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Derivatives (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |
Notional amount of derivatives | $ 7,975,022 | $ 6,010,689
Derivative instrument associated loans on deferrals, receivable amount | 100 |
Fair value liability | 5,600 | 5,700
Credit risk-related contingent features, net liability position | 109,700 | 12,900
Credit risk-related contingent features, posted collateral | 44,700 | 12,400
Derivatives Designated as Hedging Instruments [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | 2,333,150 | 1,659,400
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 | 1,400 | 4,100
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 | $ 1,158,150 | $ 441,400
Derivative hedged item | 1,100,000 |
Basis adjustment associated with hedged items | 13,300 |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Derivative [Line Items] |  |
Amortized cost basis of closed portfolio of pre-payable securities | $ 1,200,000 |

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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=121590274&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=121590274&loc=SL5624258-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, in last-of-layer hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EEE -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109999718-113959 + Details
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