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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	Sep. 30, 2020	Dec. 31, 2019
Financial assets:
Cash and due from banks	$ 71,034	$ 92,816
Cash at Federal Reserve and other banks	581,548	183,691
Amortized cost, held to maturity	310,696	375,606
Financial liabilities:
Other borrowings	27,055	18,454
Junior subordinated debt	57,527	57,232
Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Contract amount, Off-balance sheet	110,271	110,402
Level 3 | Standby letters of credit
Off-balance sheet:
Contract amount, Off-balance sheet	11,255	12,014
Level 3 | Commitments
Off-balance sheet:
Contract amount, Off-balance sheet	1,320,988	1,309,326
Carrying Amount | Level 1
Financial assets:
Cash and due from banks	71,034	92,816
Cash at Federal Reserve and other banks	581,548	183,691
Carrying Amount | Level 2
Financial assets:
Amortized cost, held to maturity	310,696	375,606
Restricted equity securities	17,250	17,250
Financial liabilities:
Deposits	6,340,588	5,366,994
Other borrowings	27,055	18,454
Carrying Amount | Level 3
Financial assets:
Loans, net	4,738,763	4,276,750
Financial liabilities:
Junior subordinated debt	57,527	57,232
Fair Value | Level 1
Financial assets:
Cash and due from banks	71,034	92,816
Cash at Federal Reserve and other banks	581,548	183,691
Fair Value | Level 2
Financial assets:
Amortized cost, held to maturity	377,442	381,525
Financial liabilities:
Deposits	6,346,930	5,365,921
Other borrowings	27,055	18,454
Fair Value | Level 3
Financial assets:
Loans, net	4,841,120	4,263,064
Financial liabilities:
Junior subordinated debt	55,348	56,297
Fair Value | Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Fair value, Off-balance sheet	1,103	1,104
Fair Value | Level 3 | Standby letters of credit
Off-balance sheet:
Fair value, Off-balance sheet	113	120
Fair Value | Level 3 | Commitments
Off-balance sheet:
Fair value, Off-balance sheet	$ 13,210	$ 13,093

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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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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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