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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2020

Dec. 31, 2019

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

$ 6,822,497

$ 6,010,689

Fair Values, Assets

4

23

Less: netting adjustment, Assets

^[1],[2]

(63,742)

(27,056)

Fair Values, Liabilities

38,311

11,953

Less: netting adjustment, Liabilities

^[1],[2]

(149,835)

(43,914)

Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

230,611

81,502

Total derivative assets/liabilities

^[1]

166,869

54,446

Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Total derivative assets/liabilities

^[1]

49,409

21,089

Fair Values, Liabilities

^[1]

199,244

65,003

Derivatives Designated as Hedging Instruments [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

1,654,900

1,659,400

Derivatives Designated as Hedging Instruments [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

63,742

25,646

Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

23,453

2,105

Derivatives Not Designated as Hedging Instruments [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

5,167,597

4,351,289

Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

166,869

55,856

Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

175,791

62,898

Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

^[3]

4,284,812

3,759,232

Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1],[3]

161,835

54,512

Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1],[3]

165,934

55,664

Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

248,423

254,825

Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

72

21

Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

82

45

Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

278,632

145,623

Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

3,224

651

Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

404

744

Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

229,364

83,224

Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

319

369

Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

2,659

375

Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

83,094

64,632

Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

1,419

303

Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

1,367

366

Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

43,272

43,753

Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

5,345

5,704

Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

1,175,000

1,175,000

Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

63,742

24,172

Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

337

Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

479,900

441,400

Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] | Other Assets [Member]

Derivatives Fair Value [Line Items]

Fair Values, Assets

^[1]

1,474

Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

$ 23,453

1,759

Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Brokered Deposits [Member]

Derivatives Fair Value [Line Items]

Notional or Contractual Amount

43,000

Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Brokered Deposits [Member] | Other Liabilities [Member]

Derivatives Fair Value [Line Items]

Fair Values, Liabilities

^[1]

$ 9

[1]	Derivative assets and liabilities are reported at fair value in other assets or other liabilities, respectively, in the consolidated balance sheets.
[2]	Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.
[3]	The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions

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Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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