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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 510,445 | $ 445,839
Gross Unrealized Gains | 3,036 | 922
Gross Unrealized Losses | (3,637) | (6,929)
Available for sale Securities, Fair Value | 509,844 | 439,831
Held to maturity, Amortized Cost | 198,605 | 193,194
Held to maturity, Gross Unrealized Gains | 4,581 | 3,628
Held to maturity, Gross Unrealized Losses | (964) | (2,736)
Held to maturity, Fair Value | 202,222 | 194,086
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 141,751 | 117,327
Gross Unrealized Gains | 2,288 | 324
Gross Unrealized Losses | (556) | (1,059)
Available for sale Securities, Fair Value | 143,483 | 116,592
Held to maturity, Amortized Cost | 177,473 | 165,607
Held to maturity, Gross Unrealized Gains | 4,249 | 2,700
Held to maturity, Gross Unrealized Losses | (862) | (2,485)
Held to maturity, Fair Value | 180,860 | 165,822
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 135,511 | 139,040
Gross Unrealized Gains | 131 | 254
Gross Unrealized Losses | (1,440) | (2,099)
Available for sale Securities, Fair Value | 134,202 | 137,195
Held to maturity, Amortized Cost | 5,902 | 6,530
Held to maturity, Gross Unrealized Gains | 25 | 31
Held to maturity, Gross Unrealized Losses | (31) | (71)
Held to maturity, Fair Value | 5,896 | 6,490
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 213,071 | 180,183
Gross Unrealized Gains | 496 | 251
Gross Unrealized Losses | (1,516) | (3,707)
Available for sale Securities, Fair Value | 212,051 | 176,726
Held to maturity, Amortized Cost | 15,230 | 21,057
Held to maturity, Gross Unrealized Gains | 307 | 897
Held to maturity, Gross Unrealized Losses | (71) | (180)
Held to maturity, Fair Value | 15,466 | 21,774
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 17,996 | 8,051
Gross Unrealized Gains | 3 | 2
Gross Unrealized Losses | (114) | (64)
Available for sale Securities, Fair Value | 17,885 | 7,989
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,841 |
Gross Unrealized Losses | (11) |
Available for sale Securities, Fair Value | 1,830 |
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 275 | 1,238
Gross Unrealized Gains | 118 | 91
Available for sale Securities, Fair Value | $ 393 | $ 1,329

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