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Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Cash and due from banks	$ 94,157	$ 77,253
Cash at Federal Reserve and other banks	515,365	592,298
Amortized cost, held to maturity	260,454	284,563
Financial liabilities:
Other borrowings	36,226	26,914
Junior subordinated debt	57,742	57,635
Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Contract amount, Off-balance sheet	122,965	110,813
Level 3 | Standby letters of credit
Off-balance sheet:
Contract amount, Off-balance sheet	14,543	15,056
Level 3 | Commitments
Off-balance sheet:
Contract amount, Off-balance sheet	1,476,847	1,426,827
Carrying Amount | Level 1
Financial assets:
Cash and due from banks	94,157	77,253
Cash at Federal Reserve and other banks	515,365	592,298
Carrying Amount | Level 2
Financial assets:
Amortized cost, held to maturity	260,454	284,563
Restricted equity securities	17,250	17,250
Financial liabilities:
Deposits	6,863,400	6,505,934
Other borrowings	36,266	26,914
Carrying Amount | Level 3
Financial assets:
Loans, net	4,881,036	4,671,280
Financial liabilities:
Junior subordinated debt	57,742	57,635
Fair Value | Level 1
Financial assets:
Cash and due from banks	94,157	77,253
Cash at Federal Reserve and other banks	515,365	592,298
Fair Value | Level 2
Financial assets:
Amortized cost, held to maturity	271,439	298,726
Financial liabilities:
Deposits	6,870,196	6,507,235
Other borrowings	36,266	26,914
Fair Value | Level 3
Financial assets:
Loans, net	4,885,946	4,753,027
Financial liabilities:
Junior subordinated debt	57,685	56,632
Fair Value | Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Fair value, Off-balance sheet	1,229	1,108
Fair Value | Level 3 | Standby letters of credit
Off-balance sheet:
Fair value, Off-balance sheet	145	151
Fair Value | Level 3 | Commitments
Off-balance sheet:
Fair value, Off-balance sheet	$ 14,768	$ 14,268

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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.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Amount of restricted investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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