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Derivative Financial Instruments (Schedule of Notional Amounts and Estimated Fair Values of Interest Rate Derivative Contracts Outstanding) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | $ 2,545 | $ 10,941
Estimated Fair Value | 6 | 207
Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 6,000 | 3,885
Estimated Fair Value | (138) | (199)
Not Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 122,788 | 496,887
Estimated Fair Value | 67 | 2,384
Not Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 1,002,860 | 691,143
Estimated Fair Value | (19,483) | (8,921)
Not Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Caps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 107,835 | 122,791
Estimated Fair Value | 266 | 509
Not Designated as Hedging Instrument [Member] | Customer Counterparties Loan Lease Interest Rate Swaps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 1,002,860 | 691,143
Estimated Fair Value | 43,857 | 16,706
Not Designated as Hedging Instrument [Member] | Customer Counterparties Loan Lease Interest Rate Swaps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 122,788 | 496,887
Estimated Fair Value | (310) | (8,891)
Not Designated as Hedging Instrument [Member] | Customer Counterparties Loan Lease Interest Rate Caps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 107,835 | 122,791
Estimated Fair Value | $ (266) | $ (509)

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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