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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 477,670 | $ 445,839
Gross Unrealized Gains | 2,712 | 922
Held-to-maturity, Amortized Cost | 198,868 | 193,194
Gross Unrealized Losses | (6,160) | (6,929)
Held-to-maturity, Gross Unrealized Gains | 3,796 | 3,628
Available-for-sale Securities, Fair Value | 474,222 | 439,831
Held-to-maturity, Gross Unrealized Losses | (2,182) | (2,736)
Held-to-maturity, Fair Value | 200,482 | 194,086
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 13,546 | 8,051
Gross Unrealized Gains | 2 | 2
Gross Unrealized Losses | (68) | (64)
Available-for-sale Securities, Fair Value | 13,480 | 7,989
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 127,108 | 117,327
Gross Unrealized Gains | 656 | 324
Held-to-maturity, Amortized Cost | 176,631 | 165,607
Gross Unrealized Losses | (659) | (1,059)
Held-to-maturity, Gross Unrealized Gains | 3,317 | 2,700
Available-for-sale Securities, Fair Value | 127,105 | 116,592
Held-to-maturity, Gross Unrealized Losses | (1,948) | (2,485)
Held-to-maturity, Fair Value | 178,000 | 165,822
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 137,815 | 139,040
Gross Unrealized Gains | 241 | 254
Held-to-maturity, Amortized Cost | 6,297 | 6,530
Gross Unrealized Losses | (1,867) | (2,099)
Held-to-maturity, Gross Unrealized Gains | 30 | 31
Available-for-sale Securities, Fair Value | 136,189 | 137,195
Held-to-maturity, Gross Unrealized Losses | (65) | (71)
Held-to-maturity, Fair Value | 6,262 | 6,490
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 196,064 | 180,183
Gross Unrealized Gains | 1,194 | 251
Held-to-maturity, Amortized Cost | 15,940 | 21,057
Gross Unrealized Losses | (3,547) | (3,707)
Held-to-maturity, Gross Unrealized Gains | 449 | 897
Available-for-sale Securities, Fair Value | 193,711 | 176,726
Held-to-maturity, Gross Unrealized Losses | (169) | (180)
Held-to-maturity, Fair Value | 16,220 | 21,774
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,901 |
Gross Unrealized Losses | (19) |
Available-for-sale Securities, Fair Value | 1,882 |
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,236 | 1,238
Gross Unrealized Gains | 619 | 91
Available-for-sale Securities, Fair Value | $ 1,855 | $ 1,329

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