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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, 2016	Dec. 31, 2015
Amortized Cost
Total debt securities	$ 367,070
Equity securities	50
Totals	367,120	$ 392,279
Gross Unrealized Gains
Totals	9,904	3,885
Gross Unrealized Losses
Totals	2,122	2,040
Fair Value
Total debt securities	374,824
Equity securities	78
Totals	374,902	394,124
Debt Securities
Amortized Cost
Total debt securities	367,070	392,229
Gross Unrealized Gains
Total debt securities	9,876	3,862
Gross Unrealized Losses
Total debt securities	2,122	2,040
Fair Value
Total debt securities	374,824	394,051
Debt Securities | U.S. Government Agencies
Amortized Cost
Total debt securities	41,748	47,209
Gross Unrealized Gains
Total debt securities	203	200
Gross Unrealized Losses
Total debt securities	82	182
Fair Value
Total debt securities	41,869	47,227
Debt Securities | States and political subdivisions
Amortized Cost
Total debt securities	123,698	124,421
Gross Unrealized Gains
Total debt securities	6,903	2,483
Gross Unrealized Losses
Total debt securities	202	943
Fair Value
Total debt securities	130,399	125,961
Debt Securities | U.S. Government Sponsored Enterprises (GSE) residential mortgage-backed securities
Amortized Cost
Total debt securities	121,489	132,389
Gross Unrealized Gains
Total debt securities	2,392	229
Gross Unrealized Losses
Total debt securities	0	269
Fair Value
Total debt securities	123,881	132,349
Debt Securities | GSE residential collateralized mortgage obligations (CMOs)
Amortized Cost
Total debt securities	74,106	15,668
Gross Unrealized Gains
Total debt securities	378	215
Gross Unrealized Losses
Total debt securities	1,786	40
Fair Value
Total debt securities	72,698	15,843
Debt Securities | GSE commercial CMOs
Amortized Cost
Total debt securities		63,598
Gross Unrealized Gains
Total debt securities		735
Gross Unrealized Losses
Total debt securities		563
Fair Value
Total debt securities		63,770
Debt Securities | Private label CMOs
Amortized Cost
Total debt securities	6,029	8,944
Gross Unrealized Gains
Total debt securities	0	0
Gross Unrealized Losses
Total debt securities	52	43
Fair Value
Total debt securities	5,977	8,901
Equity Securities
Amortized Cost
Equity securities	50	50
Gross Unrealized Gains
Equity securities	28	23
Gross Unrealized Losses
Equity securities	0	0
Fair Value
Equity securities	$ 78	$ 73

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