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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 513,602 | $ 445,839
Gross Unrealized Gains | 2,502 | 922
Gross Unrealized Losses | (6,439) | (6,929)
Available-for-sale Securities, Fair Value | 509,665 | 439,831
Held-to-maturity, Amortized Cost | 200,448 | 193,194
Held-to-maturity, Gross Unrealized Gains | 3,726 | 3,628
Held-to-maturity, Gross Unrealized Losses | (3,089) | (2,736)
Held-to-maturity, Fair Value | 201,085 | 194,086
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 148,045 | 117,327
Gross Unrealized Gains | 2,189 | 324
Gross Unrealized Losses | (670) | (1,059)
Available-for-sale Securities, Fair Value | 149,564 | 116,592
Held-to-maturity, Amortized Cost | 179,836 | 165,607
Held-to-maturity, Gross Unrealized Gains | 3,493 | 2,700
Held-to-maturity, Gross Unrealized Losses | (2,932) | (2,485)
Held-to-maturity, Fair Value | 180,397 | 165,822
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 132,871 | 139,040
Gross Unrealized Gains | 45 | 254
Gross Unrealized Losses | (2,551) | (2,099)
Available-for-sale Securities, Fair Value | 130,365 | 137,195
Held-to-maturity, Amortized Cost | 5,734 | 6,530
Held-to-maturity, Gross Unrealized Gains | 17 | 31
Held-to-maturity, Gross Unrealized Losses | (69) | (71)
Held-to-maturity, Fair Value | 5,682 | 6,490
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 211,487 | 180,183
Gross Unrealized Gains | 155 | 251
Gross Unrealized Losses | (2,985) | (3,707)
Available-for-sale Securities, Fair Value | 208,657 | 176,726
Held-to-maturity, Amortized Cost | 14,878 | 21,057
Held-to-maturity, Gross Unrealized Gains | 216 | 897
Held-to-maturity, Gross Unrealized Losses | (88) | (180)
Held-to-maturity, Fair Value | 15,006 | 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 | 19,277 | 8,051
Gross Unrealized Gains |  | 2
Gross Unrealized Losses | (225) | (64)
Available-for-sale Securities, Fair Value | 19,052 | 7,989
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,650 |
Gross Unrealized Losses | (8) |
Available-for-sale Securities, Fair Value | 1,642 |
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 272 | 1,238
Gross Unrealized Gains | 113 | 91
Available-for-sale Securities, Fair Value | $ 385 | $ 1,329

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