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Borrowings - Schedule of Remaining Borrowing Capacity with FHLB (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 257,359 | $ 227,004
Interest Rate 1.54% and 0.74% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | 34,416 | 103,969
Interest Rate 0.83% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 0 | 15,016
Maturity date | Sep. 06, 2017 |
Interest Rate 1.25% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 0 | 15,093
Maturity date | Dec. 15, 2017 |
Interest Rate 1.05% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 7,550 | 17,523
Maturity date | Sep. 06, 2018 |
Interest Rate 1.66% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 30,000 | 0
Maturity date | Jun. 28, 2019 |
Interest Rate 1.17% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 11,752 | 18,360
Maturity date | Sep. 06, 2019 |
Interest Rate 1.35% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 8,883 | 13,865
Maturity date | Sep. 16, 2019 |
Interest Rate 1.82% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 30,000 | 0
Maturity date | Jun. 29, 2020 |
Interest Rate 1.27% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 13,859 | 18,780
Maturity date | Sep. 08, 2020 |
Interest Rate 1.97% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 30,000 | 0
Maturity date | Jun. 28, 2021 |
Interest Rate 1.97% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 50,000 | 0
Maturity date | Jun. 29, 2022 |
Interest Rate 1.47% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 15,976 | 19,201
Maturity date | Sep. 06, 2022 |
Interest Rate 2.39% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 20,000 | 0
Maturity date | Dec. 05, 2022 |
Interest Rate 4.72% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 700 | 700
Maturity date | Jul. 03, 2023 |
Interest Rate 4.31% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 1,797 | 1,925
Maturity date | Sep. 05, 2023 |
Interest Rate 3.05% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 814 | 852
Maturity date | Mar. 11, 2024 |
Interest Rate 5.24% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 435 | 462
Maturity date | Jun. 11, 2024 |
Interest Rate 3.35% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 217 | 240
Maturity date | May 04, 2026 |
Interest Rate 4.00% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 231 | 252
Maturity date | Oct. 14, 2026 |
Interest Rate 2.96% [Member] |  |
Borrowings Under Repurchase Agreements [Line Items] |  |
Borrowings | $ 729 | $ 766
Maturity date | Feb. 11, 2033 |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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