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Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Cash and due from banks | $ 69,018 | $ 76,441
Investment securities, held to maturity | 209,767 | 200,448
Loans held for sale | 3,000 | 3,094
Loans (excluding loan level hedges), net | 2,916,508 | 2,824,827
Stock in FHLB | 18,105 | 18,105
Interest receivable | 12,993 | 16,244
Liabilities |  |
Non-interest bearing deposits | 615,018 | 601,805
Interest bearing deposits | 2,401,145 | 2,279,198
Borrowings | 524,846 | 564,157
Subordinated debentures | 37,745 | 37,653
Interest payable | 1,441 | 886
Carrying Amount [Member] |  |
Assets |  |
Cash and due from banks | 69,018 | 76,441
Investment securities, held to maturity | 209,767 | 200,448
Loans held for sale | 3,000 | 3,094
Loans (excluding loan level hedges), net | 2,751,703 | 2,661,026
Stock in FHLB | 18,105 | 18,105
Interest receivable | 12,993 | 16,244
Liabilities |  |
Non-interest bearing deposits | 615,018 | 601,805
Interest bearing deposits | 2,401,145 | 2,279,198
Borrowings | 524,846 | 564,157
Subordinated debentures | 37,745 | 37,653
Interest payable | 1,441 | 886
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Cash and due from banks | 69,018 | 76,441
Liabilities |  |
Non-interest bearing deposits | 615,018 | 601,805
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Investment securities, held to maturity | 206,730 | 201,085
Stock in FHLB | 18,105 | 18,105
Interest receivable | 12,993 | 16,244
Liabilities |  |
Interest bearing deposits | 2,263,817 | 2,156,487
Borrowings | 520,701 | 560,057
Subordinated debentures | 35,682 | 35,994
Interest payable | 1,441 | 886
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets |  |
Loans held for sale | 3,000 | 3,094
Loans (excluding loan level hedges), net | $ 2,585,501 | $ 2,585,879

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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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