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Borrowed Funds (Narrative) (Detail) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 17, 2017 USD ($) | Feb. 28, 2007 USD ($) | Dec. 31, 2017 USD ($) quarter | Dec. 31, 2016 USD ($) | Dec. 31, 2004 USD ($)
Borrowed Funds [Line Items] |  |  |  |  |
Federal funds purchased |  |  | $ 30,600 | $ 13,700 |
Securities sold under agreements to repurchase |  |  | 1,117,200 | 963,300 |
Subordinated notes |  |  | 98,552 | 99,990 |
Junior subordinated deferrable interest debentures |  |  | $ 136,184 | $ 136,127 |
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures | quarter |  |  | 20 |  |
Trust II [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Maturity date |  |  |  |  | Mar. 01, 2034
Advances, variable-rate |  |  | 3.03% | 2.48% | 1.55%
LIBOR plus margin |  |  |  |  | Three-month LIBOR plus a margin of 1.55%
Proceeds from Issuance of Trust Preferred Securities |  |  | $ 120,000 | $ 120,000 | $ 120,000
WNB Capital Trust I [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Maturity date |  |  |  |  | Jul. 23, 2034
Advances, variable-rate |  |  | 3.71% | 3.23% | 2.35%
LIBOR plus margin |  |  |  |  | Three-month LIBOR plus a margin of 2.35%
Proceeds from Issuance of Trust Preferred Securities |  |  | $ 13,000 | $ 13,000 | $ 13,000
Federal Funds Purchased [Member] | Minimum [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Short term debt maturity period |  |  | 1 day |  |
Federal Funds Purchased [Member] | Maximum [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Short term debt maturity period |  |  | 90 days |  |
Securities Sold under Agreements to Repurchase [Member] | Minimum [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Short term debt maturity period |  |  | 30 days |  |
Securities Sold under Agreements to Repurchase [Member] | Maximum [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Short term debt maturity period |  |  | 90 days |  |
Subordinated Debt [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Subordinated notes | $ 100,000 | $ 100,000 |  |  |
Subordinated notes interest rate | 4.50% | 5.75% |  |  |
Maturity date | Mar. 17, 2027 | Feb. 15, 2017 |  |  |
Advances, variable-rate |  | 0.53% |  | 1.43% |
LIBOR plus margin |  | Three-month LIBOR plus a margin of 0.53% |  |  |
Unamortized debt issuance cost related to note |  |  | $ 1,400 |  |
Junior Subordinated Deferrable Interest Debenture [Member] | Trust II [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Unamortized debt issuance cost related to note |  |  | 931 | $ 1,000 |
Junior subordinated deferrable interest debentures |  |  | 123,700 | 123,700 | 123,700
Common equity securities |  |  |  |  | 3,700
Junior Subordinated Deferrable Interest Debenture [Member] | WNB Capital Trust I [Member] |  |  |  |  |
Borrowed Funds [Line Items] |  |  |  |  |
Junior subordinated deferrable interest debentures |  |  | $ 13,400 | $ 13,400 | 13,400
Common equity securities |  |  |  |  | $ 403

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- Definition The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 + Details
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