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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Additional Information (Detail)		3 Months Ended
	Dec. 31, 2018 USD ($) Commitment Loan	Mar. 31, 2019 USD ($) Allowance Loan	Mar. 31, 2018 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Loans held for sale, average life from purchase to sale		20 days
Number of Loans | Loan		12	9
Recorded Investment		$ 899,000	$ 322,000
Funds for reimbursement	$ 500,000	500,000
Loans reported as TDR	$ 19,200,000	$ 19,600,000
Minimum performance requirement		9 months
Number of loans modified as TDR (loan) | Loan		6	1
Number of commitments to lend additional funds (commitment) | Commitment	0
Loans modified as TDR		$ 568,000	$ 29,000
Loans modified as TDR allowance (allowance) | Allowance		0
Loans and leases receivable, net of allowance for loan and lease losses	$ 8,503,522,000	$ 8,700,565,000
Proceeds from sales of loans		0	16,468,000
Purchase of loans		129,289,000	0
Gain (loss) on sale of SBA and other loans		$ 0	$ 1,361,000
Purchase price as a percentage of loans outstanding		97.60%
Loans pledged as collateral		$ 5,400,000,000
Residential real estate
Financing Receivable, Modifications [Line Items]
Residential real estate held in other real estate owned	200,000	400,000
Loans in process of foreclosure	$ 2,100,000	$ 1,400,000
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDR (loan) | Loan	1
Loans modified as TDR	$ 1,500,000
Forgiveness of debt
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan		0	0
Recorded Investment		$ 0	$ 0

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Loans Held-for-investment, Purchase Price as a Percentage of Loans Outstanding

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Loans Receivables Gross Troubled Debt Restructurings

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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