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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 455,502 | $ 444,062
Gross Unrealized Gains | 7,427 | 3,971
Held-to-maturity, Amortized Cost | 180,291 | 187,629
Gross Unrealized Losses | (453) | (3,051)
Held-to-maturity, Gross Unrealized Gains | 8,038 | 6,636
Available-for-sale Securities, Fair Value | 462,476 | 444,982
Held-to-maturity, Gross Unrealized Losses | (236) | (562)
Held-to-maturity, Fair Value | 188,093 | 193,703
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 15,412 | 5,940
Gross Unrealized Gains | 60 | 3
Held-to-maturity, Amortized Cost |  | 5,859
Gross Unrealized Losses | (2) | (17)
Held-to-maturity, Gross Unrealized Gains |  | 93
Available-for-sale Securities, Fair Value | 15,470 | 5,926
Held-to-maturity, Fair Value |  | 5,952
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 69,204 | 73,829
Gross Unrealized Gains | 1,840 | 1,299
Held-to-maturity, Amortized Cost | 145,520 | 146,331
Gross Unrealized Losses | (2) | (33)
Held-to-maturity, Gross Unrealized Gains | 6,753 | 5,375
Available-for-sale Securities, Fair Value | 71,042 | 75,095
Held-to-maturity, Gross Unrealized Losses | (188) | (253)
Held-to-maturity, Fair Value | 152,085 | 151,453
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 155,687 | 157,291
Gross Unrealized Gains | 1,836 | 567
Held-to-maturity, Amortized Cost | 8,731 | 9,051
Gross Unrealized Losses | (210) | (1,655)
Held-to-maturity, Gross Unrealized Gains | 136 | 27
Available-for-sale Securities, Fair Value | 157,313 | 156,203
Held-to-maturity, Gross Unrealized Losses |  | (124)
Held-to-maturity, Fair Value | 8,867 | 8,954
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 215,167 | 206,970
Gross Unrealized Gains | 3,648 | 2,080
Held-to-maturity, Amortized Cost | 26,040 | 26,388
Gross Unrealized Losses | (239) | (1,346)
Held-to-maturity, Gross Unrealized Gains | 1,149 | 1,141
Available-for-sale Securities, Fair Value | 218,576 | 207,704
Held-to-maturity, Gross Unrealized Losses | (48) | (185)
Held-to-maturity, Fair Value | 27,141 | 27,344
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 32 | 32
Gross Unrealized Gains | 43 | 22
Available-for-sale Securities, Fair Value | $ 75 | $ 54

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