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Note Borrowings (Federal funds purchased and repurchase Agreements) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | $ 300,116 | $ 390,921
Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 300,116 | 390,921
US Treasury Securities | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 272,252 | 279,373
US Treasury Securities | Within 30 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 93,129 | 148,516
US Treasury Securities | After 30 to 90 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 19,831 | 87,357
US Treasury Securities | After 90 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 159,292 | 43,500
Obligations of U.S. Government sponsored entities | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 6,055 | 66,056
Obligations of U.S. Government sponsored entities | Within 30 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 0 | 30,656
Obligations of U.S. Government sponsored entities | After 30 to 90 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 0 | 19,463
Obligations of U.S. Government sponsored entities | After 90 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 6,055 | 15,937
Mortgage Backed Securities | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 12,228 | 31,383
Mortgage Backed Securities | Within 30 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 12,228 | 31,383
Collateralized Mortgage Obligations | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | 9,581 | 14,109
Collateralized Mortgage Obligations | Within 30 days | Secured Debt |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Repurchase liability | $ 9,581 | $ 14,109

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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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