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Derivatives (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 6,822,497 |  | $ 6,010,689
Available for sale debt securities, Amortized Cost |  | 4,709,075 |  |
Fair Values, Liabilities |  | 38,311 |  | 11,953
Fair value liability |  | 5,300 |  | 5,700
Credit risk-related contingent features, net liability position |  | 40,000 |  | 12,900
Credit risk-related contingent features, posted collateral |  | 40,000 |  | 12,400
Other Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fair Values, Liabilities | [1] | 199,244 |  | 65,003
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | 1,654,900 |  | 1,659,400
Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fair Values, Liabilities | [1] | 23,453 |  | 2,105
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Amortization of accumulated other comprehensive loss on terminated cash flow hedges |  | 700 | $ 1,400 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 4, Expires 2021 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 50,000 |  |
Derivative maturity expiration year |  | 2021 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 1, Expires 2022 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 475,000 |  |
Derivative maturity expiration year |  | 2022 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 2, Expires 2023 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 550,000 |  |
Derivative maturity expiration year |  | 2023 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2024 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 100,000 |  |
Derivative maturity expiration year |  | 2024 |  |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 479,900 |  | 441,400
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Commercial Mortgage-Backed Securities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Available for sale debt securities, Amortized Cost |  | 473,200 |  |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Other Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fair Values, Liabilities | [1] | $ 23,453 |  | $ 1,759
[1] | Derivative assets and liabilities are reported at fair value in other assets or other liabilities, respectively, in the consolidated balance sheets.

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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