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Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Payment to be made on pro rata basis.

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Percentage of variation in assumptions.

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Purchase price of trust preferred securities expressed as a percentage of its par value.

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Cash Flows between a transferor and a transferee attributable to collections reinvested in revolving period transfers related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The increase (decrease) during the reporting period in the value of loans or securitized loans that are held with the intention to sell in the near future.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		12 Months Ended
	Feb. 16, 2011	Sep. 30, 2004	Apr. 30, 2004	Sep. 30, 2020	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Servicing Liabilities At Fair Value [Line Items]
Gain on early extinguishment of debt						$ 94	$ 0	$ 2,316
Servicing Asset at Amortized Cost						33,071	26,762	$ 27,428	$ 25,255
Servicing Asset At Fair Value Amount						$ 40,294	$ 31,027
Weighted-average yield						1.28%	2.52%
Percentage Of Variation In Assumptions						10.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Qualitative Information						These sensitivities are hypothetical and should be used with caution. As the figures indicate, changes in fair value based on a 10% variation in assumptions generally cannot be extrapolated because the relationship between the change in assumption and the change in fair value may not be linear. Also, in this table, the effect of a variation in a particular assumption on the fair value of the MSR is calculated without changing any other assumption; in reality, changes in one factor may result in changes in another (for example, increases in market interest rates may result in lower prepayments), which may magnify or counteract the sensitivities
Debt Securities, Available-for-sale, Allowance for Credit Loss						$ 1,310	$ 0
Commercial Portfolio Segment [Member] \| Nonperforming Financial Instruments [Member]
Servicing Liabilities At Fair Value [Line Items]
Cash realized on sale of loan							$ 11,400
Minimum [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage Of Variation In Assumptions						10.00%
Maximum [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage Of Variation In Assumptions						20.00%
FirstBank [Member]
Servicing Liabilities At Fair Value [Line Items]
Payment To Be Made On Pro Rata Basis						65.00%
Prlp [Member]
Servicing Liabilities At Fair Value [Line Items]
Payment To Be Made On Pro Rata Basis						35.00%
Prlp [Member] \| Minimum [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage Of Priority Interest To Be Received On Invested Capital						12.00%
CPG/GS [Member]
Servicing Liabilities At Fair Value [Line Items]
Loans and Leases Receivable, Gross	$ 136,100
CPG/GS [Member] \| Commercial Portfolio Segment [Member]
Servicing Liabilities At Fair Value [Line Items]
Loans held for sale sold	269,300
CPG/GS [Member] \| Commercial Portfolio Segment [Member] \| Nonperforming Financial Instruments [Member]
Servicing Liabilities At Fair Value [Line Items]
Cash realized on sale of loan	$ 88,500
CPG/GS [Member] \| FirstBank [Member] \| Commercial Portfolio Segment [Member] \| Nonperforming Financial Instruments [Member]
Servicing Liabilities At Fair Value [Line Items]
Acquired equity interest	35.00%
Statutory Trust One [Member]
Servicing Liabilities At Fair Value [Line Items]
Trust preferred securities repurchased				$ 400	$ 23,800
Trust Preferred Purchase Price Percent				75.00%
Trust Preferred Securties Discount				25.00%	10.00%
Gain on early extinguishment of debt				$ 100	$ 2,300
Trust Preferred Securities Winning Bid					90.00%
Variable Rate Demand Obligation [Member] \| Junior Subordinated Debt [Member]
Servicing Liabilities At Fair Value [Line Items]
Debt Instrument, Maturity Date, Description						The Junior Subordinated Deferrable Debentures issued by the Corporation in April 2004 and September 2004 mature on June 17, 2034 and September 20, 2034, respectively; however, under certain circumstances, the maturity of Junior Subordinated Deferrable Debentures may be shortened (such shortening would result in a mandatory redemption of the variable-rate TRuPs).
Variable Rate Demand Obligation [Member] \| Statutory Trust One [Member]
Servicing Liabilities At Fair Value [Line Items]
Proceeds from Issuance of Trust Preferred Securities			$ 100,000
Proceeds of the issuance, together with proceeds of the purchase			3,100
Principal amount of corporation's junior subordinated deferrable debentures			$ 103,100
Variable Rate Demand Obligation [Member] \| Statutory Trust Two [Member]
Servicing Liabilities At Fair Value [Line Items]
Proceeds from Issuance of Trust Preferred Securities		$ 125,000
Proceeds of the issuance, together with proceeds of the purchase		3,900
Principal amount of corporation's junior subordinated deferrable debentures		$ 128,900
MBS [Member]
Servicing Liabilities At Fair Value [Line Items]
Weighted-average yield						1.47%	2.60%
Debt Securities, Available-for-sale, Allowance for Credit Loss						$ 1,002
MBS [Member] \| Private label [Member]
Servicing Liabilities At Fair Value [Line Items]
Servicing Asset at Amortized Cost						12,300
Servicing Asset At Fair Value Amount						$ 8,400
Weighted-average yield						2.25%
Debt Securities, Available-for-sale, Allowance for Credit Loss						$ 1,002	$ 0
MBS [Member] \| Private label [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Servicing Liabilities At Fair Value [Line Items]
Debt Instrument Description Of Variable Rate Basis						90-day LIBOR
GNMA [Member]
Servicing Liabilities At Fair Value [Line Items]
Principal amount of corporation serviced loans securitized through GNMA						$ 2,100,000