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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financial assets: |  |
Cash and due from banks | $ 136,474 | $ 153,826
Securities available for sale | 565,529 | 578,804
Accrued interest receivable | 12,940 | 12,770
Financial liabilities: |  |
Noninterest-bearing deposits | 1,350,383 | 1,312,274
Interest-bearing deposits | 3,076,152 | 3,036,380
Accrued interest payable | 5,775 | 5,309
Carrying Amount [Member] |  |
Financial assets: |  |
Cash and due from banks | 136,474 | 153,826
Securities available for sale | 565,529 | 578,804
Loans and leases receivable, net of allowance for loan and lease losses | 4,510,308 | 4,273,415
Loans held for sale | 5,349 | 6,394
Accrued interest receivable | 12,940 | 12,770
FHLB stock | 16,385 | 16,385
Financial liabilities: |  |
Noninterest-bearing deposits | 1,350,383 | 1,312,274
Interest-bearing deposits | 3,076,152 | 3,036,380
Borrowings and subordinated debentures | 387,532 | 267,270
Accrued interest payable | 5,775 | 5,309
Off-balance sheet items: |  |
Commitments to extend credit | 354,894 | 318,634
Carrying Amount [Member] | Standby letters of credit [Member] |  |
Off-balance sheet items: |  |
Letters of credit | 24,702 | 19,294
Carrying Amount [Member] | Commercial letters of credit [Member] |  |
Off-balance sheet items: |  |
Letters of credit | 15,377 | 9,308
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member] |  |
Financial assets: |  |
Cash and due from banks | 136,474 | 153,826
Securities available for sale |  | 22,538
Loans and leases receivable, net of allowance for loan and lease losses | 0 | 0
Loans held for sale | 0 | 0
Accrued interest receivable | 12,940 | 12,770
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 | 5,775 | 5,309
Off-balance sheet items: |  |
Commitments to extend credit | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member] | Standby letters of credit [Member] |  |
Off-balance sheet items: |  |
Letters of credit | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member] | Commercial letters of credit [Member] |  |
Off-balance sheet items: |  |
Letters of credit | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member] |  |
Financial assets: |  |
Cash and due from banks | 0 | 0
Securities available for sale |  | 556,266
Loans and leases receivable, net of allowance for loan and lease losses | 0 | 0
Loans held for sale | 6,451 | 6,394
Accrued interest receivable | 0 | 0
FHLB stock | 16,385 | 16,385
Financial liabilities: |  |
Noninterest-bearing deposits | 1,350,383 | 1,312,274
Interest-bearing deposits | 0 | 0
Borrowings and subordinated debentures | 94,864 | 0
Accrued interest payable | 0 | 0
Off-balance sheet items: |  |
Commitments to extend credit | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member] | Standby letters of credit [Member] |  |
Off-balance sheet items: |  |
Letters of credit | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member] | Commercial letters of credit [Member] |  |
Off-balance sheet items: |  |
Letters of credit | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member] |  |
Financial assets: |  |
Cash and due from banks | 0 | 0
Securities available for sale |  | 0
Loans and leases receivable, net of allowance for loan and lease losses | 4,453,997 | 4,213,689
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 | 3,070,237 | 2,973,139
Borrowings and subordinated debentures | 269,762 | 267,270
Accrued interest payable | 0 | 0
Off-balance sheet items: |  |
Commitments to extend credit | 354,894 | 318,634
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member] | Standby letters of credit [Member] |  |
Off-balance sheet items: |  |
Letters of credit | 24,702 | 19,294
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member] | Commercial letters of credit [Member] |  |
Off-balance sheet items: |  |
Letters of credit | $ 15,377 | $ 9,308

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