value	394,178
Equity securities, Amortized Cost	50
Equity securities, Fair Value	73
Available for sale securities, Total	389,317	$ 373,775
Available for sale securities, Gross Unrealized Gains	5,593	4,354
Available for sale securities, Gross Unrealized Losses	659	1,930
Securities available for sale	394,251	376,199
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	389,267	373,725
Gross Unrealized Gains	5,570	4,337
Gross Unrealized Losses	659	1,930
Fair Value	394,178	376,132
Debt Securities | U.S. Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,826	23,910
Gross Unrealized Gains	265	71
Gross Unrealized Losses	81	23
Fair Value	49,010	23,958
Debt Securities | States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	123,136	52,578
Gross Unrealized Gains	2,184	819
Gross Unrealized Losses	507	996
Fair Value	124,813	52,401
Debt Securities | U.S. Government Sponsored Enterprises (GSE) residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	135,498	174,220
Gross Unrealized Gains	1,457	1,573
Gross Unrealized Losses	10	197
Fair Value	136,945	175,596
Debt Securities | GSE residential collateralized mortgage obligations (CMOs)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,973	57,976
Gross Unrealized Gains	238	857
Gross Unrealized Losses	39	128
Fair Value	18,172	58,705
Debt Securities | GSE commercial CMOs
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,834	65,041
Gross Unrealized Gains	1,426	1,017
Gross Unrealized Losses	22	586
Fair Value	65,238	65,472
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Equity securities, Amortized Cost	50	50
Equity securities, Gross Unrealized Gains	23	17
Equity securities, Gross Unrealized Losses	0	0
Equity securities, Fair Value	$ 73	$ 67

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