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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 | Sep. 30, 2018 | Dec. 31, 2017
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Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | $ 678,510 | $ 656,602
Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 670,568 | 647,571
Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 7,942 | 9,031
U.S. treasuries |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 17,555 | 13,830
U.S. treasuries | Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 17,555 | 13,830
U.S. treasuries | Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 0 | 0
Government agency issued MBS |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 319,760 | 430,186
Government agency issued MBS | Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 314,231 | 424,821
Government agency issued MBS | Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 5,529 | 5,365
Government agency issued CMO |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 51,966 | 57,703
Government agency issued CMO | Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 49,553 | 54,037
Government agency issued CMO | Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 2,413 | 3,666
Government guaranteed loans (SBA and USDA) |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 289,229 | 154,883
Government guaranteed loans (SBA and USDA) | Overnight and Continuous |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total Securities sold under agreements to repurchase | 289,229 | 154,883
Government guaranteed loans (SBA and USDA) | Up to 30 Days |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Total 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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