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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets: |  |
Cash and due from banks | $ 153,826 | $ 147,235
Securities available for sale | 578,804 | 516,964
Accrued interest receivable | 12,770 | 10,987
Financial liabilities: |  |
Noninterest-bearing deposits | 1,312,274 | 1,203,240
Interest-bearing deposits | 3,036,380 | 2,606,497
Accrued interest payable | 5,309 | 2,567
U.S. government agency securities [Member] |  |
Financial assets: |  |
Securities available for sale | 7,414 | 7,441
Other securities [Member] |  |
Financial assets: |  |
Securities available for sale | 22,386 | 22,394
Carrying Amount [Member] |  |
Financial assets: |  |
Cash and due from banks | 153,826 | 147,235
Securities available for sale | 578,804 | 516,964
Loans and leases receivable, net of allowance for loan and lease losses | 4,273,415 | 3,812,340
Loans held for sale | 6,394 | 9,316
Accrued interest receivable | 12,770 | 10,987
FHLB stock | 16,385 | 16,385
Financial liabilities: |  |
Noninterest-bearing deposits | 1,312,274 | 1,203,240
Interest-bearing deposits | 3,036,380 | 2,606,497
Borrowings | 267,270 | 333,978
Accrued interest payable | 5,309 | 2,567
Off-balance sheet items: |  |
Commitments to extend credit | 318,634 | 310,987
Standby letters of credit | 19,294 | 15,669
Commercial letters of credit | 9,308 | 4,215
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets [Member] |  |
Financial assets: |  |
Cash and due from banks | 153,826 | 147,235
Securities available for sale | 22,538 | 22,550
Loans and leases receivable, net of allowance for loan and lease losses | 0 | 0
Loans held for sale | 0 | 0
Accrued interest receivable | 12,770 | 10,987
FHLB stock | 0 | 0
Financial liabilities: |  |
Noninterest-bearing deposits | 0 | 0
Interest-bearing deposits | 0 | 0
Borrowings | 0 | 0
Accrued interest payable | 5,309 | 2,567
Off-balance sheet items: |  |
Commitments to extend credit | 0 | 0
Standby letters of credit | 0 | 0
Commercial letters of credit | 0 | 0
Fair Value [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] |  |
Financial assets: |  |
Cash and due from banks | 0 | 0
Securities available for sale | 556,266 | 494,414
Loans and leases receivable, net of allowance for loan and lease losses | 0 | 0
Loans held for sale | 6,394 | 9,316
Accrued interest receivable | 0 | 0
FHLB stock | 16,385 | 16,385
Financial liabilities: |  |
Noninterest-bearing deposits | 1,312,274 | 1,203,240
Interest-bearing deposits | 0 | 0
Borrowings | 0 | 0
Accrued interest payable | 0 | 0
Off-balance sheet items: |  |
Commitments to extend credit | 0 | 0
Standby letters of credit | 0 | 0
Commercial letters of credit | 0 | 0
Fair Value [Member] | Significant Unobservable Inputs [Member] |  |
Financial assets: |  |
Cash and due from banks | 0 | 0
Securities available for sale | 0 | 0
Loans and leases receivable, net of allowance for loan and lease losses | 4,213,689 | 3,789,579
Loans held for sale | 0 | 0
Accrued interest receivable | 0 | 0
FHLB stock | 0 | 0
Financial liabilities: |  |
Noninterest-bearing deposits | 0 | 0
Interest-bearing deposits | 2,973,139 | 2,541,929
Borrowings | 267,270 | 333,978
Accrued interest payable | 0 | 0
Off-balance sheet items: |  |
Commitments to extend credit | 318,634 | 310,987
Standby letters of credit | 19,294 | 15,669
Commercial letters of credit | $ 9,308 | $ 4,215

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