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Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Cash and due from banks | $ 76,441 | $ 70,832
Investment securities, held to maturity | 200,448 | 193,194
Loans held for sale | 3,094 | 8,087
Loans excluding loan level hedges, net | 2,824,827 | 2,127,894
Stock in FHLB and FRB | 18,105 | 23,932
Interest receivable | 16,244 | 12,713
Liabilities |  |
Non-interest bearing deposits | 601,805 | 496,248
Interest-bearing deposits | 2,279,198 | 1,974,962
Borrowings | 564,157 | 267,489
Subordinated debentures | 37,653 | 37,456
Interest payable | 886 | 472
Carrying Amount [Member] |  |
Assets |  |
Cash and due from banks | 76,441 | 70,832
Investment securities, held to maturity | 200,448 | 193,194
Loans held for sale | 3,094 | 8,087
Loans excluding loan level hedges, net | 2,661,026 | 1,998,804
Stock in FHLB | 18,105 |
Stock in FHLB and FRB |  | 23,932
Interest receivable | 16,244 | 12,713
Liabilities |  |
Non-interest bearing deposits | 601,805 | 496,248
Interest-bearing deposits | 2,279,198 | 1,974,962
Borrowings | 564,157 | 267,489
Subordinated debentures | 37,653 | 37,456
Interest payable | 886 | 472
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Cash and due from banks | 76,441 | 70,832
Liabilities |  |
Non-interest bearing deposits | 601,805 | 496,248
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Investment securities, held to maturity | 201,085 | 194,086
Stock in FHLB | 18,105 |
Stock in FHLB and FRB |  | 23,932
Interest receivable | 16,244 | 12,713
Liabilities |  |
Interest-bearing deposits | 2,156,487 | 1,839,167
Borrowings | 560,057 | 261,141
Subordinated debentures | 35,994 | 36,371
Interest payable | 886 | 472
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets |  |
Loans held for sale | 3,094 | 8,087
Loans excluding loan level hedges, net | $ 2,585,879 | $ 1,965,928

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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