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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 375,239
Fair Value	376,360
Equity securities, Amortized Cost	50
Equity securities, Fair Value	76
Available for sale securities, Total	375,289	$ 373,775
Available for sale securities, Gross Unrealized Gains	3,601	4,354
Available for sale securities, Gross Unrealized Losses	2,454	1,930
Securities available for sale	376,436	376,199
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	375,239	373,725
Gross Unrealized Gains	3,575	4,337
Gross Unrealized Losses	2,454	1,930
Fair Value	376,360	376,132
Debt Securities | U.S. Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	45,615	23,910
Gross Unrealized Gains	171	71
Gross Unrealized Losses	177	23
Fair Value	45,609	23,958
Debt Securities | States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	99,511	52,578
Gross Unrealized Gains	662	819
Gross Unrealized Losses	1,785	996
Fair Value	98,388	52,401
Debt Securities | U.S. Government Sponsored Enterprises (GSE) residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	139,414	174,220
Gross Unrealized Gains	1,573	1,573
Gross Unrealized Losses	22	197
Fair Value	140,965	175,596
Debt Securities | GSE residential collateralized mortgage obligations (CMOs)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,321	57,976
Gross Unrealized Gains	256	857
Gross Unrealized Losses	75	128
Fair Value	21,502	58,705
Debt Securities | GSE commercial CMOs
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	69,378	65,041
Gross Unrealized Gains	913	1,017
Gross Unrealized Losses	395	586
Fair Value	69,896	65,472
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Equity securities, Amortized Cost	50	50
Equity securities, Gross Unrealized Gains	26	17
Equity securities, Gross Unrealized Losses	0	0
Equity securities, Fair Value	$ 76	$ 67

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