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Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Schedule of the Remaining Contractual Maturity by Collateral Type of Securities Sold Under Agreements To Repurchase (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | $ 764,308 | $ 762,592
Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 758,532 | 757,372
Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 5,776 | 5,220
U.S. treasuries |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 22,730 | 16,321
U.S. treasuries | Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 22,730 | 16,321
U.S. treasuries | Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 0 | 0
Government agency issued MBS |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 464,986 | 419,708
Government agency issued MBS | Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 459,210 | 414,488
Government agency issued MBS | Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 5,776 | 5,220
Other U.S. government agencies |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 23,477 | 36,688
Other U.S. government agencies | Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 23,477 | 36,688
Other U.S. government agencies | Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 0 | 0
Government guaranteed loans (SBA and USDA) |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 253,115 | 289,875
Government guaranteed loans (SBA and USDA) | Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | 253,115 | 289,875
Government guaranteed loans (SBA and USDA) | Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Securities sold under agreements to repurchase | $ 0 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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