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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 558,786 | $ 513,602
Gross Unrealized Gains | 176 | 2,502
Gross Unrealized Losses | (16,657) | (6,439)
Available-for-sale Securities, Fair Value | 542,305 | 509,665
Held-to-maturity, Amortized Cost | 223,848 | 200,448
Held-to-maturity, Gross Unrealized Gains | 1,092 | 3,726
Held-to-maturity, Gross Unrealized Losses | (5,782) | (3,089)
Held-to-maturity, Fair Value | 219,158 | 201,085
State and Municipal [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 159,812 | 148,045
Gross Unrealized Gains | 57 | 2,189
Gross Unrealized Losses | (3,194) | (670)
Available-for-sale Securities, Fair Value | 156,675 | 149,564
Held-to-maturity, Amortized Cost | 204,619 | 179,836
Held-to-maturity, Gross Unrealized Gains | 1,062 | 3,493
Held-to-maturity, Gross Unrealized Losses | (5,257) | (2,932)
Held-to-maturity, Fair Value | 200,424 | 180,397
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 178,069 | 132,871
Gross Unrealized Gains |  | 45
Gross Unrealized Losses | (5,398) | (2,551)
Available-for-sale Securities, Fair Value | 172,671 | 130,365
Held-to-maturity, Amortized Cost | 5,262 | 5,734
Held-to-maturity, Gross Unrealized Gains | 3 | 17
Held-to-maturity, Gross Unrealized Losses | (182) | (69)
Held-to-maturity, Fair Value | 5,083 | 5,682
Federal Agency Mortgage-backed Pools [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 193,461 | 211,487
Gross Unrealized Gains | 16 | 155
Gross Unrealized Losses | (7,502) | (2,985)
Available-for-sale Securities, Fair Value | 185,975 | 208,657
Held-to-maturity, Amortized Cost | 13,967 | 14,878
Held-to-maturity, Gross Unrealized Gains | 27 | 216
Held-to-maturity, Gross Unrealized Losses | (343) | (88)
Held-to-maturity, Fair Value | 13,651 | 15,006
U.S. Treasury and Federal Agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 17,036 | 19,277
Gross Unrealized Losses | (464) | (225)
Available-for-sale Securities, Fair Value | 16,572 | 19,052
Private Labeled Mortgage-backed Pools [Member] |  |
Debt Securities, Available-for-sale [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] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 10,408 | 272
Gross Unrealized Gains | 103 | 113
Gross Unrealized Losses | (99) |
Available-for-sale Securities, Fair Value | $ 10,412 | $ 385

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