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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial assets: |  |
Cash and due from banks | $ 169,830 | $ 155,376
Securities available for sale | 621,470 | 574,908
Accrued interest receivable | 13,397 | 13,331
Financial liabilities: |  |
Noninterest-bearing deposits | 1,316,114 | 1,284,530
Interest-bearing deposits | 3,504,061 | 3,462,705
Accrued interest payable | 14,437 | 11,379
Carrying Amount |  |
Financial assets: |  |
Cash and due from banks | 169,830 | 155,376
Securities available for sale | 621,470 | 574,908
Loans held for sale | 7,140 | 9,390
Loans and leases receivable, net of allowance for loan and lease losses | 4,542,724 | 4,568,566
Accrued interest receivable | 13,397 | 13,331
FHLB stock | 16,385 | 16,385
Financial liabilities: |  |
Noninterest-bearing deposits | 1,316,114 | 1,284,530
Interest-bearing deposits | 3,504,061 | 3,462,705
Borrowings and subordinated debentures | 117,947 | 172,808
Accrued interest payable | 14,437 | 11,379
Off-balance sheet items: |  |
Commitments to extend credit | 270,051 | 325,100
Carrying Amount | Standby letters of credit |  |
Off-balance sheet items: |  |
Letters of credit | 30,597 | 32,500
Carrying Amount | Commercial letters of credit |  |
Off-balance sheet items: |  |
Letters of credit | 11,920 | 13,848
Quoted Prices in Active Markets for Identical Assets | Fair Value |  |
Financial assets: |  |
Cash and due from banks | 169,830 | 155,376
Securities available for sale |  | 39,830
Loans held for sale | 0 | 0
Loans and leases receivable, net of allowance for loan and lease losses | 0 | 0
Accrued interest receivable | 13,397 | 13,331
FHLB stock | 0 | 0
Financial liabilities: |  |
Noninterest-bearing deposits | 0 | 0
Interest-bearing deposits | 0 | 0
Borrowings and subordinated debentures | 0 | 0
Accrued interest payable | 14,437 | 11,379
Off-balance sheet items: |  |
Commitments to extend credit | 0 | 0
Quoted Prices in Active Markets for Identical Assets | Fair Value | Standby letters of credit |  |
Off-balance sheet items: |  |
Letters of credit | 0 | 0
Quoted Prices in Active Markets for Identical Assets | Fair Value | Commercial letters of credit |  |
Off-balance sheet items: |  |
Letters of credit | 0 | 0
Significant Observable Inputs with No Active Market with Identical Characteristics | Fair Value |  |
Financial assets: |  |
Cash and due from banks | 0 | 0
Securities available for sale |  | 535,078
Loans held for sale | 7,576 | 9,905
Loans and leases receivable, net of allowance for loan and lease losses | 0 | 0
Accrued interest receivable | 0 | 0
FHLB stock | 16,385 | 16,385
Financial liabilities: |  |
Noninterest-bearing deposits | 1,316,114 | 1,284,530
Interest-bearing deposits | 0 | 0
Borrowings and subordinated debentures | 117,459 | 98,020
Accrued interest payable | 0 | 0
Off-balance sheet items: |  |
Commitments to extend credit | 0 | 0
Significant Observable Inputs with No Active Market with Identical Characteristics | Fair Value | Standby letters of credit |  |
Off-balance sheet items: |  |
Letters of credit | 0 | 0
Significant Observable Inputs with No Active Market with Identical Characteristics | Fair Value | Commercial letters of credit |  |
Off-balance sheet items: |  |
Letters of credit | 0 | 0
Significant Unobservable Inputs | Fair Value |  |
Financial assets: |  |
Cash and due from banks | 0 | 0
Securities available for sale |  | 0
Loans held for sale | 0 | 0
Loans and leases receivable, net of allowance for loan and lease losses | 4,522,306 | 4,518,716
Accrued interest receivable | 0 | 0
FHLB stock | 0 | 0
Financial liabilities: |  |
Noninterest-bearing deposits | 0 | 0
Interest-bearing deposits | 3,514,296 | 3,458,523
Borrowings and subordinated debentures | 0 | 54,939
Accrued interest payable | 0 | 0
Off-balance sheet items: |  |
Commitments to extend credit | 270,051 | 325,100
Significant Unobservable Inputs | Fair Value | Standby letters of credit |  |
Off-balance sheet items: |  |
Letters of credit | 30,597 | 32,500
Significant Unobservable Inputs | Fair Value | Commercial letters of credit |  |
Off-balance sheet items: |  |
Letters of credit | $ 11,920 | $ 13,848

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