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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 539,086 | $ 513,602
Gross Unrealized Gains | 585 | 2,502
Gross Unrealized Losses | (13,476) | (6,439)
Available-for-sale Securities, Fair Value | 526,195 | 509,665
Held-to-maturity, Amortized Cost | 209,767 | 200,448
Held-to-maturity, Gross Unrealized Gains | 1,673 | 3,726
Held-to-maturity, Gross Unrealized Losses | (4,710) | (3,089)
Held-to-maturity, Fair Value | 206,730 | 201,085
State and Municipal [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 136,732 | 148,045
Gross Unrealized Gains | 300 | 2,189
Gross Unrealized Losses | (2,051) | (670)
Available-for-sale Securities, Fair Value | 134,981 | 149,564
Held-to-maturity, Amortized Cost | 190,079 | 179,836
Held-to-maturity, Gross Unrealized Gains | 1,610 | 3,493
Held-to-maturity, Gross Unrealized Losses | (4,309) | (2,932)
Held-to-maturity, Fair Value | 187,380 | 180,397
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 168,382 | 132,871
Gross Unrealized Gains | 112 | 45
Gross Unrealized Losses | (4,360) | (2,551)
Available-for-sale Securities, Fair Value | 164,134 | 130,365
Held-to-maturity, Amortized Cost | 5,409 | 5,734
Held-to-maturity, Gross Unrealized Gains | 8 | 17
Held-to-maturity, Gross Unrealized Losses | (157) | (69)
Held-to-maturity, Fair Value | 5,260 | 5,682
Federal Agency Mortgage-backed Pools [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 203,593 | 211,487
Gross Unrealized Gains | 28 | 155
Gross Unrealized Losses | (6,626) | (2,985)
Available-for-sale Securities, Fair Value | 196,995 | 208,657
Held-to-maturity, Amortized Cost | 14,279 | 14,878
Held-to-maturity, Gross Unrealized Gains | 55 | 216
Held-to-maturity, Gross Unrealized Losses | (244) | (88)
Held-to-maturity, Fair Value | 14,090 | 15,006
U.S. Treasury and Federal Agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 24,654 | 19,277
Gross Unrealized Losses | (435) | (225)
Available-for-sale Securities, Fair Value | 24,219 | 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 | 5,725 | 272
Gross Unrealized Gains | 145 | 113
Gross Unrealized Losses | (4) |
Available-for-sale Securities, Fair Value | $ 5,866 | $ 385

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