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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 446,558 | $ 444,062
Gross Unrealized Gains | 9,030 | 3,971
Held-to-maturity, Amortized Cost | 173,696 | 187,629
Gross Unrealized Losses | (349) | (3,051)
Held-to-maturity, Gross Unrealized Gains | 8,969 | 6,636
Available-for-sale Securities, Fair Value | 455,239 | 444,982
Held-to-maturity, Gross Unrealized Losses | (2,606) | (562)
Held-to-maturity, Fair Value | 180,059 | 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 | 18,384 | 5,940
Gross Unrealized Gains | 86 | 3
Held-to-maturity, Amortized Cost |  | 5,859
Gross Unrealized Losses |  | (17)
Held-to-maturity, Gross Unrealized Gains |  | 93
Available-for-sale Securities, Fair Value | 18,470 | 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 | 60,961 | 73,829
Gross Unrealized Gains | 1,654 | 1,299
Held-to-maturity, Amortized Cost | 143,093 | 146,331
Gross Unrealized Losses | (4) | (33)
Held-to-maturity, Gross Unrealized Gains | 7,586 | 5,375
Available-for-sale Securities, Fair Value | 62,611 | 75,095
Held-to-maturity, Gross Unrealized Losses | (2,606) | (253)
Held-to-maturity, Fair Value | 148,073 | 151,453
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 151,736 | 157,291
Gross Unrealized Gains | 2,596 | 567
Held-to-maturity, Amortized Cost | 8,424 | 9,051
Gross Unrealized Losses | (69) | (1,655)
Held-to-maturity, Gross Unrealized Gains | 199 | 27
Available-for-sale Securities, Fair Value | 154,263 | 156,203
Held-to-maturity, Gross Unrealized Losses |  | (124)
Held-to-maturity, Fair Value | 8,623 | 8,954
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 215,445 | 206,970
Gross Unrealized Gains | 4,654 | 2,080
Held-to-maturity, Amortized Cost | 22,179 | 26,388
Gross Unrealized Losses | (276) | (1,346)
Held-to-maturity, Gross Unrealized Gains | 1,184 | 1,141
Available-for-sale Securities, Fair Value | 219,823 | 207,704
Held-to-maturity, Gross Unrealized Losses |  | (185)
Held-to-maturity, Fair Value | 23,363 | 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 | 40 | 22
Available-for-sale Securities, Fair Value | $ 72 | $ 54

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